大塊的觀測 一、大塊產生的情况为了了解大块矿石的产生原因,曾在坑內进行了一些調查和观測(表1)。由下表及曲線图上,可以看出,所采下的矿石块度量是极不均勻的,如每次爆下矿石以10～50公厘的碎块及大于400公厘的大块較多,而合乎出矿要求的中块較少。大块产量过多,使采場出矿困难,出矿效率低;二次爆破火藥量消耗大及出矿工人的体力劳动 Large-scale observations A large chunk of the situation In order to understand the reasons for the production of large ores, conducted some surveys and observations in the pit (Table 1). From the table and the graph below, we can see that the mining of ore measures are very uneven, such as each blasting ore to 10 to 50 mm fragments and more than 400 mm large chunks , While less in line with the requirements of the mine out. Excessive chunks of output make it difficult for the stope to go out of mine, resulting in low efficiency in outflowing. Excessive consumption of secondary explosives and physical labor of miners