多矿并举天地宽勇佐芳，丁立平山东乳山市硫铁矿始建于１９７６年，设计能力年采选３万ｔ。精矿标矿０．８万ｔ。由于地质品位不高，经济效益也难上去，计划经济条件下企业尚可勉强生存。８０年代中期后勉强生存难以为继，即使精打细算，先是维简费提不出，后是发工资都困... The multi-mine and the world Tian Yong, Guang Yong Zuo Fang, and Ding Liping Shandong Rushan Pyrite Mine was founded in 1976, and its design capacity is 30,000 tons per year. Concentrate ore 0.8 million t. As the geological grade is not high, the economic benefits are also difficult to rise. Under the planned economic conditions, the company can still survive. After the mid-1980s, it was difficult to survive, and even if it was carefully planned, the first thing was that it was not possible to raise money, but later it was all trapped in wages...