steeply dipping fissure

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• US Silver — Corporation (Tsxv|USA) is a mining company based in Wallace, Idaho near Coeur d Alene, Idaho. The Chairman of the Company is John P. Ryan, the CEO is Bruce Reid, and the President is Mark Hartmann.In 2006 USSC purchased the Coeur, Caladay, and… …   Wikipedia

• Lead — (pronEng|ˈlɛd) is a main group element with a symbol Pb ( la. plumbum). Lead has the atomic number 82. Lead is a soft, malleable poor metal, also considered to be one of the heavy metals. Lead has a bluish white color when freshly cut, but… …   Wikipedia

• Underground mining (hard rock) — A three dimensional model of an underground mine with shaft access Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals[1] such as ore containing gold …   Wikipedia

• volcano — /vol kay noh/, n., pl. volcanoes, volcanos. 1. a vent in the earth s crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals. 2. a mountain or hill, usually having a cuplike crater at the summit,… …   Universalium

• Mount Edziza volcanic complex — Mount Edziza, one of the main volcanoes of the Mount Edziza volcanic complex Elevation …   Wikipedia

• Cliff mine — This article is about the former copper mine in Keweenaw County, Michigan. For the former iron mine in Marquette County, Michigan, see Cliffs Shaft Mine Museum. Native copper specimen from the Cliff mine. Size 2.4 x 1.3 x 1.3 cm …   Wikipedia