gold wash plant for sale

gold wash plant for sale

Using a gold wash plant, exposed gold-bearing gravels are mined using a bulldozer that pushes and stockpiles the gravel near a wash plant. The stockpiled gold-bearing gravel is then fed into the wash plant by a front-end loader or large backhoe. This practice promotes equipment efficiency by allowing the bulldozer to continue mining while the loader or backhoe feeds the wash plant at a steady rate. When the mined gravel is fed into the washplant. It is classified by particle size using various stationary or vibrating screens. Classifying gravels provides for more efficient gold recovery, reduced water consumption, and facilitation of mine site rehabilitation, and is practiced by most operators. The oversize material, usually larger than two inches, slides out of the washplant into a pile where it can be moved by a front-end loader or bulldozer. The undersize material and gold-bearing gravel is mixed with water and flows through the sluicebox where the gold and heavy black sands are concentrated. Tailings are gravel, sand, and other materials accumulated at the end of the sluicebox. Tailings are routinely moved away from the sluicebox by a loader or bulldozer.

The water that carries the gold-bearing gravel through the sluicebox becomes sediment-laden and turbid. This muddy process water flows from the end of the sluicebox over a pile of fresh tailings into a series of settling ponds. These ponds are designed to hold the muddy water long enough for the fine sediments to settle. The physical design of the ponds depends upon the amount of water flowing through the system, the sediment characteristics of the gravels being worked, and the physical characteristics of the site. Most mines use a series of small settling ponds to permit more flexible water management. Small ponds are usually easier to build, repair, dean, replace, bypass, and rehabilitate than larger ponds. The use of pre-settling ponds is encouraged. A pre-settling pond is located in the tail race between the sluice and the first settling pond. Sands and other heavy settleable solids are collected here where they are easy to wash.

However, some zero-discharge systems do have occasional discharges, usually due to water seepage through pond dikes. This seepage almost always meets the settleable solids effluent standards, and in most cases, Is probably of better quality than the water discharged from typically operated settling ponds. I.e., less settleable solids and lower turbidity. Carefully designed and Implemented water management practices are required to achieve zero discharge of muddy water into adjacent streams. Water used in the sluicing process Is pumped from the nearby stream through the washplant and into the settling ponds. Water Intake from the stream Is suspended when the ponds contain adequate water to support continued sluicing operations by recycling pond water to the washplant. In some cases, groundwater seepage Into the settling ponds may be sufficient to eliminate the need for adding stream water to the system. The practice of zero discharge and the recycling of mine water contributes to compliance with federal effluent limitations and State water quality standards.

Placer mining involves equipment ranging from a simple gold pan all the way up to trucks, excavators, and a gold wash plant.This type of gold prospecting usually involves less investment and will consistently yield small amounts of gold, with occasional bonanzas for those who are persistent. If you can learn to reliably return from every trip with decent concentrates, so that over time you fill a five-gallon bucket, and then maybe even a fifty-five-gallon drum, with black sands, magnetite, ilmenite, rare earth elements (REEs), and gold, you will be rewarded in the long run.

Either way, your long-term goals are your own.Very few prospectors are simply in it for the money, looking at this as a way to become a millionaire overnight. Some of us just like to get out of town, camp in the mountains, and enjoy the spirit of the outdoors. Some people like to work up a little sweat and appetite, improve their health, and learn a little. Some of us like to solve problems and run machinery, and enjoy the challenge of keeping a pump going or making sure the sluice is running right. Still others like the wildlife, the scenery, and the historical importance of the Wild West, and bring back their riches as photos and videos. In each case, if you toss in a little gold fever as motivation and stay scientific about your sampling and exploration, you will prosper far and above the value of your recovered material.

Still, a nice payday is always a treat. One sure way to reach that goal is to keep trying. Keep practicing, keep exploring, and keep getting out in the field. Another truism that seems to hold is that the farther away from civilization you get. the better your chances.

The development of a load/placer mine and the selection of the proper gravity recovery plant is more difficult than most people realize. Television shows have glamorized mining making it look like anybody can start a mine with little to no experience. What people dont realize is that mining is a structured engineering discipline taught at university. Just as you should not build your own bridge without knowledge of civil engineering, you should not think becoming a miner is a simple task. If you have no experience in the mining field you need to get educated about the process before you embark on this adventure. We have compiled a basic guide to assist in that process.

The terminology used for this type of mining is often interchanged. The term for the type of deposit under consideration is alluvial. Alluvial deposits are formed when the gold has migrated from its original deposition by weathering to a new location often inactive stream beds or in historic watercourses now overlain by sediments or glacial sediments.

In general Placer Mining is typically the recovery of gold from stream sediments through the use of dredges and sluices or other gravity means. Load mining generally involves the stripping of an overburden layer (soil) to uncover the underlying gravels that contain the gold. These deposits are often mined with mobile equipment and the ore trucked to a gravity treatment plant.

1. Permitting am I allowed to disturb the land excavating pits, leaving tailings behind, water usage, noise, air quality. In most cases you are not allowed to simply start mining even on your own land without the proper permits.

2. Resource estimation how much gold is present (grade and tonnage) and what does the deposit look like over burden depth, ore depth, gravel size. Generally, a placer resource is established by drilling or augering holes around the deposit to delineate the extent of the gold. This is often combined with field gravity recovery testing to provide an estimate of the recoverable grade.

6. Mine plan do you have a mine plan where are you going to mine first, where is the overburden going to be placed, where are the tailings going to be placed, is the plant going to be in one spot or moved during the mine life, what are the haulage distances. Is this a seasonal operation?

Mine Conditions Where is your project located? terrain, climate, infrastructure variables How large is your concession? Is a mobile or fixed plant right for this application? How many yards/hour (m/hr or tons per hour) do you want to process? How much water do you have available (GPM or m/hr)? Is there power available from the grid or do you required generation?

Plant Characteristics Are you looking for a mobile machine that you move regularly or a stationary plant that you haul your ore to? What type/size of equipment will you be feeding the plant with (front end loader, dredge pump, other)?

Feed Characteristics Ore consistency: What is the estimated maximum boulder size (in, mm)? Is there significant clay present? What is your maximum gold size (mm or um)? Is there fine gold present, what is the typical size (um)?

8. Economic Model Once you have made some initial assumptions you need to develop an economic model (even a basic one) so that you know if the project is viable before you start. No matter what type of project you should try and establish some basic economics unless this is just going to be a small hobby operation where profit does not matter. There are a lot of assumptions required to develop the model and you need to be realistic in your assessment. Add contingencies for operating costs of 10-15% and 20-30% for capital costs.

small and portable gold wash plant - jxsc machine

small and portable gold wash plant - jxsc machine

JXSCSmall andPortable gold wash plant with trommel, fullyCustomizable & moveable. Equip with the sluice box, gold centrifugal concentrator, shaker table, gold trommel, sand washing machine, vibrating feeders, vibrating screen, pumps, and the like portable mining equipment according to different conditions. CapacityCustomizable 1-300TPH Applicationdry land, beachside, stream, river gold mining, etc. Servicemining process flow design, quick machine selection and quotation, on-site installation, one year warranty.

