由于局部地段矿脉的空间产状或脉石品质突变和成矿后的地质构造作用等因素的存在,使部分工业矿体在进行了正规的生探工作之后仍尚难回收。影响了正规的生产延伸,在开采顺序上也带来了不少困难,有的甚至因此而造成永久性损失。大吉山钨矿生产副中段的开设和利用,在很大程度上较妥善地解决了上述矛盾。多年来的实践表明:生产副中段是有效地辅助矿山探矿工作,查明本区可疑地段矿体情况,回收矿 Due to the spatial distribution of local veins or the sudden change of gangue quality and the geological structure after mineralization, some industrial ore bodies are still hard to be recovered after the formal geochemical exploration. Affected the formal production extension, caused many difficulties in the mining order, and some even caused permanent losses. The opening and utilization of the middle section of the Dajishan tungsten ore production has largely solved the above contradictions to a large extent. Practice over the years shows that the production of the middle secondary section is an effective aid to the prospecting work of mines, and the identification of ore bodies in suspicious lots in this area and the recovery of mines