The principle of the rocker is simple As the cradle is rocked water washes the finer material through the bottom of the hopper and gold collects on ridges or rifflesRockers were used extensively for placer mining With one man to load soil and water and a second to rock it the rocker could process about 200 buckets per day.
Rockers were introduced in 1848 by Georgian Isaac Humphrey and quickly replaced panning as the preferred method for sampling gold in placer deposits.
In a standard mining operation rockers must be cleaned every two to three hours Cleaning may be more frequent if a richer material such as clay is processed and when gold begins to surface on the apron.
The apron part of the rocker is then dumped into a pan Material trapped in the riffles of the sluice gets taken up with a flat scoop situated at the head of the sluice and then washed with clear water The remainder is scraped off the boards and put into a pan with the apron concentrate which is cleaned in the pan Sometimes clay in the payload gets processed in the rocker If gravel is too thick and sticky because of clay it sometimes has to be soaked in a tub before rocking.
As with panning and sluicing water supply is critical to a rocker operation If there is not a plentiful water supply a small reservoir may be constructed in the front of the rocker to serve as a settling basin and another at the rear used to drain any overflow The water is usually reused.
The rocker is only a primitive machine having a capacity but onefifth as great as that of the sluice box but because it is cheap requires but little water and saves a high percentage of coarse gold the rocker will continue to be used in many districts.
Nov 03 2011nbsp018332In the early days sluice boxes were built bigger and bigger as gold mining methods became more aggressive It was not uncommon for entire creeks to be run through a sluice box for gold extraction In some cases they would dam a river to run big water guns that washed the sides of valleys down into the river and through a large sluice box.
DIY Sluice Box Building a sluice box for gold prospecting is a fairly simple project and is a fun way to spend the winter in preparation for the mining season Using simple tools you can design and make your own sluice box and be prospecting for gold in no time Build your own prospecting equipment.
Sep 25 2017nbsp018332Alluvial Gold Prospecting Rocker box Pages 1 Login to reply 1 DrDuck Member 14 September 2017 0512 pm Will this be our future should the pump ban continue Interesting video re Rocker Boxes High banker sluice pans sieves ampetc Makro Multi Kruzer Deteknix Xpointer Pro comes from learning from others SDC2300 Gold.
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Gold Cradle Rocker Box River Sluice High Banker Trommel Prospecting Ive looked at most prospecting mats and would not use any of them in a rocker they are fine for directional flow but not side to side Where the Pocket and Crevis mats are designed to be used in both.
Sep 17 2016nbsp018332Placer gold mining Korea ca 1900 Man panning for gold in Madagascar Rockers and sluice mining Sluice box Riffles with gold dust and gravel Rocker box cradle Rocker box cradle Beach miners Nome Alaska Beach miners Nome Alaska Beach miners Nome Alaska Hydraulic mining Hydraulic monitor.
Show above is a portable rocker that is easily built The six bolts are removed to dismantle the rocker for easy transportation The material required to construct it is given in the following tabulation.
Sep 01 2020nbsp018332Build Your Own Gold Rocker Box Sluice Plans DIY Prospecting Mining Equipment This is a great Rocker Box design You will build your own using my plans It will be 42quot high and 18quot wide when youre done I will email you a PDF to the email address you provided to PayPal so you can print them out any size If you wish hard copies on 8 12 X 11 paper mailed to you as well please.
A dipper may be made of no 2 12 can and 30 inches of broom handle Through the center of each of the rockers a spike is placed to prevent slipping during operation In constructing riffles it is advisable to build them in such a way that they may be easily removed so that cleanups can be made readily Two planks about 2 by 8 by 24 inches with a hole in the center to hold the spike in the rockers are also required These are used as a bed for the rockers to work on and to adjust the slope of the bed of the rocker.
Assembly The parts are cut to size as shown in Figure 2 The cleats on parts A B C and D are of1 by 2inch material and are fastened with nails or screws The screen H is nailed together and the handle L is bolted to one side Corners of the screen should be reinforced with pieces of sheet metal because the screen is being continually pounded by rocks when the rocker is in use The apron K is a frame nailed together and canvas is fastened to the bottom Joints at the comers should be strengthened with strips of tin or other metal.
Parts are assembled as follows place bottom C end A with cleats inside middle spreader D with cleat toward A and end spreader E in position between the two sides B as shown Insert the six bolts and fasten the nuts Rockers F should be fastened to bottom C with screws Set apron K and screen H in place and the rocker is ready for use.
If onequarterinch lag screws are driven into the bottom of each rocker about 5 inches from each side of the spike and the heads are allowed to protrude from the wood a slight bump will result as the machine is worked back and forth This additional vibration will help to concentrate the gold If screws are used metal strips should be fastened to the bedplates to protect the wood.
Operation Gravel is shoveled into the hopper and the rocker is vigorously shaken back and forth while water flows over the gravel The slope of the rocker is important for good recovery With coarse gold and clayfree gravel the head bed plate should be 2 to 4 inches higher than the tail bed plate If the material is clayey or if fine gold is present lessen the slope to perhaps only an inch.
The rate of water flow is also important Too much water will carry the gold through the rocker without settling and too little will form a mud that will carry away fine gold Water may be dipped in by hand or fed with a hose or pipe Photo 2 It is important to maintain a steady flow of water through the rocker When all the material that can pass through the screen has done so the screen is dumped and new material added and washed The process continues until it is necessary to clean the apron Frequent cleanups on the order of several times a day are necessary for maximum recovery.
For cleanup the apron is removed and carefully washed in a tub The riffles are cleaned less frequently whenever sand buildup is heavy After cleanup the rocker is reassembled and processing resumed The collected concentrates are further refined usually by amalgamation or panning Mercury is sometimes added to the riffles to collect fine gold.
Two people operating a rocker and using 100800 gallons of water can process 3 to 5 cubic yards of material in 10 hours The capacity of rockers may be increased by using a power drive set for forty 6inch strokes per minute A power rocker operated by two men can process 1 to 3 cubic yards of material per hour The rocker is an improvement over the gold pan but is limited by the need for frequent cleanups and poor fine gold recovery Rockers are not widely used today.
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Rocker box Wikipedia the free encyclopedia A rocker box also known as a cradle is a gold mining implement for separating alluvial placer gold from sand and gravel which was used in placer mining.
Mining Techniques of the Sierra Nevada and Gold Country by Snowy Range Reflections staff Panning for Gold Panning was the oldest and simplest way to separate gold from surrounding rock It was the most basic method to obtain placer gold.
Gold Rocker Box Plans Elmer Verbergs Vertical Wobbler Elmers vertical wobbler engine is a two cylinder inverted wobbler style where the motion of the cylinders automatically operates the valv Woodworking is a craft of producing furniture or whatever is created of wood.
Our compact sized Rocker Box allows you to quickly get up and running in your favorite gold spot No more classifying no more struggling to get your sluice box flowing just right this guy does all that work for you All you need to do is set it up and add pay dirt the Rocker Box.
Sep 25 201701833214 September 2017 07 28 pm This is interesting from several perspectives ChrisFirstly youve got to respect this guys enthusiasm for the old school way of doing things Secondly it shows quite clearly just how effective this rudimentary tool was at catching even fine gold and I think his revised model with a few moreproper riffles and gold mat etc will improve its capability out of site.
Jul 15 2019018332The rocker box replaced panning for many prospectors searching for placer gold deposits particularly once a deposit was found and the miner wanted to process more gravel The process of using a rocker box has changed little since first introduced Rocker boxes are built in three parts which include a sluice box a screen and an apron.
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