Gold yield from placer gold, from MaiJin. MaiJin production in 75 to 85% since the 70 s, placer gold accounts for 15-25%.
Sand gold ore dressing methods
Native gold deposit show the earth’s surface, because of the mechanical and chemical weathering, containing gold vein gold either parent rock is broken gradually become cuttings and gold grains, etc. Then, under the transportation and separation effect of external force, the greater proportion of minerals (such as gold grains) is deposited on the slopes, river, lake shore beach, forming a certain concentration, its industrial or mining value, is called a placer gold deposit.
Placer gold deposits usually use gold dredger mining, mining, hydraulic excavator mining and underground mining (shaft), etc. Placer gold deposit is given priority to with gold dredger mining in our country, also has a hydraulic mining and mining excavator.
Placer gold ore dressing process mainly includes to choose don’t prepare lessons before and don’t work. Preparatory work is mainly composed of broken and screening process. Broken is mainly produced ore grain of sand and clay slime disintegrate. Screening is to screen out not coarse grained gold. The commonly used equipment has a flat screen, cylinder, cylinder washer, etc. Placer gold mainly by gravity separation method, this is because on the one hand, placer gold than major uniform (17.50 ~ 17.50), granularity coarser (average 0.074 ~ 2 mm), on the other hand is due to the gravity separation method is economy and simple. Gravity separation equipment commonly used in a variety of types of chute, jig and shaking table (often used to select).
MaiJin ore dressing methods
Gold ore of various types because of different nature, beneficiation methods also have different, but generally used gravity separation, flotation, amalgamation, cyanide and resin slurry method in recent years, carbon adsorption method, new technology of heap leaching of gold. For some types of ore, often using combined technological process of gold.