Tungsten Mining Ends at Ammonium Paratungstate, Not Metal
Tungsten ore is concentrated and chemically converted to APT, an intermediate compound, before any tungsten metal or carbide actually gets made.
Wolframite and scheelite ore, covered on this material’s geology page, are mined conventionally and concentrated by gravity and flotation methods. The real processing chain continues well past that point before tungsten becomes usable.
Ammonium paratungstate (APT) as the real traded intermediate
Concentrated ore is chemically processed into ammonium paratungstate, a white crystalline compound that is the actual commodity traded on international tungsten markets, not metal or ore directly, a genuinely different market structure from most metals covered on this site, where the metal itself is the traded form.
From APT to tungsten carbide, tungsten’s largest use
APT is reduced to tungsten metal powder, then combined with cobalt binder and sintered into cemented carbide, covered in depth on cobalt’s mechanics and materials science pages, tungsten’s single largest application by a wide margin. This means tungsten’s real supply chain end point is often not pure metal at all, but this specific two-element composite.
Sources: APT processing and cemented carbide production draw on standard extractive metallurgy references (ITIA, USGS); production figures reference the production data elsewhere on this site.