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This type of gold deposit crushing rocks formed by alteration of sericite, pyrite, silicification to break as a center. The ore structure is mainly disseminated, and the metal sulfide is uniformly distributed in the star-shaped and fine veins in the granitic fractured rock of the Yingyingyan granite. The gangue in the ore is quartz , sericite, a small amount of feldspar , chlorite. Silver metallic minerals gold, pyrite, copper ore, mainly galena. Silver-gold ore is distributed in fine minerals and nets in minerals such as pyrite. The gold particles are 0.2-0.02 mm. The content of sulfide in the ore is relatively small, accounting for about 3% of the total minerals. The mineral processing uses a combined process of flotation-cyanide.
A gold mine in Shandong is an altered granite containing gold ore. The production process is shown in the figure below. The ore is crushed, washed, sieved, ground, floated, cyanated, smelted and other processes to finally obtain gold ingots. The production indicators are: raw ore containing 6.41 g / ton of gold, 120.00 g / ton of gold concentrate, 95% recovery rate, 98.0% cyanide leaching rate, 99.5% washing rate and 99.5% replacement rate. The total recovery of gold is 92.17%.
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