DescriptionThe portable gold wash plant integrates ore mining and gold mineral processing operation, includes the excavation system, mineral processing equipment, water supply system, tailings treatment system, power supply, etc. TypeThe configuration of the mobile gold wash plant varies with the ore nature, processing capacity, site environment, and other factors. hard rock gold deposit, alluvial gold (placer gold) deposit; dryland placer gold, river gold (need gold dredger), river bed & beachside gold; contains sticky clay, sludge, gold trommel wash plant equipped with trommel scrubber, sand washing machine; Using bulldozer and excavator stockpiles the gold-bearing gravels near the gold mining wash plant, feeds gravels into the wash plant from feeding hopper (mount a vibrating screen to primary classify the gold-bearing gravels), the oversize material slides out, and the undersize material is mixed with water flow through the gold concentrator machines like gold centrifugal concentrator, portable shaker table, portable sluice box, tailings are discharged routinely. Portable gold wash plant manufacturerJXSC has been supplying gold mining equipment for large scale mining and small scale mining plant since 1985, develop deep cooperation relationships with gold mine companies in South Africa, Australia, Ghana, Russia, Congo, etc. Contact us to get the best gold wash plant price.

Portable gold mining equipment and process flow 1. Feeding: dredge pump, hopper feeder with vibrating grizzly bar. 2. Washing and screening: usually use rotary scrubber, gold trommel, sand washing machine, vibrating screen, etc. 3. Beneficiation: gold centrifugal concentrator, shaker table, sluice box, mineral jig. 4. Water supply 5. Tailings 6. Mobile System: Composed of chassis and traction steering two major components, 4 axes 16 tires, 4 mechanical legs support centrifuge, can be turned in situ 180 degrees, easy to move to the workplace. Working principle1. Dry gold mining Dry land mobile gold wash plant with rubble tyre, easy to move on, can separate placer gold from ancient river, dry beach sand. Dryland gold mining usually use trommel screen combines the small gold jig and gold sluice box into a single mobile gold recovery plant to process placer gold, monomer lode gold. This type of small scale gold wash plants has a light weight, easy to maintain, low cost. 2. River gold mining The river gold panning equipment, mostly as the gold dredging ship floating on the water, it is a multifunctional placer mining equipment that combines excavation, ore washing, beneficiation, tailings disposal, and power supply, water supply. River gold dredger can work at stream, river, offshore, beach side, etc. But as for small gold wash plant, the cost of the gold dredger may be a huge part. How to build a small gold wash plant? Using dredge pump pumping the river bed fine sand to the near land portable gold trommel, wash and classify the undersize material to gold centrifugal concentrator and shaker table.

gold wash plant prices | cost of a m300 wash plant & more

gold wash plant prices | cost of a m300 wash plant & more

We offer consulting services and can help you decide the viability of your potential site and what mining equipment is right for you. Our gold wash plant prices are set based on the intensity of usage at these sites.

our blog | stay up to date on our gold mining news | gold watch project

our blog | stay up to date on our gold mining news | gold watch project

First, when using a vibrating screen gold wash plant you must make sure your bolts are tight. The majority of the bolts on our machines are 3/4" grade 8. We only use premium grade 8 hardware on our wash plants which require a torque spec to 282 ft/lbs. These are top lock nuts on lock washers which offer the best security when high vibration is occurring.

Second, Make sure the bearings are greased daily. Due to the extreme environment, your wash plant is in, it is important to only use bearings that are able to be greased. No sealed bearings on our wash plants. Only 100% easy to access, serviceable, American made bearings are in use on our wash plants.

Third, our wash plants are all direct hydraulic drive. No belts, transmissions or generators are required to run the wash plant. All gold watch project gold wash plants are self-contained direct drive hydraulically driven wash plants which means less maintenance or chance of equipment failure on your mining site. But you will need to change the hydraulic oil and engine oils. This timing will depend on which model you have and what environment you mine in.

As an engineer for GWP, Ive had the opportunity to work at numerous placer mining operations around the world. Some succeeded, and some failed. Some had their equipment seized by hostile government agencies. Some were unable to establish an economical supply chain due to inadequate infrastructure, Ebola, and a civil war. Meanwhile, some seemed to do everything right. However, the vast majority of failures were the result of a single issue: inadequate and inaccurate sampling.

gold mining wash plant examples | m200t wash plant & more

gold mining wash plant examples | m200t wash plant & more

Here at Gold Watch Project, we offer a wide variety of different gold mining wash plants. Before you purchase one, however, you might want to know how these different machines work. After all, different machines will better serve different situations. Therefore, weve prepared some demonstrations of our gold mining wash plants in order to give you an idea of how they work. We have two different machines available for demonstration: our Medium Wash Plant M50 and our M200T Wash Plant. These two machines are among our most popular offerings, and the videos demonstrate how to use them and how they work. Watch a few of our videos to learn more about our products and to get a look at them in action.

portable wash plant | small gold wash plant | gold mining equipment | dove

portable wash plant | small gold wash plant | gold mining equipment | dove

DOVE Equipment & Machinery Co., Ltd. is the worlds largest manufacturer of Portable Wash Plants, with over 50 years manufacturing expertise, was the pioneer in designing and introducing the first generation of Portable Wash Plants to the mining industry.

DOVE Portable Wash Plants (EXPLORERandSUPERMINER Alluvial Portable Processing Plants) are designed and configured as a complete and fully integrated processing line for the automatic and simultaneous classification, concentration and recovery of Gold, Diamonds, Gemstones, Base Metals, and Ferrous Metals, Light Metals from Alluvial (Placer) Deposits.

DOVE is a leader and powerhouse in the mining equipment manufacturing industry, producing the largest range of Portable Wash Plants (EXPLORER and SUPERMINER) configured in various specifications and supplied for exploration, small, medium and large-scale mining operations, with the capacity to handle material ranging as below:

Portable wash plants are also known as Portable Alluvial Wash Plants, Portable Placer Wash Plants, Portable Alluvial Processing Plants, Portable Placer Processing Plants or Portable Trommel Wash Plants.

Different machines that are configured as components of the Portable Wash Plant will achieve these crucial steps. Skipping any of the crucial steps will result in lack of recovery or loss of the valuable minerals.

