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    • High School Earth Science/Mining and Using Minerals Wikibooks .

      A quarry is a type of open pit mine that produces rocks and minerals that are used to make buildings. . So, the ore must be separated from unwanted rocks.

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    • Glossary of Mining Terms Rock, Mineral and Fossil Collections .

      Abutment In coal mining, (1) the weight of the rocks above a narrow roadway Coal washing The process of separating undesirable materials from coal.

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    • Ore . mining . Britannica

      No ore deposit consists entirely of a single ore mineral. The ore is always mixed with unwanted or valueless rocks and minerals that are collectively known as.

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    • Glossary of Mining Terms

      Acidic rocks Igneous rock carrying a high (greater than 65%) proportion of silica. Acid mine drainage Acidic run off water from mine waste dumps and mill.

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    • Gangue Wikipedia

      In mining, gangue is the oft commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. It is thus distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are.

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