Deep Rock Mining | The Work of Douglas G. Brandow
Douglas began his "mining adventures" to the origins for the finest gem rough in the world, deep into the jungles of Brazil, ...
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Douglas began his "mining adventures" to the origins for the finest gem rough in the world, deep into the jungles of Brazil, ...
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"Deep mining" means any method of extracting coal from the subsurface, except openpit mining and auger mining, and includes methods such as drift mining, shaft ...
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