Gold ore types are divided in different ways. According to the actual situation in China. In the mineral processing, the vein gold ore is often divided into the following types:
(1) Less sulfide containing gold ore. Gold is the only object of recycling, and other minerals are either of no industrial value or are only recycled as by-products. Sulfide-based mostly pyrite, low content, sometimes associated with a small amount of Cu, Pb, Zn, Mo and other minerals. Most of this ore is quartz vein type or fine vein impregnation type (hydrothermal alteration type). The natural gold particle size in the ore is relatively coarse, and the product is single. It can be recovered well by a simple flotation process.
(2) Polysulfide containing gold ore. The ore is rich in pyrite or arsenopyrite. There is also a recycling value. The gold grade is low and the change is small. The natural gold particles are relatively small and are mostly wrapped in pyrite. It is easy to select gold and sulfide from such ores, but to separate the gold from the sulfides requires a more complicated process.
(3) Polymetallic gold ore. Such ores contain in addition a gold stylish, two kinds of metallic minerals, copper, lead silver zinc, tungsten and antimony, which in turn has a single value of mining. Its main feature is that sulfide minerals account for a considerable amount (10% to 20%); natural gold is closely related to pyrite, and most of them are closely symbiotic with copper, lead and other minerals; natural gold particles have a wide variety, so the need for such ore More complicated process of selecting and smelting.
(4) Gold ore containing antimony gold. In addition to natural gold, there is still a considerable amount of gold in the form of bismuth gold, mostly low-temperature hydrothermal deposits.
In addition, another classification similar to the above classification is common in gold mines in China.
1 Quartz vein contains gold ore. The basic component of the ore is quartz, the content of which is 50% to 95%, and the metal mineral content is 0% to 15%.
2 Pyrite contains gold ore. Sulfide (pyrite) content is high (5% to 15%). More than 75% of gold minerals are closely symbiotic with pyrite.
3 multi-metal gold ore. Metal minerals contain useful minerals such as copper, lead, and zinc sulfides in addition to iron sulfide.
4 special minerals containing gold ore. Gold ore in ore, uranium and other ores.
5 quartz veins contain gold oxide ore. Oxidized ores are generally present in the shallower surface oxidation zone. According to the degree of oxidation, it can be divided into partial oxidation ore and oxidized ore. The presence of gold-containing iron hydroxide is a major feature of the mineral composition of the ore. The main metal mineral is limonite with less sulfide and the gangue is mainly quartz. Most of the natural gold minerals are found in major gangue minerals and metal oxides, and the gold-bearing grade is relatively high.
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