Gravity separation, also known as Gravity Concentration, is one of the oldest recovery methods in the mining and has been used as a primary form of mineral concentration for centuries. Gravity separation has been tested and approved as one of the best techniques for the concentration of free flowing minerals.

In a Gravity Separation process, the metals and minerals are subjected to forces in a medium, such as water, air, or other heavy medium. The response of the minerals and metals to these forces can be enhanced resistance or settling velocity, depending on their specific gravity, which will allow for the separation to occur. This way, valuable minerals and the gangue can be separated from one another due to their difference in specific gravity and response to the various forces in the medium.

By using Gravity Separation, DOVE Portable Wash Plants eliminate the costs involved in crushing and grinding of the material, and also reduce the slime losses that usually result from unnecessary and abusive size reduction operations.

In a DOVE Portable Wash Plant, every component is crucial for the efficient operation of the Wash Plant and proper processing the ore and high recovery of Gold, Diamonds and other minerals production. DOVEs unique designs are embedded in each of the Portable Wash Plants components to insure the efficient recovery of 100% of the Gold Production, with no loss.

is a big hopper designed to feed the Ore to the rest of the wash plant. This hopper can be a wet or dry type depending on the projects requirements. The hopper is designed to be fed with earth moving equipment, such as Excavators, Loaders, Dump Truck, or gravel pump, and conveyor belt, with respect to the plant capacity (Tons Per Hour) solids.

DOVE Ore Feed Hoppers have a durable structure built with heavy cage of steel 5-12 mm to ensure that they stand the severe conditions of the mining site. In addition, they are designed to be easily connected to high-pressure Hydraulic spray-Jets system, Hydraulic Manifold and piping system. Their slurry ore outlet is designed to easily connect to the Static or Vibrating Grizzly.

is a powerful Hydraulic Canon that sprays highly pressurized water and is used to effectively break the clay contained in the ore at early feeding stage. The canons are used in wet ore feeding system and when the Ore has high clay content. Additionally, they offer assistance with the logistics of the Ore, in the form of Slurry, into the Ore Channels and to the next processing stage.

DOVE Monitors are built with casted hardened steel (high carbon) and have a bronze or hardened steel head. To ensure that they can be operated during long hours under extreme weather conditions, the DOVE Monitors are supplied with an Operator Cabin Stand Structure. DOVE Monitors are durable and designed to operate using recycled water in the mining site.

is designed to rapidly transport of ore using gravity, in its slurry form, from one stage to another such as from the screening stage to the classification stage, and throughout the Portable Wash Plant.

DOVE Ore Feed Channels are exclusively designed with clay breaking Hydraulic network and High Pressure Spray Jet system. DOVE Ore Feed Channels are built in various dimensions according to the processing capacity and to the ore logistics volume requirements of the wash plant, as well as the specific ore characteristics and site conditions

In order to eliminate the friction and wear of the steel channel, DOVE Ore Feed Channels are exclusively Rubber lined. The rubber lining also speeds up the logistics of slurry Ore and eliminates clogging of the channel by transiting solid. These unique and unparalleled features make DOVE Wash Plants the number one desired solution for every mining company.

Screening is the action of separating the materials according to their size by simply passing them through a screen or a number of screens, which can be in motion or static. Screening can be done in multiple stages to achieve higher efficiency.

come in various sizes and are used for the first screening stage of DOVE Portable Wash Plants. Grizzly Separators are designed to screen the large oversized rock particles from the ore, prior to being transported, through slurry channels (wet feed) or belt conveyors (dry feed), to the next stage of classification. The screen mesh sizes are specifically chosen according to the ore characteristics and project specifications.

The rapid elimination of the large unwanted rocks by the Grizzly Separators an essential step, which will prevent the large rocks from going to the Classification and concentration stages. This means that only the mineral baring ore is processed throughout the next stages of the Portable wash plant, hence, reducing the amount of material that needs to be processed and eliminating damages that could be caused by the rocks on the long run.

Configured with High Pressure Spray Jet module and complete Hydraulic Net work, DOVE Grizzly Separators are designed to break the clay sticking to the rock particles. This eliminates the risk of losing the precious minerals that might stick to the oversized rocks due to the clay.

is, essentially, a large cylindrical screen, installed on a supporting base in a slightly inclined position, which spins in order to classify the material that is being introduced through its feeding end.

The Trommel is designed to perform classification of the ore, as well as breaking valuable minerals free from the host clay and is a major component of a Portable Wash plant. After being freed from the host clay, the materials are classified according to their size, hence reducing the volume of material that will be processed in the next stages and increasing the recovery process efficiency.

DOVE Trommels are uniquely designed with features that are unparalleled in the mining industry. DOVE Trommel is supplied with various capacities and models and basically divide into various categories and models:

DOVE Trommel Classifiers with their special designs are integrated in DOVE Portable Wash plants, in accordance to the Ore specifications, and Portable Wash Plant requirements. All DOVE Trommels are offered with Trommel Feed Hopper , Hopper Hydraulic Clay breaker network, Trommel Security Covers, 3-way Engine/Motor security Canopy and locking mechanism, High pressure main Hydraulic Spray Jet system, Clay Breaker module, Diesel Engine or Electric Motor, Geared speed reduction, Wheel Set Trailer, Hitch Mechanism, Under size Rubber lined Feed Channel, Manifold- Hydraulic Piping Network, and Trommel Height adjustment mechanism.

areGravity Concentration devices designed and mainly used in mineral processing for washing, separation and concentration of coarse metals & minerals within the ore, based on their specific gravity. These concentrators subject the particles within the ore to a jigging motion in water, which enhances their settling velocity with respect to their specific gravity, while separating them over a selected screen mesh size.

Jig Concentrators are widely used in the mining industry to recover various metals and minerals given the high specific gravity differential of material makes recovery possible. Jig Concentrators are the most important and essential devices in mineral recovery because of their unique ability to absorb fluctuations in ore grades, tonnage rates and dilution, all without any effect on recovery results.

DOVE Jig Concentrators are produced in several categories and models, and are integrated in DOVE Portable Wash Plants based on the Type of the wash plant, its specific application, type and specification of Minerals to be concentrated and recovered.

DOVE Jigs are designed with unique features, which are unparalleled in the industry. You will find DOVE Jigs in practically every country on the African Continent, in South East Asia, in Brazil, in Columbia and in Guyana.

DOVE Jigs are available with Automatic Production Removal Module, Manifold and complete internal Hydraulic Network, Security System to prevent unauthorized access to the production preventing the theft of production, Stand Structure, Jig Balance and Stands Height Adjustment System, Engine/Motor 3-Way Security Canopy, Speed Gear Adjustment mechanism, Jig Feed Hopper, High Pressure Spray Jet to Assist Uniform flow of Slurry Ore, Trailer Wheel-Set, Hitch Mechanism, and Tool Box containing Tools for Maintenance.

