出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2009/12/17 11:27 UTC 版)
Black tin is the raw ore of tin, usually cassiterite, as sold by a tin mine to a smelting company. After mining, the ore has to be concentrated by a number of processes to reduce the amount of gangue it contains before it can be sold. It contrasts with white tin, which is the refined, metallic tin produced after smelting.