Oil sands - Wikipedia, the free encyclopedia
The world's largest oil sands are in Venezuela and Canada. The geology of the deposits in the two countries is generally rather similar. They are vast heavy oil ...
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California Gold Mining Terms and Procedures - 1876
California Notes. By Charles B. Turrill. In California, where mining has been the leading, and sometimes, almost the only industry, the tourist naturally desires a ...
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mining | Britannica.com
Mining, underground mining: typical mine Encyclopædia Britannica, Inc. process of extracting useful minerals from the surface of the Earth, including the seas.
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Gold Mining in Southern Oregon
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