How are minerals extracted?
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Extracting Surface Minerals. Surface mining is just what it sounds like - removing minerals that are near the earth's surface because this is where the ore deposits are located. When the ore deposits are very large, open-pit mining is utilized. ... Once the ore is removed, the overburden is dumped back into the strip....
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minerals are extracted from the mineral ores either by calcination or by roasting.
Roasting is a process in which ore is heated below its melting point in presence of air to oxidise the impurities. ... Calcination is the process of heating the ore below its melting point an absence of air to remove volatile impurities like arsenic etc.
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