open-stope method

open-stope method

[¦ō·pən ¦stōp ′meth·əd]
(mining engineering)
Stoping in which no regular artificial method of support is employed, although occasional props or cribs may be used to hold local patches of insecure ground.
References in periodicals archive ?
The superiority of the backfill mining method over the traditional open-stope method is shown in Figure 1, and it comprises, for example, removal of goaf hazards and prevention of surface subsidence, reduction in tailings emissions and environmental protection, pillar replacement with backfills and effective resource recovery, reduction of deep ground temperature and weakening of rock burst, etc.
In order to evaluate the superiority of the backfill mining method over the traditional open-stope method in normal operation, the stabilities of the HSRS in two of its most dangerous situations were calculated using the simplified Bishop method, Fellenius method, and simplified Janbu method [6, 20] (Figure 6).
As shown in Figure 6, the safety factors of HSRS in the open-stope method using the simplified Bishop, Fellenius, and simplified Janbu methods for normal operation are 1.561, 1.480, and 1.485, respectively.
With an average safety factor of 1.380, the HSRS in the open-stope method shows substantially lower seismic stability and high levels of potential destruction.
(2) In stability analysis, the average safety factors of HSRS for normal operation are 1.575 (backfill method) and 1.509 (open-stope method), and for seismic conditions, they are 1.470 (backfill method) and 1.380 (open-stope method).
Caption: Figure 1: Superiority of the backfill mining method over the traditional open-stope method.
Caption: Figure 6: Safety factors of HSRS in normal operation: (a) open-stope method using simplified Bishop method; (b) backfill method using simplified Bishop method; (c) open-stope method using Fellenius method; (d) backfill method using Fellenius method; (e) open-stope method using simplified Janbu method; (f) backfill method using simplified Janbu method.
The mine produces 10 million metric tons (mt) of ore per year containing copper, uranium and traces of gold and silver, using sublevel open-stope methods.
Mining is carried out using large-diameter blastholes and open-stope methods. Trackless load-haul-dump units move ore from stopes to an underground crushing system.