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我矿矿脉的傾角一般在45～50°之間,厚度約2～3m。在这样的条件下,采用选別留矿法开采,曾遇到一些問題,也积累了一些經驗,現介紹于后,供参考。一、崩矿由于工作面靠上盘的打眼空間过高(約3～4m),靠下盘的打眼空間过低(約0.5～1m,見图1),因之下盘容易丢矿,并增加平場的工作量而影响其它作业时間。产生这种情况的主要原因是:①矿脉的傾斜度較小,
The inclination of mine veins is generally between 45 ~ 50 ° and the thickness is about 2 ~ 3m. Under such conditions, we have encountered some problems with the selection of ore-retaining methods and accumulated some experience. We will introduce them later for reference. First, the collapse of mine due to the work surface by the disk space is too high (about 3 ~ 4m), hit by the lower disk space is too low (about 0.5 ~ 1m, see Figure 1), because the next disk easy to throw ore and Increase the workload of flat field and affect other operating hours. The main reasons for this situation are: ① the slope of the veins is small,