Underground Mining at Rio Tinto
During the last fifteen years, numerous attempts have been made to mechanize the operations of loading ore and placing till. It is to be regretted that, to date, little progress has been made in this direction. The comparative efficiency of manual labour in Spain is the factor largely responsible for the failure to cheapen costs by mechanization. The necessity for careful classification of the ore and the need for keeping all openings small also makes the problem one of difficulty.
Air, compressed air, cubic yard, ore, Porphyry Porphyry, stopes, Cost, Costs, Drill, Ore, Ores, Shafts, stope, stopes