白银公司露天矿二号采场,从1968年投产以来,到1984年底止,采场深度已由1932m水平下降到1738米水平。由于边坡暴露年限长达16年之久,垂直高度近200m,加之南边坡地质构造十分复杂,曾多次发生过规模不等的滑落,严重威胁下部正常生产。按设计,采场最终标高为1660m水平,还需下降78m,预计矿 Silver Company Open Pit No.2 stope, from 1968 put into operation, until the end of 1984, stope depth has dropped from 1932m level to 1738 meters level. Since the slope is exposed for a long period of 16 years and the vertical height is nearly 200m, the geologic structure of the south slope is very complex and has slipped in different scales on many occasions, seriously threatening the normal production in the lower part. According to the design, the final elevation of the stope is 1660m, and the need to drop 78m is expected