hardrock mining
1Hardrock Hundred Mile Endurance Run — The Hardrock Hundred Mile Endurance Run is an ultramarathon 100.5 miles in length, with convert|33000|ft|m of climb at an average elevation of over convert|11000|ft|m. The race is held on a loop course on 4WD roads, dirt trails, and cross country …
2Mining — This article is about the extraction of geological materials from the Earth. For the municipality in Austria, see Mining, Austria. For the siege tactic, see Mining (military). For name of the Chinese emperor, see Daoguang Emperor. Simplified… …
3General Mining Act of 1872 — 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… …
4Gold mining in Alaska — Gold mining in Alaska, a state of the United States, has been a major industry and impetus for exploration and settlement since a few years after the United States acquired the territory from Russia. Russian explorers discovered placer gold in… …
5Gold mining in the United States — has taken place since the discovery of gold at the Reed farm in North Carolina in 1799.In 2006 the United States produced approximately 8.360 million troy ounces (260 tonnes) of gold, making it the second or third largest gold producing nation,… …
6Gold mining in Colorado — Gold mining in Colorado, a state of the United States, has been an industry since 1858, and played a key role in the establishment of the state of Colorado.Explorer Zebulon Pike heard a report of gold in South Park, present day Park County,… …
7Gold mining — Gold mine redirects here. See Goldmine for other uses of the term. Gold mining consists of the processes and techniques employed in the removal of gold from the ground. There are several techniques by which gold may be extracted from the Earth.… …
8Nome mining district — Cape Nome mining district   unincorporated mining district   …
9Placer mining — (pronounced plass er ) refers to the mining of alluvial deposits for minerals. This may be done by open pit (also called open cast mining) or by various forms of tunneling into ancient riverbeds. Excavation may be accomplished using water… …
10National Mining Hall of Fame — and Museum Entrance Established 1977 Location Leadville, Colorado …
