Chinese alluvial gold placer
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Chinese alluvial gold placer
China is vast in territory and has plenty of rivers and streams. The gold mine has favorable geological conditions and abundant sand.
Gold mineral resources
According to incomplete statistics, our country has known the alluvial gold placer gold placer gold deposit, selected
More than 3200, the alluvial gold placer gold placer gold mineralization, selection and alluvial gold placer gold, choose different
There are tens of thousands of them. They are distributed in 27 provinces (municipalities, autonomous regions), and almost all over the country
Provinces. Overview of placer mineral resources with many points, wide, divided into groups with concentration.
Cloth and strong reserves and other characteristics, is one of the world's major placer gold resources in the country, but also
Alluvial gold placer gold, an important national election.
Formation factor
The placer gold deposit formation mainly depends on three factors: the supply source, hydrodynamic conditions,.
Appearance characteristics. We focus on these three aspects of a comprehensive analysis of China's gold distribution.
Distribution condition
1. control the distribution of placer gold is strictly controlled by the gold bearing geological body
Geological gold is the material basis of formation of gold, and directly influence its distribution. "
The gold bearing geological bodies mainly include gold mineralized bodies, associated gold deposits (spots) and gold bearing abundance
Highly valuable formations and rock masses
Actual data indicate:
(1) the distribution of most placer gold deposits is closely related to the origin of rocks and gold deposits, but a few are limited to others
Geological conditions, although the distribution of rocks and gold deposits may not be formed sand gold deposits, such as small Qinling Mountains is
The gold ore forming area is limited to geomorphic conditions and fails to form placer gold deposits. On the contrary, in great Xingan
The ridge north and Altai area is densely covered area of placer gold, currently only found some native gold point
Or mineralized point
(2) the old basement strata and a large area of invasion of placer gold metallogenic zone mostly distributed in the high abundance of gold
Denudation zone of entering rock
Such as Hunan, Xiangjiang, Yuanjiang, the Miluo river water resources, Jiangxi, Xiushui, Changjiang, Xinjiang, new
An Giang River placer gold is mainly distributed in the Jiangnan the Banxi group, LENGJIAXI strata
The placer gold deposits in Northwest Sichuan mainly come from the pre Sinian jade group,
The Maoxian group and three in the Silurian Triassic strata, and the gold point at the junction of Guangdong and Guangxi;
The area of placer gold is mainly distributed in the Caledonian fold basement of Sinian and Cambrian strata in the former;
Big, small Xingan mountain area of placer gold is mainly distributed in the Hercynian magmatite large area of exposed areas,
The area is alluvial gold placer gold, selected area.
(3) most of the material sources of placer gold deposits are multi-source, such as gold placer gold deposits
The source rocks are mainly the lower Cretaceous gold bearing gravel beds, followed by the dispersed ones in the two depressions
Jin Shiying vein, Jurassic gold bearing conglomerate and other multi-source recharge, such as the Hunchun River on both sides of a large area
Gold bearing veins in the intermediate acid magmatic rocks of the fabric and associated gold around the gold bearing altered zone
Mine and three Ji breccia is the source of placer gold supply.