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“六五”期间，在地矿部有关部门的领导和支持下，经过有关科研院校和探矿厂、队坚持不懈的共同努力，地质坑道的掘进机械化水平有了显著提高，为坑探工程的技术进步和加强金、银、汞等贵重、有色金属矿产的普查勘探工作做出了很大贡献。目前，一些队的掘进设备不仅能够施工千米以上的坑道，以满足急需矿种深部勘探的需要；而且可以承包一些断面较大的矿山、水电与交通隧道工程。如浙江、湖南、云南、四川等局探矿工程队和地质队，去年以来使用“三车一机”承包了多处坑、隧道工程，并且取得了较施工勘探坑道更好的技术经济效果。其原因，据我们了解，这些队在承包工程中，除了实行承包合同制
During the “Sixth Five-Year Plan” period, thanks to the leadership and support of relevant departments of the Ministry of Geology and Minerals, the tunneling mechanization level of geological tunnels has been significantly improved through unremitting efforts by relevant research institutes and prospecting plants and teams. Technological progress and strengthening the gold, silver, mercury and other precious and non-ferrous metal mineral census and exploration work has made a significant contribution. At present, some of the team’s tunneling equipment can not only construct tunnels of more than 1000 meters in order to meet the needs of deep exploration of urgently needed minerals, but also contract some large-scale mines, hydropower and traffic tunneling projects. For example, there are many prospecting engineering teams and geological teams in Zhejiang, Hunan, Yunnan and Sichuan provinces. Since last year, a number of pit and tunnel projects have been contracted by using “three cars and one machine”, and have achieved better technical and economic results than the construction of exploration tunnels. The reason, we understand, these teams in the contracting project, in addition to the implementation of the contract system