They are used in mining projects that require recovery method of fine particles of free flowing gold other than Cyanide, or other toxic chemicals, due to environmental concerns, Government regulations or the High Cost of Cyanide and other toxic chemicals for gold recovery Process.

DOVE Gold Centrifugal Concentrators haveadvanced features and design. DOVE Centrifugal Concentrators utilize the enhanced gravitational force (G-Force) of the particle to optimize separation capabilities and to efficiently recover fine gold and other heavy minerals particles.

Additionally, to efficiently process and to nearly recover 100% of every fine-sized particles of gold, down to 40 microns (0.004 mm), DOVE Centrifugal Concentrators only require surface recycled water.

DOVE Centrifugal Concentrators are supplied with locking mechanism, Complete Hydraulic System and high pressure multistage water pumps, Ore feed Module including slurry pump and sump tank for feed monitoring, hydrocyclone and rubber fish tail as concentrate moisture adjustment mechanism and to monitor the flow of solid particles and to prevent freezing conditions.

are designed and patented by DOVE for simultaneous concentration and recovery of fine particles production of various metals and minerals, such as precious metals, base metals, ferrous metals, Diamonds and Gemstones.

VBS Concentrators are effectively used for the efficient washing, classification and concentration of fine metal and mineral production from the ores in Alluvial (Placer) deposits, such as Precious Metals, Precious and Semi-Precious Stones, Base Metals, Ferrous and Non-Ferrous Metals, Noble Metals, Heavy Metals.

Concentrating Tables are agreed by all to be the most effective and selective machines for wet Gravity Separation. They are used to effectively separate minerals from one another, even when each minerals specific gravity is close in value to that of others in the ore.

DOVE Concentrating Tables are composed of wooden or aluminum decks, that can have either have a rectangular or diagonal shape, with ultra-smooth rubber cover and riffle surface or are operating in horizontal plane, where material with higher specific gravity is separated from material with lower specific gravity.

The Head Motion applies a reciprocating movement to the tables deck in a horizontal plane and as the material moves across the table, the shaking motion of the deck causes size classification and specific gravity stratification.

The flow of water crossing the deck causes shear in the stratified material and forces it to stream over the rifle surface of the tables deck. The material of lower specific gravity continues to float near the water surface and spills over the riffles, towards discharge end of the table. Material higher specific gravity is held back by the riffles, near to the tables surface, and moves along the tables deck to the concentrate discharge.

WE HIGHLY RECOMMEND FORWARDING SOIL SAMPLES OF YOUR MINE TO US FOR ANALYSIS, IN ORDER TO DESIGN AND RECOMMEND THE MOST EFFICIENT PROCESSING PLANT, TAILOR MAID TO YOUR MINE REQUIREMENTS, FOR HIGHEST PRODUCTION RECOVERY.

DOVE laboratory will assay your ore samples rapidly and analyze your raw materials and recommend the most efficient processing plant according to the ore specifications, minerals composition, and ore assay results, and your project size and the geologic and topographic conditions of your mine.

about gold wash plant | custom gold wash plants

about gold wash plant | custom gold wash plants

Our passion is making great machines. Our gold wash plants are efficient and powerful. Efficient power means more money in your pocket. All machines use Premium Rexnord bearings on the shaker system that come equipped with grease points that will assist with years of use. Each machine is highly portable, and most can be mounted on trailers for even more portability.

Clay is every miners enemy no matter what type machine you use. Clay will cut production down significantly, and results will vary depending on your clay content. Our engineers work closely with customers to tailor the machines to the customers needs as best as possible.

Clean outs range from 30 minutes to about 90 minutes.Our riffle system is modular and each section is held down by two 3/4 nuts which easily detach to reveal the miners moss matting below. From there remove the matting, clean, and replace. Some customers purchase extra mats so the clean out goes even faster.

The 50 ton wash plant is ready to start recovering gold when it arrives. It comes equipped with hydraulic unit, water pump, and 300 of high pressure lay flat hose. Due to shipping regulations it ships dry and fluids will need to be added on site.

The wash plant is designed to be highly portable and can be moved from site to site by dragging along the heavy duty skids. From there setup is quick, just hook up the water, level the sluice boxes, and start mining.You can see in our examples how the wash plant is dragged around.

gold wash plants for sale - mining & construction solutions from henan dewo machinery

gold wash plants for sale - mining & construction solutions from henan dewo machinery

Dewo machinery can provides complete set of crushing and screening line, including Hydraulic Cone Crusher, Jaw Crusher, Impact Crusher, Vertical Shaft Impact Crusher (Sand Making Machine), fixed and movable rock crushing line, but also provides turnkey project for cement production line, ore beneficiation production line and drying production line. Dewo Machinery can provide high quality products, as well as customized optimized technical proposal and one station after- sales service.

Gold Wash Plant Prices Purchase Your Gold Wash Plant Today. Our custom gold wash plants are available for purchase. Take a look at our gold wash plant prices and feel free to reach out to us with questions.

The Mini Gold Trommel Wash Plant is an easily portable Gold Wash Plant that can be towed by an ATV, and can be broken down to its major components in under 1 minute. Complete with 2-stage 60" x 10" Sluice box this Trommel features excellent gold recovery.

10-Pay less money and recover more gold than other machines. 8-One-stop gold wash plants with Turn-key operations. 9-Stationary or mobile type up to your choice . 1/5 Zhuomiao gold trommel for sale small mini 1-5t per hor iso9001 1 year gravity separator new

The mini gold wash plant machines up for sale are from the leading sellers and trusted manufacturers who assure outstanding quality and steady performance for a long time. These motor-operated mini gold wash plant machines are available in various distinct models and their capacities may vary for each.

Trusted Industry Leader. MSI has a Large selection of Gold Mining Equipment or Gold Recovery Equipment with Gold Machine like Gold Trommel, Gold Wash Plant, Sluice Box, Gold Shaking Table, Portable Gold Trommel, Portable Gold Wash Plant, Gold Concentrator, Gold Dredge, Gold Jig, Duplex Jig, Grizzly Feeder, Conveyor, Gold Enhancer our well known Monster Red and Big Red, and all chemical free ...

Minequips gold mining equipment rotary trommel wash plants are manufactured for commercial use in small to medium sized gold recovery operations, and our gold mining equipment is used successfully in production gold mines in New Zealand, Mongolia, Papua New Guinea, Bolivia, Ghana and Cameroon.

