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(一)采矿法的(?)变近代各种坑内的采矿方法,是由于科学的进步发展而产生的。早期的采矿作业,仅有几种基本的采掘方决,那时候还缺乏机械设备与近代的火药知识,所以作业范围不大,产量少,而且由于生活程低底,工资不高,材料的成本也低廉,那时大多用穴掘法开采窄矿脉或星散在各处的为品位小矿体,这种原始的采掘方法在当时的条下已能达到相当的深度。对于大矿床,则大部分是用空洞采矿法与房柱法。至于矿石在周围地盘过重,如不加以支持势必頺塌的地方,则广泛采用了砌筑石墙或充填坑道等方法。
(1) The mining law (?) The modern mining methods in various pits have resulted from the scientific progress and development. Early mining operations, only a few basic digging square, when the lack of knowledge of machinery and equipment and modern gunpowder, so the scope of operations is not, less output, but also because of the low end of life, low wages, the cost of materials Also cheap at the time, most of the excavation methods used for mining narrow veins or scattered around the small grade ore body, the original mining methods at the time of the article has been able to reach a considerable depth. For large deposits, most of them are hollow mining method and the column method. As for the ore around the site is too heavy, if not to support the collapse is bound to place, then the widespread use of masonry stone walls or filling tunnels and other methods.