Those materials left over after the economically extractable portion of the mineral being mined has been separated from the ore.
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separate aluminum oxide powder from unwanted materials
Panning, filtering, mining & chemical mining
Basically, anything that is not grown has to be dug out of the earth. That includes all metals, all minerals, oil and gas deposits. Odds are the power you are using in your computer right now came from mining- coal, oil, gas or uranium. Your computer contains 37 different elements that were obtained by mining. The wires that bring electrical power to your home are metals- from mining. It would be hard to find a room in your home that does not contain something that came from mining.
The two types of mining are Open-cast mining and Underground mining. Underground mining is further divided in to Adit mining and Shaft mining.
they design mining equitment