Wolfram Crisis

The Wolfram Crisis (Spanish: Crisis del wolframio) was a diplomatic conflict during World War II between Francoist Spain and the Allied powers, which sought to block Spanish exports of tungsten ore to Nazi Germany. "Wolfram" is an alternate name for tungsten, a strategic material used in anti-tank weapons and machine tools. Most of the wolframite mines in Europe, such as the Barruecopardo mine, are in northwestern Spain and northern Portugal. The Barruecopardo mine, located in Salamanca, was a key source of tungsten during the war.

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