They are also called Primary Tungsten Sources, Marketable ore concentrates of Scheelite and Wolframite contain typically 65 – 70 % W03, Off grade concentrates having lower W03 concentrations are seldom on the market and if so, only for a lower price. In fully integrated companies lower grades (6-40% W03) are often preferred, because upgrading to high concentrations is mostly combined with a lower yield.
Concentrates in former times have been the main trading product, but were substituted today by APT. Concentrates are packaged either in large polyethylene “big bags” (1 t0 2 tons) or, alternatively, in steel drums and individual packaging (50 t0 200 kg).
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