1. Extractive metallurgy
1.1 Minerals and ores
Tungsten, chemical symbol W, is a rare metal: its content in the earth's crust is estimated at 10
– 6
by mass. Mineable mineral salts are scheelite CaWO
4
and wolframite (Fe, Mn)WO
4
The average WO 3 wolfram anhydride content of current mining projects is 0.4%. The most abundant deposits are in the countries of the Pacific Ring of Fire. The European contribution is small: Portugal, Spain, France (Salau, Ariège), Austria and Sweden. Soviet deposits are found...
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Extractive metallurgy
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