普里斯卡铜矿经过钻探后至1969年底估计矿石储量2500万吨,平均品位铜1.17％,锌7.6％,矿山寿命至少20年,后来储量上升至4700万吨,于是决定在露头北面先下5.5米通风井,1970年2月开工,同年12月掘至设计深度340米,打通第一中段。关于采矿方法,由于矿体倾角陡,厚度5～25米,平均9.7米。很明显,它是在露天开采范围之外,但传统的地下开采法是不实用的,也不经济。采矿设计小组作短期的世界旅行, The Pristoga copper mine, after drilling to the end of 1969, had an estimated 25 million tonnes of ore reserves with an average grade of 1.17% copper and 7.6% zinc, with a mine life of at least 20 years and later reserves rose to 47 million tonnes and decided to leave 5.5 Meter ventilation shaft, started in February 1970, the same year in December dig to the design depth of 340 meters, get through the first middle. On the mining method, due to the steep dip angle, the thickness of 5 to 25 meters, an average of 9.7 meters. It is clear that it is outside the scope of open pit mining, but traditional underground mining methods are impractical and uneconomical. Mining design team for short-term world travel,