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INTERNATIONAL TUNGSTEN INDUSTRY ASSOCIATION

Information on tungsten: sources, properties and uses

Tungsten Reserves

Reserves are defined by the USGS, as "That part of the reserve base which could be  economically extracted or produced at the time of determination.  The term reserves need not signify that extraction facilities are in place and operative.  Reserves include only recoverable materials".  But different countries use different definitions and, furthermore, what is deemed "could be economically extracted" will also differ between countries.  So the estimated tonnages should be treated with caution.