From the newly excavated ore from mines with very low levels of about a few grams/tonne course still needs to be upgraded to high-grade gold ore reached levels above ten grams/tonne in the way of enrichment or concentration so that it becomes feasible to extract gold.
In the separation of gold concentrate has a variety of methods and means used, begin the process of separation of gold in a simple way and gold separation by using a chemical reagent and modern equipment. Gold separation processes with chemical reactions can use the system Cyanidation Method , Froth Flotation, Heap Leaching, Gold Processing With Method Carbon In Pulp and others.
Except for high-grade gold ore or Gold Ore that is naturally a large grain size, so grain can be seen with the naked eye or without a microscope, because the ore of this type can easily be separated by panning or by using a gold separator machine to separate the gold ore minerals with gravity system that will separate the mineral carrier with a grains of gold ore or proceed with the amalgamation of mercury, forming amalgam gold
Change the scale of destruction and milling the ore into fine sand size in order to liberate granules containing copper and gold for the separation process and to prepare the appropriate size to the next process. Once the size of the ore is reduced, the process is then performed concentration by separating minerals from mineral impurities of gold, in order to obtain higher ore grades.
In Alluvial Gold Deposit, ore dug directly into the stage of the process of separating gold from mineral impurities without having to go through the mill, thus directly obtained concentrates of gold grains
- Gravity Separation / Separation of gravity: Gravity separation is a mineral separation process based on the density difference between particles and particles of ore impurities.
- Froth Flotation / Separation flotation: Froth flotation is a separation process ore from mineral impurities by way of float ore to the surface through binding to the froth.
Gold mineral carrier is also associated with sulphide deposits that have been oxidized. Mineral carrier of gold consists of gold nativ, electrum, teluride gold, some gold alloys and compounds with the elements sulfur, antimony, and selenium. Contain adequate native gold between 8% and 10% silver, but the content is usually higher. Electrum actually another type of gold native, only the content of silver in it> 20%. If the amount of silver increases, the color becomes whiter.
- Grizzlies, non moved screens
- Vibrating screens
- Spiral classifier
Example Panning Gold Equaipment , Gold Panning Machine
Spiral Concentrators are a gravity based concentrating device, that separates light density granular and sandy (10 mesh to 200 mesh (2 mm to 0.075 mm)) consistency material from heavier density material. In order to have a good separation of gold, there should be a difference in SG's of at least 1.0. One main benefit of spiral concentrators is they have no moving parts. The feed range, in percent solids, to a spiral ranges from 20% solids up to 40% solids. Depending upon the material characteristics, a maximum efficiency will usually be reached somewhere in this range. All that is required are some slurry pumps, the slurry to be separated and the banks of spirals with a feed distributor.
Shaking Table: The tools used in the separation process to separate gold with precious minerals worthless minerals based on differences in specific gravity of minerals through the thin fluid flow. Therefore this process is included in Flowing Film Concentration. This separation principle is that the size of the mineral should be fine because of this concentration process based on a thin fluid flow. The presence of water thrust on the same particle size but different weight of its kind, the lighter particles will experience a greater boost water from heavy particles.
With the movement back and forth from the "head motion" then the heavy particle will be moving further away from the lighter particles until the particles enter the shelter. To obtain a turbulent flow of water then mounted equipment that is "riffle", thus the lighter particles will tend to jump from one riffle to riffle other than the heavy particle will only roll in the direction of the riffle. This process runs continuously so that the mineral has a specific gravity of the light can be separated.
Gold separation device is very effective for separating gold from rock oxyde at 200 micron, 400 micron sulfide rocks, and 1000 micron silica. Jigging is a valuable ineral separation process with no valuable minerals based on differences in the mineral density with vertical fluid flow. In jigging occurs stratification or bedding on the particles to be separated. This happens because the particles are different from its density. Jigs is an easy alternative concentrator operated, can generally be run effectively on the largest size of 2 cm and the smallest 10 mesh.
Then the results of this process is a concentrate containing gold ore with great content, and mud washing consisting of mineral impurities in gold ore. Further processed to concentrate the gold extraction process.