What is the original source of tin sheets
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Tin occurs in grains of the native metal but chiefly as stannic oxide, SnO2, in the mineral cassiterite, the only tin mineral of commercial significance. The metal is obtained from cassiterite by reduction (removal of the oxygen) with coal or coke in smelting furnaces. No high-grade deposits are known.
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Ores. The principal tin mineral is cassiterite, or tinstone (SnO2), a naturally occurring oxide of tin containing about 78.8 percent tin.
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