Design of room pillar exploitations of non-expensive minerals and ornamental rocks in Spain

摘要

In the recent times, the high cost of land and the stringent environmental legislation, together with the good prices of some minerals and rocks, such as marble and roofing slate, has forced miners to foster the underground mining (Figure 1). Even if the mining costs increased in comparison to quarrying, by means of a cheap method like room & pillar, mining costs can be kept at low levels (10-20 ?/ton) in such a way that the mining of these minerals is still profitable.