Until recently little had been published on methods of treating any of the uranium ores for the extraction of radium, although a number of patents have
Lateral Development In tabular, dipping lodes and thick massive deposits the ore bodies are developed laterally at several horizons spaced at more or less regular
Refiners of lead by the Parkes process have always been solicitous of recovering the zinc used in the desilverization, and justly so, as the loss
The reasons for manufacturing steel by the duplex process are, briefly: saving of time; increasing output for capital invested; and avoiding the difficulty sometimes experienced
Conventional mine shaft sinking methods involve the performance of a cycle of different operations—drilling and blasting, removal of smoke and cleaning of fly-rock lodged on
Costs of sinking a mine shaft vary with the size and depth of the shaft; nature of the rock (the ease with which it can
The technical literature is replete with descriptions of and data on shaft sinking equipment, methods and costs. The subject of shaft sinking has been discussed
Cupellation is well known to be one of the most effective methods of separating silver and gold from base metals and other impurities, as well
Although practices in vogue for many years are still employed in small-scale operations, decided advances have been made, particularly in the last decade and especially
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