1993年10月上旬，我们实地调查了中国长城铝业公司与地方乡镇企业联合开采的5个矿点。探索四年的联合办矿，是发展市场经济条件下，开发矿业的新探索、新创举。一、联办铝矿的起因1988年，我国氧化铝生产基地原郑州铝厂要进行第四期技术改造，新增氧化铝生产能力近20万吨，需新 In early October of 1993, we investigated five coal mines jointly mined by the Great Wall Aluminum Corporation of China and local township and village enterprises. The exploration of the joint operations for four years is a new exploration and new initiative for the development of mining under the conditions of developing market economy. 1. The cause of the joint operation of aluminum mines In 1988, the former Zhengzhou Aluminum Plant of China’s alumina production base was to carry out the fourth phase of technological transformation, and the newly added alumina production capacity was nearly 200,000 tons.