Dewo machinery can provides complete set of crushing and screening line, including Hydraulic Cone Crusher, Jaw Crusher, Impact Crusher, Vertical Shaft Impact Crusher (Sand Making Machine), fixed and movable rock crushing line, but also provides turnkey project for cement production line, ore beneficiation production line and drying production line.

explorer portable plants | portable wash plants | dove

explorer portable plants | portable wash plants | dove

Potable Wash Plants, also known as Portable Gold Wash Plants, Portable Diamond Wash Plants, Small Gold Wash Plant, Portable Gold Mining Equipment, Portable Gold Mining Wash Plants, Small Gold Mining Equipment, or Portable Gold Trommel Wash Plants

The EXPLORERPortable Processing Plants are Portable Wash Plants exclusively designed, patented and developed by DOVE, for surface mining in exploration, pilot and small scale mining operations of alluvial Gold, alluvial Diamond, Gemstones, base metals metals and ferrous metals.

EXPLORERPortable Plants are configured and customized with multy-stage classifier and concentrators according to the ore specification as a fully integrated processing plant for 100% recovery of gold, diamonds, base metals, ferrous metals, with no loss.

EXPLORER Portable Plants are easily assembled, disassembled, installed and transported through the mining site, resulting in rapid deployment on the site. Plants are fully portable to allow ease of movement in the field.

EXPLORER Portable Plants offer features such as the ability to easily be operated and maintained on the site, and dont require much human interference during the processing of the minerals, offering a user-friendly experience for the operator.

EXPLORER Portable Plants can be tailor made according to the mine specifications and customized to be integrated with various portable equipment in order to form a complete production line for the full recovery of minerals.

EXPLORER Alluvial Gold Processing Plants are configured with our special Multi-Stage Classification Trommels, which enables the plant to achieve up to three (3) sizes classification simultaneously as well as resolving the Heavy Clay content concern, Duplex Jig Concentrators and DOVE Centrifugal Gold Concentrators, which will ensure that the processing of the ore will capture both gold nuggets and fine gold with no loss, down to 40 microns (0.040mm), with 100% recovery.

EXPLORER Alluvial Diamond Processing Plants are configured with our Trommels Classifier Screens/Scrubber Screens, which enables the plant to thoroughly wash the ore and break the host clay if necessary, Duplex Primary and Secondary Jig Concentrators, and Scavenger Jig Modules for the simultaneous processing, concentration and separation of coarse and fine diamonds, with 100% recovery.

EXPLORER Alluvial Gold and Diamond Processing Plants are configured with our special Multi-Stage Classification Trommels, which enables the plant to achieve up to three (3) sizes classification simultaneously as well as resolving the Heavy Clay content concern and liberate the gold and diamond from the host clay, Duplex Primary and secondary Jig Concentrators for the recovery of gold nuggets and coarse diamond particles, Scavenger Jig Modules for the recovery of fine Diamond Particles, and DOVE Centrifugal Gold Concentrators for the recovery of fine gold. The plants are designed to achieve 100% recovery of Gold and Diamonds particle, down to 40 microns (0.040mm), with no loss.

DOVE laboratory will assay your ore samples rapidly and analyze your raw materials and recommend the most efficient processing plant according to the ore specifications, minerals composition, and ore assay results, and your project size and the geologic and topographic conditions of your mine.

WE HIGHLY RECOMMEND FORWARDING SOIL SAMPLES OF YOUR MINE TO US FOR ANALYSIS, IN ORDER TO DESIGN AND RECOMMEND THE MOST EFFICIENT PROCESSING PLANT, TAILOR MAID TO YOUR MINE REQUIREMENTS, FOR HIGHEST PRODUCTION RECOVERY.

portable gold wash plant | gold mining equipment | dove

portable gold wash plant | gold mining equipment | dove

TheEXPLORERandSUPERMINERGOLD Processing Plantsare Portable Gold Wash Plantsexclusively designed, patented and developed by DOVE,for surface mining in exploration and pilot mining operations, as well as small, medium and large scale mining operations, of alluvial Gold(Placer Gold).DOVE also produces Portable Gold Wash Plants designed for specific mining areas,where Diamonds and/or other minerals exist together with Alluvial Gold. These wash plants recover Gold, Diamonds, and other minerals, simultaneously, with no loss of production.

DOVEEquipment & Machinery Co., Ltd. is a leader and powerhouse in the mining equipment manufacturing industry, producing the largest range of Portable Gold Wash Plants (Portable Gold Processing Plants) for small, medium and large scale mining operations, with the capacity to handle material ranging as below:

EXPLORERPortable Alluvial Gold Processing Plants (Portable Gold Wash Plants) for mining Alluvial (Placer) gold are produced in 6 models, with capacity ranging from 2-60 Tons/Hour solids (8-240 m3/Hour slurry).

SUPERMINERPortable Alluvial Gold Processing Plants (Portable Gold Wash Plants) for mining Alluvial (Placer) gold are produced in 3 models, with capacity ranging from 80-170 Tons/Hour solids (320-680 m3/Hour slurry).

Potable Gold wash plants are also known as Portable Alluvial Gold Wash Plants, Portable Placer Gold Wash Plants, Portable Alluvial Gold Processing Plants, Portable Placer Gold Processing Plants or Portable Gold Trommel Wash Plants.

DOVEPortable Gold Wash Plantsare the most advanced processing plants in the mining industry, with unique features, and most efficient recovery ratio. They are economical withhighest and fastest return of investment. With over 5 decades in fabrication, DOVE Portable Gold Wash Plants were supplied in every country in Africa and South-East Asia, Columbia, Brazil, and Guyana.

These crucial steps are achieved by different machine components in a Portable Gold Wash Plant configuration. Any short cut of the crucial steps shall result in lack or reduction of recovery of the Gold Production or loss of the Gold Production.

Gravity separation, or Gravity Concentration, is one of the oldest proven recovery methods in the history of gold mining. It has been tested and approved as a technique of concentration of free flowing gold and has been used as a primary system for concentration and recovery of gold.

The Gravity separation method consists in separating minerals or metals from one another using their difference in specific gravity and of their relative response to other forces they are subjected to.

In Portable Gold Wash Plant, using Gravity Separation process, the gold particles are subjected to forces in a medium, such as water. The response of the gold particles to these forces shall enhanced resistance or accelerated settling time, depending on their specific gravity, which will allow for the separation to occur. In this way, gold particles with specific gravity of (S. G. 19.32) and the gangue can be separated from one another due to their difference in specific gravity and response to the various forces in the water.

By using Gravity Separation, DOVE Portable Gold Wash Plants reduce the costs involved in crushing and grinding of the material, and also reduce the slime losses that usually result from unnecessary and abusive size reduction operations.

