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大厂长坡锡矿属于锡—多金属硫化矿。随着开采深度的变化、细粒嵌布(锡石结晶粒度0.2～0.01毫米)的矿石量逐渐增多,选矿过程产生的矿泥较多,原有的选矿流程已不适应。特别是细粒锡石,在生产中只能回收很少一部分。据1972年的测定,74～37微米的粒级回收率为12.71～34.20％,
Dachang Chang Tin Tin is a tin - polymetallic sulfide ore. With the change of mining depth, the amount of fine grained cloth (cassiterite crystal grain size of 0.2 to 0.01 mm) gradually increased, the process of mineral processing mud generated more, the original beneficiation process has not adapted. In particular, fine-grained cassiterite can only be recovered in small quantities in production. According to the determination in 1972, the recovery rate of size fractions from 74 to 37 microns was 12.71 to 34.20%