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阿哥钮矿于1981年5月与建井公司签订合同,掘进直径4.62米、深1030米的第一通风井,然后再掘进直径6米、深860米的第二通风井。经预算采用钻井法钻进通风井,可使探矿和井下开拓工程的工期缩短14个月。建井成本预计为600万美元。
Aggo Button Mine contracted with Jianui in May 1981 to excavate the first ventilation shaft with a diameter of 4.62 meters and a depth of 1030 meters and then drive a second ventilation shaft of 6 meters in diameter and 860 meters in depth. The estimated drilling cost to drill ventilation shafts will shorten the prospecting and underground development period by 14 months. Well construction costs are estimated at 6 million U.S. dollars.