In a DOVE Portable Gold Wash Plant, every component is crucial for efficient operations and proper processing the Gold Ore, which are important to achieve high recovery of the Gold Production. DOVEs unique designs are embedded in each of the Portable Gold Wash Plants components to insure the efficient recovery of 100% of the Gold Production, with no loss of production.

is a large hopper designed to feed the Ore to the rest of the wash plant. This hopper can be a wet or dry type depending on the projects requirements. The hopper is designed to be fed with earth moving equipment, such as conveyors, gravel pumps, Excavators, Loaders or Dump Truck, with respect to the plant capacity (Tons Per Hour) solids.

DOVE Ore Feed Hoppersare supplied in different capacities, and specifications, designed and engineered as interconnecting components for easy and rapid assembly, installation and rapid disassembly at mining site.

DOVE Ore Feed Hoppersare fabricated with heavy cage of steel plates of 5-12 mm, to insure their durability and to stand severe conditions of the mining site. Additionally, they are designed to be easily connected to high-pressure Hydraulic spray-Jets system, Hydraulic Manifold and piping system. Their slurry outlet is configured in different sizes for ease of connection to the Static or Vibrating Grizzly.

is a powerful Canon that produces high pressure water Jet Spray, used to break the clay contain of the Ore at early stage of feeding, as well as assist in speedy ore throughput. The canons are highly effective in wet ore feeding system and when the ore has high clay content. They assist with the logistics of the Ore, in the form of Slurry, into the Ore Feed Channels and to the next step of operation.

DOVE Monitorsare casted in hardened steel (high carbon) and have a bronze or hardened steel head. They are supplied with an Operator Cabin Stand Structure, designed for long hours of operations under extreme weather conditions. DOVE Monitors are rugged and designed to operate using recycled water in the mining site.

is designed for the rapid and economical transportation of the slurry ore from one stage to another, such as from the screening stage to the classification stage, and also used through out the gold wash plant mainly for the transportation of slurry ore using gravity force.

DOVE Ore Feed Channelsare exclusively designed with high pressure clay breaker Hydraulic network and High Pressure Spray Jet system. DOVE Ore Feed Channels are fabricated in various dimensions in accordance with the processing capacity of the Wash Plant, ore logistics volume requirements of the wash plant, specific ore characteristics and specific site conditions.

DOVE Ore Feed Channels are exclusively rubber lined, in order to eliminate the friction and wear of the steel channel, as well as to speedup the logistics of slurry 0re, and eliminate clogging of solid particles in the channel. These unique andunparalleled features make DOVE Wash Plants the number one desired solution for every mining company.

Screening is the process of separating the material according to their size by simply passing it through a screen or various sizes of screens, which can be vibrating or static. Screening can be done in multiple stages to achieve higher efficiency.

are screens of various sizes used for the first screening stage in DOVE Portable Gold Wash Plants. Grizzly Separators are designed to screen the large oversized rock particles from the ore, prior to the next stage of ore transportation, through slurry channels (wet feed) or belt conveyors (dry feed), and classification. The screen mesh sizes are chosen in accordance with the ore characteristics and project specifications.

This component is important, since it rapidly eliminates the large unwanted rocks to avoid them going to the classification and concentration stages. This means that only the mineral bearing ore is processed throughout the next stages of the wash plant, hence, reducing the amount of material that needs to be processed.

DOVE Grizzly Separators are configured with High Pressure Spray Jet Module and complete Hydraulic Network, designed to break the clay sticking to the rock particles and eliminate the risk of losing the precious minerals that might stick to the oversized rocks due to the clay.

A Trommel Classifier is large revolving cylindrical screens installed on a supporting base, in a slightly inclined position. Trommel is powered by electric motor or diesel engine, or in some cases by hydraulic power. The Trommels cylindrical screen spins in order to sort through the material that is being introduced through its feeding end.

The Trommel is a major component of a Portable Wash plant, designed to perform classification of the ore, as well as breaking valuable minerals free from the host clay. Once freed from the host clay, the materials are also classified according to their sizes, reducing the volume of material that will be processed in the next stages for increased efficiency of the recovery process.

All DOVE Multi-Stage Classification Trommels are offered with Trommel Feed Hopper, Hopper Hydraulic Clay Breaking Network, Security Covers, 3-way Engine/Motor Security Canopy and Locking Mechanism, High Pressure Main Hydraulic Spray Jet System, Clay Breaking Module or Scrubber Module, Diesel Engine or Electric Motor, Geared Speed Reduction, Wheel Set Trailer, Hitch Mechanism, Undersize Rubber Lined Feed Channel, Feed Channel Rubber Lined for Coarse Material, Water Manifold and Hydraulic Piping Network, and Height Adjustment Mechanism and optional Conveyor assembly for reject.

Jig Concentrators are Gravity Concentration devices designed and mainly used in mineral processing for washing, separation and concentration of coarse metals & minerals within theore, based on their specific gravity. These concentrators subject the particles within the ore to a jigging motion in the medium of water, which accelerates their settling time with respect to their specific gravity, while separating them over a selected screen mesh size.

Since the high specific gravity differential of material makes recovery possible, the use ofJig Concentratorsto recover various metals and minerals is wide within the mining industry.Jig Concentratorsunique ability to absorb fluctuations in ore grades, tonnage rates and dilution, without any effect on recovery results, makes them the most important and essential devices in mineral recovery.

DOVE Jigsare designed with unique features, which are unparalleled in the industry. You will find DOVE Jigs in practically every country on the African Continent, in South East Asia, in Brazil, in Colombia and in Guyana.

DOVE Jigs for Portable Gold Wash Plants are available with optional Automatic Production Removal Module, Manifold and complete internal Hydraulic Network, Security System to prevent unauthorized access to the production preventing the theft of production, Stand Structure, Jig Balance and Stands Height Adjustment Mechanism, Engine/Motor 3-Way Security Canopy, Speed Gear Adjustment Mechanism, Jig Feed Hopper, High Pressure Spray Jet to assist uniform flow of slurry ore, Trailer Wheel-Set, Hitch Mechanism, and Tool Box containing tools for maintenance.

They are used for the recovery of fine particles of free gold for mining projects that do not used cyanide or other toxic chemicals due to environmental concerns, government regulations or the high cost of cyanide and other toxic chemicals for gold recovery process.

DOVE Gold Centrifugal Concentratorshasadvanced features and design. DOVE Gold Centrifugal Concentrators utilize G-Force to efficiently recover fine gold particles by enhancing the gravitational force to optimize separation capabilities.

DOVE Gold Concentrators are supplied with security system and locking mechanism, complete hydraulic system and high pressure multi-stage water pumps, ore feed module including slurry pump and sump tank for feed monitoring, hydrocyclone and rubber fish tail as concentrate moisture adjustment mechanism and to control solid flow.

Gold Concentrating Tables are known as one of the most effective and selective machines for wet Gravity Separation. They have the unique ability to separate minerals with fairly close specific gravity values from each other, which is nearly impossible to achieve with other equipment designed for wet Gravity Separation.

