Search results
Results From The WOW.Com Content Network
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 ...
Hushing. Sketch map of the development of the Dolaucothi Gold Mines in Carmarthenshire, south Wales, showing hushing fed by aqueducts. Hushing is an ancient and historic mining method using a flood or torrent of water to reveal mineral veins. [ 1][ 2] The method was applied in several ways, both in prospecting for ores, and for their exploitation.
Occurrence. Magnesite occurs as veins in and an alteration product of ultramafic rocks, serpentinite and other magnesium rich rock types in both contact and regional metamorphic terrains. These magnesites are often cryptocrystalline and contain silica in the form of opal or chert .
By the 19th century coal mining had become an important local industry with many farmers operating mines or carting as a supplement to their income. By 1865 the coalfield was employing nearly 1,000 people. Decline began in the 19th century, with many collieries closing after 1900, but others retained a strong link between mining and agriculture.
Disaster. At 3:00 in the morning on Sunday, June 28, 1896, ninety miners were at work in the Red Ash Vein of the Newton Coal Company's Twin Shaft Mine in Pittston when the roof quickly caved in. It was believed at the time that all of the men perished. The concussion from the explosion was so great that it was heard for miles around.
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 veins. [ 1]
Amendments. The General Mining Act of 1872 is a United States federal law that authorizes and governs prospecting and mining for economic minerals, such as gold, platinum, and silver, on federal public lands. This law, approved on May 10, 1872, codified the informal system of acquiring and protecting mining claims on public land, formed by ...