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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,
The Kasubuya Project is hosted dominantly within granite directly south of the regionally and historically significant gold producing greenstone belt of the Geita goldfield south of Lake Victoria. The property is located at the eastern end of the Geita greenstone where it starts to trend to the south and then southeast due to doming of the ...
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.
The Todi Shear Zone is a 400 kilometer shear zone extending into Liberia from Sierra Leone, where it separates the Kasila Group and the Kenema Assemblage, before continuing offshore. In Liberia, it separates the granite and greenstone Archean rocks from Neoproterozoic granulite and amphibolite rocks, dating to the Pan-African orogeny .
The majority of primary gold deposits fall into two main categories: lode gold deposits or intrusion-related deposits. Lode gold deposits, also referred to as orogenic gold are generally high-grade, thin, vein and fault hosted. They are primarily made up of quartz veins also known as lodes or reefs, which contain either native gold or gold ...
By 1975, mining operations had reached the 6,800-foot (2,073 m) level, and two winzes were planned to 8,000 feet (2,438 m). [7]: 63–66, 73–74 Homestake high-grade gold ore, view is about 1.2 cm wide. The gold ore mined at Homestake was considered low grade (less than one ounce per ton), but the body of ore was large. [8]
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