Available options for this gold washing plant:
- Upgrade to 6′ wide x 10′ long sluice run with nugget trap and hydraulic riffles
- 20KW Generator with fuel tank
- Two spare shaker deck bearings
- Packing and shipping to Port
- Water Pump
To convert Cubic Yards to Tons: Cubic Yards x 1.4 = Tons — To convert Tons to Cubic Yards*: Tons ÷ 1.4 = Cubic Yards.
1.4 is a rule of thumb that will work for most sand and gravel products
After the gold mining equipment has been transported to the site, a camp is set up for the duration of the season The mining season generally lasts from June until the ground freezes in late September or October. The camp usually accommodates from two to five people with support faculties for maintenance and storage. After the camp is established, the associated physical mining infrastructure is constructed with a bulldozer or other earth moving equipment. This Infrastructure usually consists of two or more settling ponds, associated dikes and spillways, drainage ditches to prevent erosion and collect runoff and groundwater, and working areas for the washplant, pumps, and motors. If the area to be mined is within an active stream channel, a bypass is built to route the water around the mining area. The bypass is diked to withstand ordinary floods and to keep contaminated mine water from entering the stream.
Actual mining activities usually begin after the Infrastructure has been constructed. Trees and brush are cleared, and topsoil and overburden are stripped from the area to be mined. The stripped topsoil and overburden are stockpiled (separately if possible) usually near the mine cut, and are protected from erosion and flooding. With adequate planning, these stockpiles may be placed in a manner that promotes efficient site reclamation through reduced material handling and shorter hauling distances. Topsoil may have been stripped during the preceding mining season to allow permafrost. In layers of overburden or gold-bearing gravel to thaw. If not, frozen overburden and top-soil may be ripped and stocked by bulldozer. The extent of the area to be stripped depends upon the expected rate of production. On a typical mine, one to two acres are usually stripped
before actual mining begins. Total disturbance (or an entire mine at any one time averages between three and eight acres, although some of the larger mines may disturb up to 25 acres.
Exposed gold-bearing gravels are usually mined using a bulldozer that pushes and stockpiles the gravel near the washplant. A few operations use a dragline for these tasks. The stockpiled gold-bearing gravel is then fed into the washplant by a front-end loader or large back hoe. This practice promotes equipment efficiency by allowing the bulldozer or dragline to continue mining while the loader or backhoe feeds the washplant at a steady rate. Hydraulic stripping is another method of removing overburden and is particularly efficient when the overburden thickness is considerable. This method usually requires a very large water treatment system due to the huge quantities of water used in washing away the overburden. The removed overburden is captured in settling ponds designed for that purpose.
When the mined gravel is fed into the washplant it is classified by size using various stationary or vibrating screens. Classifying provides for more efficient gold recovery, reduced water consumption. and facilitation of mine site rehabilitation, and is practiced by most mine operators. The over-size material, usually larger than two inches, slides out of the washplant into a pile where it is moved by a front-end loader or bulldozer. The undersize material and gold-bearing gravel is mixed with water and flows through the sluice box where the gold and heavy black sands are concentrated. Tailings are the gravel, sand, and other materials which accumulate at the end of the sluice box. Tailings are routinely removed by a loader or pushed away by a bulldozer.
The water that carries the gold-bearing gravel through the sluice box becomes sediment laden and turbid. This muddy process water flows from the end of the sluice box through a pile of deposited tailings and into a series of settling ponds. These ponds are designed to hold the “muddy’ water long enough to allow the fine sediments to settle out. A limited volume of process wastewater as defined by EPA may be discharged to the adjacent stream. The physical requirements of the ponds are dependent 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 utilize a series of small settling ponds to permit flexible water management the site. Most mines utilize a series of small settling ponds to permit flexible water management. Small ponds are usually easier to build, repair, clean, replace, bypass, and rehabilitate. The use of “pre-settilng ponds” is encouraged.