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Homestake Mine (South Dakota) Coordinates: 44°21′22″N 103°45′53″W. The Homestake Mine pit in Lead, South Dakota. Typical auriferous greenschist gold ore from the Homestake Mine. Two small masses of native gold (Au) are visible near the bottom right. The Homestake Mine was a deep underground gold mine (8,000 feet or 2,438 m) located in ...
Structural geology is the study of the three-dimensional distribution of rock units with respect to their deformational histories. The primary goal of structural geology is to use measurements of present-day rock geometries to uncover information about the history of deformation ( strain) in the rocks, and ultimately, to understand the stress ...
The Foxdale Mines is a collective term for a series of mines and shafts which were situated in a highly mineralised zone on the Isle of Man, running east to west, from Elerslie mine in Crosby to Niarbyl on the coast near Dalby. [ 1] In the 19th century the mines were widely regarded as amongst the richest ore mines in the British Isles.
Vein (geology) White veins in dark rock at Imperia, Italy. In geology, a vein is a distinct sheetlike body of crystallized minerals within a rock. Veins form when mineral constituents carried by an aqueous solution within the rock mass are deposited through precipitation. The hydraulic flow involved is usually due to hydrothermal circulation. [1]
Quartz reef mining. Quartz reef mining is a type of gold mining in "reefs" ( veins [ 1]) of quartz . Quartz is one of the most common minerals in the Earth's crust, and most quartz veins do not carry gold, but those that have gold are avidly hunted by prospectors. In the shallow, oxidized zones of quartz reef deposits, the gold occurs in its ...
Boudinage is a geological term for structures formed by extension, where a rigid tabular body such as hornfels, is stretched and deformed amidst less competent surroundings. [ 1] The competent bed begins to break up, forming sausage-shaped boudins. Boudinage is common and can occur at any scale, from microscopic to lithospheric, and can be ...
Boudinaged quartz vein (with strain fringe) showing sinistral shear sense, Starlight Pit, Fortnum Gold Mine, Western Australia. In geology, shear is the response of a rock to deformation usually by compressive stress and forms particular textures. Shear can be homogeneous or non-homogeneous, and may be pure shear or simple shear.
The mines are located in a horst block at Alderley Edge, Cheshire. The area is primarily of Triassic new red sandstone of the pebble beds formation. The youngest beds (members) are known locally as the Nether Alderley and West Mine sandstones followed by the Wood Mine Conglomerates, Beacon Lodge Sandstones and Engine Vein Conglomerates.