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As geological processes apply pressure to dead biotic material over time, under suitable conditions, its metamorphic grade increases successively into: Peat, considered to be a precursor of coal, has industrial importance as a fuel in some regions, for example .
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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. Initially, many metals .
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On the citys outskirts, Vale operates truly gigantic iron ore open-pit excavations. A look at this locations Google Earth images reveals their scale. To the northwest of the city, vast areas are delineated by benchesterraces descending into expansive pits. From .
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As an island nation shut off from the rest of the world for a long time (with mild exceptions from China and Korea), Japan is very homogeneous. Almost 99% of the population is of Japanese ethnicity. The largest minority are Koreans, around 1 million strong, many in .
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BARROW ISLAND The Barrow Island oil field off the coast of Western Australia, has been producing crude oil since 1967 and is the largest onshore oil field in AustraliaDEGRUSSA The DeGrussa copper, gold & silver mining operation began production in early .
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From the start of copper mining in the Michigan copper district, ore has been divided into two classes. The rock with higher copper content was smelter ore, also called direct shipping ore, and required no treatment before going to the smelter. The rock with less .