Yunnan Tin Company Limited, together with its subsidiaries, engages in the exploration, mining, beneficiation, and smelting of metal ores, such as tin, copper, zinc, and indium in China and internationally. The company offers Copper products, including cathode copper; precious metals, such as indium and silver ingots; and bismuth ingots, sulfuric acid, and copper sulfate. It also provides tin chemicals, such as Stannous sulfate and chloride, tin dioxide, stannous chloride and oxide, anhydrous stannous chloride, sodium stannate, metastannic acid, zinc stannate, hydroxy stannate, stannous pyrophosphate, stannous methanesulfonate, methyltin mercaptan, tetrabutyltin, dibutyltin oxide, anhydrous tin tetrachloride, and butyltin chloride mixture. Yunnan Tin Company Limited was 1998 and is based in Kunming City, China.