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Of course coal is neither a rock or a mineral since it's organic though folks refer to it as a rock. Usually coal is associated with sedimentary rock. You can find shale associated with it. If your...

The old copper mines in Southern Arizona like Bisbee and Morenci were started to process copper ore which was essentially low content ore found in the soil however before the open pits they were...

Geologists know the type of rock found in say in location "A" and they know what types of Rocks and Minerals are associated. They know if you are looking for economically important minerals you...