DOVE Gold Concentrating Tablesare comprised of wooden decks with ultra-smooth rubber cover and riffle surface and are operating in horizontal plane, where material with higher specific gravity is separated from material with lower specific gravity.

Head Motion imparts a reciprocating movement to the tables deck in a horizontal plane. As the material moves across the table, the shaking action of the deck causes size classification and specific gravity stratification.

The flow of cross water causes shearing of stratified material and forces it to cascade over the riffle surface of the tables deck. Lower specific gravity material remains close to the water surface and rides over the riffles towards discharge end of the table; higher specific gravity material is being hold back by the riffles, which is closest to the tables surface, and moving along the tables deck to the concentrate discharge.

Smelting is the process of refining an ore. The ore is subjected to high temperatures that will melt it, resulting in a chemical change of the ore that allows for the metals to be converted into a purer form.

In the Portable Gold Wash Plant, the Smelting Furnace is used after the Gold Concentrating Table, to remove the unwanted impurities while melting the Gold. The result will be a melted gold and a slag that are separated from each other due to their difference in melting point and density. The slag can easily be removed and the melted gold will be molded into Gold Dore Bars.

DOVE Smelting Furnace is supplied with Hard Burned Crucibles where the material can be safely melted at high temperature, Quartz Rods to stir the melted alloy, Tongs to safely garb crucibles over the high temperature in the furnace, Sliding Ingot Mold for the creation of Gold Dore Bars, and Stamping Tools to mark the dore bars with the desired initials and serial numbers.

Additionally, DOVE Smelting Furnace is supplied with equipment that aim to keep the user safe during the furnace operation, including High Chemical and Heat Resistant Protection masks to prevent the users from inhaling any hazardous particles, Chemical and Heat Resistant Clothes that are made of leather and Chemical and Heat Resistant Apron that aim to protect the users hands and body from the dangers of the chemicals extreme temperatures exposure, and Safety Goggles to protect the eyes from being struck of chemicals and hazardous particles during the operations.

WE HIGHLY RECOMMEND FORWARDING SOIL SAMPLES OF YOUR MINE TO US FOR ANALYSIS, IN ORDER TO DESIGN AND RECOMMEND THE MOST EFFICIENT PROCESSING PLANT, TAILOR MAID TO YOUR MINE REQUIREMENTS, FOR HIGHEST PRODUCTION RECOVERY.

DOVE laboratory will assay your ore samples rapidly and analyze your raw materials and recommend the most efficient processing plant according to the ore specifications, minerals composition, and ore assay results, and your project size and the geologic and topographic conditions of your mine.

minequip nz rotary gold trommel wash plant manufacturer

minequip nz rotary gold trommel wash plant manufacturer

Minequips gold mining equipment rotary trommel wash plants are manufactured for commercial use in small to medium sized gold recovery operations, and our gold mining equipment is used successfully in production gold mines in New Zealand, Mongolia, Papua New Guinea, Bolivia, Ghana and Cameroon.Based on the West Coast of New Zealands South Island, Minequip knows mining after all, the gold rushes started here back in 1865. Those first pioneers have passed down their knowledge of gold mining equipment through the generations and our design engineers have over 60 years combinedexperiencein the gold mining equipment engineering industry.

Minequip New Zealand manufactures commercial scale gold mining equipment rotary trommel wash plants directly for sale. Ourgold mining equipment is built towithstand the demands of small to medium production gold mining operations.

We know the high demands placed on commercial gold rotary trommel wash plant equipment, and build our gold mining equipment to withstand the harsh conditions of a production gold mine,withefficiency and durablility the key ingredients in every manufactured processing plant.

derocker for sale

derocker for sale

Ground sluicing utilises the erosive power of flowing streams of water in open channels to process material broken by hand and is one of the oldest methods of mining. Conventional practice is to construct a dam across the watercourse above the section to be mined and to channel the water along flumes cut into the pay gravels. Material shovelled in from the sides is broken up and slurried manually to release the values. The gold is recovered behind riffles in wooden sluice boxes that arc given gradients of 1:12 to 1:10 or steeper.

In larger-scale operations where much fine gold is present, a ground sluice may be sectionalised with the downstream sections acting as scavengers. The slurry flow is stopped and the water is diverted back into the main stream when gold first appears in the final sluice section. The boxes arc then cleaned out and the gold is recovered by panning. Periodically, when shovelling distances become excessive, a fresh sluice is dug closer to the foot of the receding bank. The procedures arc repeated as necessary until all of the gold-bearing wash has been mined.

Ground textures vary widely and the slopes and dimensions of ditches and other earth channels must be designed accordingly. Channels are usually trapezoidal in section with sides sloping at some angle less than the angle of repose to avoid slumping. This angle may be around 45 for soft ground up to 60 for hard compact ground: wooden flumes may be used when steeper slopes

A discharge route (tailrace) is common to all sluicing methods. Normally this comprises a channel cut into the soil at a gradient sufficient to carry away all of the waste material. A gradient between 1 and 2 degrees is usually adequate to prevent settling, but it may have to be steeper depending upon the gravel size and the depth of water flowing through the race. If necessary, the race must be cut progressively deeper into the natural ground surface with increasing distance from the face. Theslope of the ground is a limiting factor and. at some stage, the spoil may have to be elevated and disposed of by hydraulic elevation or by pumping.

Ground sluicing was practised widely in early Roman times. Army engineers of the day recognised that a natural head of water could be utilised to supply energy at the working face, so streams of water were channelled for great distances in mountain areas to gold mines on which much of the prosperity of Rome depended. The method, first described by Pliny the Elder in relation to gold mining in Spain during the first century AD employs a dam which fills slowly and is periodically breached when full. The water is then directed through flumes to the pay gravels.

The same method, referred to as booming, was used in the early days of some North American goldfields in areas of less intense precipitation, i.e.. where run-off and stream flow provides only a small trickle of water. Dams were fitted with lightweight gates (counter-balanced) to which a long lever was attached. A large container was hung from the end of the lever. When the dam filled, water overflowed and filled the container. This activated the lever allowing the water to rush out and scour the channel bottom. In its lowest position the bucket tilted, spilling out the water, thus allowing the gate to reposition itself under its own weight. The gold was trapped behind riffles or stones laid along the floor of the sluice while the light materials were washed away.

Early miners used a different form of ground sluicing to mine surface exposures of gold-bearing conglomerates. The ground surface in this area was traversed by herringbone patterns of channels radiating out from single channels located in the lowest parts of the terrace. These channels acted as tributaries to collect large volumes of water running off from higher ground during heavy monsoon rain periods. The flow from these channels was directed into a central channel, which cut back into the sluicing face dislodging material for treatment in ground sluices.

