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Hydrothermal mineral deposits are accumulations of valuable minerals which formed from hot waters circulating in Earth's crust through fractures. They eventually produce metallic -rich fluids concentrated in a selected volume of rock, which become supersaturated and then precipitate ore minerals. In some occurrences, minerals can be extracted ...
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]
Ore shoot. An ore shoot is a hypogenic mass that is deposited in veins within a planar channel or lode, found in a shear or fault zone, fissure or lithologic boundary. [1] The ore shoot is the area of concentration which contains a primary ore along the veins present in the rock, and consists of the most valuable part of the deposit.
Risca colliery disasters. The Risca colliery disasters were a series of catastrophic mine explosions near the Welsh town of Risca (then in the county of Monmouthshire) in the nineteenth century. The most serious of these were in 1860 when more than 140 died in the Black Vein colliery [1] and in 1880 when 120 died at the New Risca colliery.
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 ...
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 ...
The Big Vein was discovered in 1804, in an outcrop east of Frostburg, Maryland, [27] but it was not until 1824 that small-scale shipment to Georgetown began. The first mine was the Neff mine, later known as the Eckhart mine 39°39′4.46″N 78°54′1.59″W / 39.6512389°N 78.9004417°W / 39.6512389; -78.9004417
Adit. Look up adit in Wiktionary, the free dictionary. An adit (from Latin aditus, entrance) [1] or stulm [2] is a horizontal or nearly horizontal passage to an underground mine. [3] Miners can use adits for access, drainage, [4] ventilation, and extracting minerals at the lowest convenient level. [1] Adits are also used to explore for mineral ...