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Type of gold deposit
1. According to the cause
Gold ore genesis habits can be divided into three categories:
Pulse gold, also known as primary gold or mountain gold. It is a gold deposit formed by internal force mineralization.
Gold is also called exogenous gold. It is a secondary gold deposit formed by the enrichment of primary gold mines under the action of nature (such as erosion, weathering, water scouring, etc.).
Associated gold, mainly refers to the gold associated with non-ferrous metal deposits.
2. Divided by world gold reserves
(1) "Land" type gold deposits, accounting for more than 50% of the world's gold reserves. An ancient metamorphic gold uranium conglomerate deposit. Natural gold has a finer particle size. More than 0.01 to 0.06mm. Distributed in the cement of quartz . Similar deposits were found in South Africa, Ghana, Brazil, and Canada. The former Soviet Union, the United States, and Australia also discovered the Mesozoic gold-bearing conglomerates.
(2) Modern sand gold mine. The uranium residue, slope product, flood pool, terrace and coastal sand deposit of the modern exogenous gold deposit. China's gold deposits such as the Jinsha River basin in Yunnan. The Inner Mongolia Golden Basin, the Heihe River in Heilongjiang and the Hunchun in Jilin are all the first few gold deposits, while the coastal sand mines still need further work.
(3) Quartz vein gold deposit. This type is widely distributed throughout the world. It has a larger proportion in China. The deposits are generally produced in the form of veins, veins, and veins. The gangue is mainly quartz, followed by carbonate minerals. Metallic minerals mainly pyrite, followed by the yellow copper ore, sphalerite, galena, arsenopyrite, pyrrhotite, and the like. Sometimes there are minerals such as tungsten, antimony , bismuth and uranium. Gold is contained in microscopic natural gold and silver gold ore. The content of gold in the ore is generally higher than that of silver.
(4) New gold and silver deposits. This deposit is characterized by a silver-rich, silver-to-gold ratio of 5 to 200 times or more. In addition to natural gold, ore has a hoof gold mine. These deposits are distributed in the Pacific volcanic belts and are found in South America, the former Soviet Union, Japan, North Korea, the Philippines, Myanmar, and Taiwan Province of China.
(5) Associated gold deposits. Such deposits account for a considerable proportion both at home and abroad. Foreign associated gold is mainly derived from porphyry copper deposits, copper-bearing pyrite-type and copper-copper- nickel deposits. The associated gold reserves in China's skarn-type copper deposits are also considerable.
(6) There are still Holmesk and Carlin-type fine-dip gold deposits in foreign countries. The former one is mainly found in the United States. The Carlin type is characterized in that the gold particles are finely impregnated, the gold particles are extremely fine (more than 0.010 to 0.005 mm), and are dispersed in the silicified carbonate-like formation. There are no obvious signs of surrounding rock and ore body.