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Bitcoin mining is performed by high-powered computers that solve complex computational math problems; these problems are so complex that they cannot be solved by hand and are complicated enough to tax even incredibly powerful computers. Key Takeaways Bitcoin mining is the process of creating new bitcoin by solving a computational puzzle. Bitcoin mining is necessary to maintain the ledger of transactions upon which bitcoin is based.

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Agricola, author of De Re Metallica Gallery, 12th to 13th century, Germany Mining as an industry underwent dramatic changes in medieval Europe. The mining industry in the early Middle Ages was mainly focused on the extraction of copper and iron. Other precious metals were also used, mainly for gilding or coinage.

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Learn About Being a Miner What does a miner do? A miner works with elements underground to extract coal and ore and bring them to the surface.

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Under the Federal Mine Safety and Health Act of or use the online filing option For more information, see this page. You do not need to identify yourself! To report an imminent danger hazardous condition call: or use the online filing option for more information, see this page.

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Raw coal is found in deposits in the earth. Coal miners bring coal to the surface. They transport coal to preparation plants where preparation plant operators process the raw coal according to buyers' needs. Miners also work to ensure mine safety.

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Roles[ edit ] Different functions of the individual miner. Many of the roles are specific to a type of mining, such as coal mining. Roles considered to be "miners" in the narrower sense have included: Hewer also known as "breaker" or "pickman"whose job was to hew the rock. Collier, a hewer who hews coal with a pick.

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