2441 Precious metals production

244110 Silver, unwrought or in semi-manufactured forms, or in powder form 244120 Gold, unwrought or in semi-manufactured forms, or in powder form 244130 Platinum, unwrought or in semi-manufactured forms, or in powder form 244140 Base metals or silver, clad with gold, not further worked than semi-manufactured 244150 Base metals clad with silver and base metals, silver or gold clad with platinum, not further worked than semi-manufactured