PRC tungsten reserves are also depleting, mines are processing more rocks for same output and sooner or later PRC going to quota tungsten exports even more for domestic stockpile and prevent over extraction.

Also related tangent, remember that anecdote about PRC finally making ball point pen tips? That was basically central gov slapping PRC metallurgists to speedrun tungsten carbide precision manufacturing for advanced munitions (penetrators), not ball point pen tips which was rounding error consideration.