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70年代初,为了提高矿石回采率,基洛夫矿务局的工程技术人员建议,对于过去损失的矿石在下部矿体一次开采的同时先用露天法,晚些时候用地下法进行二次开采(图1)。矿床露天法二次开采的主要条件是:1932～1940年开采过的矿体,矿石含铁的边界品位高;在研究岩石移动带航测结果、确定采空区废石充填程度和分析地表沉陷速度之后,确定了露天开采的安全边界;
In the early 1970s, in order to increase the recovery rate of ore, engineers and technicians at Kirov Bureau of Mines advised that the ore that was lost in the past should be open-pitted at the same time as the lower orebody at one time, and later subsoil by underground method (figure 1). The main conditions for the second mining of the open-pit deposit are: the ore body mined from 1932 to 1940 with high iron ore boundary grade; the navigation test result of rock movement zone was studied to determine the filling degree of waste rock in the goaf and to analyze the speed of surface subsidence After that, the safety margin of open pit was confirmed.