山坡型贵金属矿床顺序开采时,先以露天法开采,然后以地下法开采。在某一时期内,两种方法要同时进行:结束露天开采,发展地下开采。这个期间叫做过渡期。在苏联,B.A.谢尔卡诺夫对露天和地下联合开采法作了许多研究。他根据两种方法同时进行的程度(K),对露天和地下联合开采法作了分类。这个K值按 When the slope-type precious metal deposits are sequentially mined, they are mined by the open-air method and then mined by the underground method. In a period of time, the two methods should be carried out simultaneously: end open-pit mining and develop underground mining. This period is called the transitional period. In the Soviet Union, B. A. Szczanól made many studies of open-pit and underground co-mining methods. According to the degree of coincidence (K) between the two methods, he classified open-pit and underground co-mining methods. The value of K press