According to the historical materials,the famous Gejiu Sn deposit was first exploited for Ag(Pb) Zn ore at Yindongkuang of Laochang orefield in 1290.

• 著名的个旧锡矿,据史料在元廿七年(1290年),率先在老厂矿区银铜矿开始采银(铅)锌矿。