The first recorded use of pipes to convey high-pressure water to the face was in the USSR in 1830. The method then emerged in the California goldfields in 1840 and soon spread to alluvial goldfields in other parts of the world. Monitors, otherwise called hydraulic giants (Fig. 7.10), were developed to enable high-pressure jets of water to be directed against the face as required. The resulting slurry was washed into a pump sump through races cut into the bedrock. Hydraulic elevators (Fig. 7.11) used to elevate the slurry to a sluice box were very inefficient, and the subsequent introduction of centrifugal gravel pumps extended the availability of gravel pump mining, to any area having an adequate supply of water, regardless of head.

Suitable ground conditions for hydraulic sluicing arc provided by small gravelly wash that is easily slurried and soft weathered bedrock in which racescan be cut to direct the slurry from the face to a head feed pump sump. A natural slope of about five degrees from the horizontal is an optimal gradient but slopes may be 30-40% flatter or steeper without seriously affecting the operation. At any such gradients, most of the slurried material gravitates from the face to the sump without excessive surging or settling out of the finer gravels.

The monitor unit, or hydraulic giant as it is sometimes called, is a nozzle for directing a stream of high-pressure water against the working face. Some larger units incorporate deflectors to give a better control of jet direction. Various degrees of sophistication arc applied to balancing the re-active thrusts developed by the jet, the simplest being counterweights attached to the arm.

Monitors arc used to undermine a pit face and so encourage slumping. Material broken by the monitor jet is slurried by the jet and washed down through races (channels) into a gravel pump sump in the pit floor. Riffle boxes may be placed in the ground races to effect an initial recovery of coarse gold. The larger stones are forked out and stacked along the sides and back of the excavation. A gravel pump elevates the remaining slurry to a gold-saving plant, which may either be a riffled sluice box or a more sophisticated jigging plant. Nozzle diameters range from around 25 mm up to 125 mm and provide jet velocities of the order of 20-50 m/sec. Pressure heads are given by the equation:

In consistent units: V is the velocity at the nozzle outlet, h is the head of water at the nozzle, g is the acceleration due to gravity, and C is the nozzle coefficient. Values for C can be obtained from the supplier: C = 0.95 is a general average.

Sufficient additional head is added to compensate for line friction and other hydraulic losses. The total required head might be of the order of 100 m or more, depending upon the length and diameter of the pipe. It is generally wise to add 20% to the calculated value to allow a safe degree of flexibility to deal with puggy clays and partly cemented gravels that might require additional energy- for dispersal. The work done by a jet of water varies according to the distance of the nozzle outlet from the point of impact. The jet loses power from the moment it leaves the nozzle. Energy is expended progressively in overcoming air friction and gravity, and the further the jet has to travel the less energy is available to do useful work. Approximate performance figures for jets of water at varying distances from the working face are given in Table 7.6. Distance from the face is a critical factor for operator safety. Because of slumping, the monitor should not be located less than bank height from the face in average ground conditions. This distance may have to be increased if there is any danger of mudflow or of dislodged boulders rolling down into the workings.

An inherent disadvantage of monitoring is the unconfined nature of the slurrying action. The method makes poor use of the available energy because the jet momentum is utilised for only part of the time in breaking down the face. There are practical difficulties in being able to direct the jet continually against the unbroken face and excessive amounts of water brought into the pit may have to be elevated out and away from it, thus increasing pumping costs. Large amounts of energy are also wasted in trying to disperse lumps of clayey wash which are moved backwards and forwards by the jet and in having to wash the resulting slurry down to a gravel pump sump for elevation to the plant. The inefficient use of hydraulic power is not critical when an adequate natural head of water is available, however, useful energy usage is often only a fraction of that generated in mechanical operations, some of which face crippling costs for power.

Gravel pumps were originally single stage, open impeller, centrifugal types, belt-driven from a diesel engine or slip ring electric motor to give a range of working speed. Pump layouts were cumbersome, difficult to prime and were usually operated close to the limit of their suction lifts. Vertical, submersible types that could be raised or lowered in the sump casing using a simple tripod and pulley arrangement, or block and tackle replaccd this pump type. Raising or lowering the pump in the sump regulated flow from the pump to the treatment plant.

Gravel pumps with enhanced priming facilities now operate from rafts floated in the sumps. This arrangement has eliminated most of the pump suction problems attendant upon high suction lifts but new maintenance problems have developed associated with submergence of the electric motor. The main problems are due to electrical breakdowns. Because of the low demand for pumps of this type, there has been little research in trying to develop better insulating qualities for the motors and shutdowns for maintenance add significantly to running costs.

Each sluicing plan is different, but a common denominator is the need to synchronise all of the pit activities. Combinations of wet and dry mining methods of mining often give the best results. Figure 7.12 shows dry feed materials being dumped into a central sluicing paddock for sluicing in the New England District of NSW where a series of small deposits are mined by dry-methods over a comparatively wide area. Many difficult materials respond better to jetting if they are stockpiled and fragmented initially by mechanical means (e.g. by bulldozing). Large earth-moving equipment may also be essential within the pit for the systematic exploitation of ground containing numerous large stones and boulders. Monitoring of such activities calls for close co-operation between the head box operator at the treatment plant and the monitor operators in the pit. Since the head box operator alone has a full overview of the working area, there is a clear requirement for him to direct all of the pit activities including the earth-moving functions.

A typical sluicing operation (as illustrated in Fig. 7.13 for Yakatabari Creek in Papua New Guinea ) commences with the development of a working paddock using mechanical earth-moving equipment to move the overburden and open up a face for monitoring. The length of the paddock will probably be about 75 mm from face to tailings disposal at the back of the excavation. Slurry monitoring from the working face is directed downslope to gravel pump sumps through races cut into the floor of the paddock as shown in the illustration. The width of the cut is held to a practical minimum, according to the variable stability of the sides and face of the channel. In unstable ground there is always the possibility of block flow and monitors will be positioned for sluicing in two or more parallel strips across the full width of the deposit. A bulldozer is used to break down the face of wash ahead of the monitors large stones and small boulders are stacked along the sides using traxcavators. The ongoing sequence will involve:

Increasingly high maintenance and energy costs tend to restrict the gravel pump method to deposits having a natural head of water available at the face. Sluicing is mainly disadvantaged by its very large water requirement, particularly in ground that does not slurry easily. This problem can be alleviated to some degree if the overburden can be removed by stripping. Mechanical stripping of overburden and the handling of heavy stones and boulders in the sluicing paddock can usually be done at less cost than by hydraulic methods. Very tough clays and partly cemented gravels respond better to jetting if broken initially by some mechanical means.

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