我国大、中型有色矿山多半是解放初期探明,经历二、三十年开采以后,大部分矿山已进入了中晚期。根据有关统计:125个统配矿山约有40%存在矿量危机、保有年限不到5年,且品位下降,使得产量产值降低、经济效益不理想。在这种局面下,应力求开辟新的资源途 Most large and medium-sized non-ferrous mines in our country were proved during the early liberation period. After two or three decades of mining, most of the mines have entered the middle and late stages. According to relevant statistics, about 40% of the 125 unified mines have a crisis of mine volume, with a retention period of less than 5 years and a drop in grade, resulting in lower output value and less favorable economic benefits. Under such circumstances, we should strive to open up new resources