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Exploration of orogenic gold began after the year 1840 when the source of nearby placer gold deposits was being investigated, after which large scale mining operations began in the 1990s. [ 45 ] The Mother Lode Homestake is located in South Dakota, USA, and is a historic mine which was host to orogenic gold held within a banded iron formation ...
Diagram showing the major different types of shear zones. Displacement, shear strain, and depth distribution are also indicated. Strength profile and change in rock type with depth in idealised fault/shear zone Margin of a dextral sense ductile shear zone (about 20 m thick), showing transition from schists outside the zone to mylonites inside, Cap de Creus,
Granite and granite pegmatite (2545 ± 30 Ma) intrude metasedimentary rock of the Miners Delight Formation in the western part of the greenstone belt. The South Pass pluton is a pegmatitic granite west of South Pass City, and the Sweetwater granite is a fine-to medium-grained leucocratic granite that occurs to the west of the South Pass pluton along the Sweetwater River and Lander Creek.
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]
These schists are separated to the north by the gently northeast-dipping normal-slip Thomsons Gorge Fault which places chlorite zone TZ III schist against TZ IV. [3] [10] This low-angle fault zone has resulted in shear zone-hosted gold mineralisation in the form of the Rise and Shine Shear Zone near the Bendigo Goldfields. The Thomson Gorge ...
A shear zone is a tabular to sheetlike, planar or curviplanar zone composed of rocks that are more highly strained than rocks adjacent to the zone. Typically this is a type of fault, but it may be difficult to place a distinct fault plane into the shear zone. Shear zones may form zones of much more intense foliation, deformation, and folding.
China says it has discovered the world’s largest known deposit of gold, estimated to be worth over $80bn (£63bn).. The deposit at the Wangu goldfield in central China could yield more than ...
Economically important deposits found in the craton include gold, diamonds, copper, nickel, granite, iron ore, lead-zinc, uranium, coal, industrial minerals and arsenic. The huge Olympic Dam copper-gold operation is located in the Eastern Olympic Copper-Gold Province at the cratons eastern edge.