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An orogenic gold deposit is a type of hydrothermal mineral deposit. More than 75% of the gold recovered by humans through history belongs to the class of orogenic gold deposits. [1] Rock structure is the primary control of orogenic gold mineralization at all scales, as it controls both the transport and deposition processes of the mineralized ...
A shear zone is a zone of strong deformation (with a high strain rate) surrounded by rocks with a lower state of finite strain. It is characterised by a length to width ratio of more than 5:1. [1] Shear zones form a continuum of geological structures, ranging from brittle shear zones (or faults) via brittle–ductile shear zones (or semibrittle ...
The shear related deposit is the central ore body and is flanked by the epithermal gold to the west and intrusive related gold to the east. The two latter deposits are influenced by extensional forces from the outer areas of the shear zone. [1] [3] The early Permian epithermal gold deposit was derived mainly from meteoric water that filled in ...
The high frequency of gold mineralization in and near the Net Lake-Vermilion Lake Deformation Zone suggests that this deformation zone may very well also contain gold deposits; [9] at least 11 have been discovered within a 4 km (2.5 mi) length of the deformation zone. The gold deposits are found in many rock types, indicating a stronger gold ...
The Homestake Mine was a deep underground gold mine (8,000 feet or 2,438 m) located in Lead, South Dakota. Until it closed in 2002 it was the largest and deepest gold mine in the Western Hemisphere . The mine produced more than forty million troy ounces (43,900,000 oz; 1,240,000 kg) of gold during its lifetime. [1]
The Illinois Creek lode gold-silver mine exploited a shear-hosted gold deposit which was partly expressed as color anomalies visible from aircraft. Located on State of Alaska land, it was discovered in the 1980s.
For gold, a large gold mine was found in the Nenjian-Heihe melange zone within the CAOB. [30] This gold mine, namely the Yongxin gold deposit, is a fracture-controlled gold deposit with a thickness of 52m at the largest ore body. [30] Pyrite, which is the most important mineral that host gold, could be found in the mine. [31]
Lega Dembi is part of the Adola gold deposit, and was discovered in the 1930s. The mine was developed by the Ethiopian empire with forced labor and penal servitude. At this time, a garrison of 900 soldiers provided security for the mine; displaced locals were killed or tortured for artisanal mining in the area or for collecting coffee near the ...