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云锡老厂胜利坑七区是老厂唯一生产铝矿的工区。矿体产状属复杂四类型,矿床为土状氧化矿,围岩为大理岩,用分层崩落法回采。围岩节理发育,裂缝溶洞较多,有大量采空区及废旧巷道与其他工区相连。云锡属矽尘危害较小的矿山,但存在放射性危害,特别是七区的氡浓度是云锡各工区最高的,据1976年12月的一次测定,其坑内平均氡浓度竟高达10.46艾曼。通过1976年底开始对该区通凤系统进行调查研究、试验改进,目前该区的氡浓度已普遍下降到1艾曼以下,有效风量已提高到60％以上,初步
Yunxi old factory victory pit seven districts is the only factory producing old aluminum mines area. Ore bodies are complex types of four types of deposits for the soil oxide, rock as marble, with caving mining. Rock joints developed, more cracks karst, a large number of goaf and waste roadway connected with other work areas. Cloud tin is a mine less damaging with silica dust, but with radioactive hazards. In particular, the radon concentration in the seven districts is the highest among all the Yunnan-tin working areas. According to a survey conducted in December 1976, the average radon concentration in the pit was as high as 10.46% . By the end of 1976, the research on the Tongfeng system in the area began to be improved and the test was improved. At present, the radon concentration in this area has generally dropped below 1 Aiman, and the effective air volume has been raised to over 60%