| category ........ Estimated cumulative and annual mine production of tungsten contained in ore and concentrate—...also recovered from placer deposits. Most current mine production of tungsten is from vein/ stockwork,...accounted for over three-fourths of the world’s mine production of tungsten. China alone produced about...of tungsten used to make these steels, mainly in North America. 4 INTERNATIONAL STRATEGIC MINERAL ISSUES...number of major producing nations, notably South Korea and China, to shift from the export of concentrates |
