drainage from underground mines
1Dolaucothi Gold Mines — The Dolaucothi Gold Mines (grid reference SN662403), also known as the Ogofau Gold Mine, are Roman surface and deep mines located in the valley of the River Cothi, near Pumsaint, Carmarthenshire, Wales. The gold mines are located within the… …
2Acid mine drainage — Yellow boy in a stream receiving acid drainage from surface coal mining. Acid mine drainage (AMD), or acid rock drainage (ARD), refers to the outflow of acidic water from (usually abandoned) metal mines or coal mines. However, other areas where… …
3United States Bureau of Mines — For most of the 20th century, the U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.… …
4tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …
5Minera Lead Mines — Meadow Shaft of Minera Lead Mines, 1893. Location Location Gresford …
6Heath Steele Mines, New Brunswick — Heath Steele Mines, situated 60 km northwest of Newcastle, New Brunswick, Canada, at the headwaters of the Tomogonops and Little Rivers, was a large and productive copper, lead and zinc mine which operated from 1956 to 1999. The mine was an… …
7Cave Dale — (sometimes spelt Cavedale) is a dry limestone valley in the Derbyshire Peak District, England. It is located at grid reference gbm4ibx|SK149824. The northern end of the dale starts at the village of Castleton where the valley sides are almost… …
8Huehuetenango Department — Huehuetenango   Department   Flag …
9Yemen — /yem euhn, yay meuhn/, n. 1. Republic of, a country in S Arabia, formed in 1990 by the merger of the Yemen Arab Republic and the People s Democratic Republic of Yemen. 13,972,477; 207,000 sq. mi. (536,130 sq. km). Cap.: (political) San a. Cap.:… …
10North American river otter — Conservation status Least Concern …
