The Mining Magazine, Volume 23

acid Africa amount anodes assay average British Broken Hill Carboniferous cassiterite cathode chalcopyrite Christy clay coal concentrate considerable Consolidated contains copper cost cross-course cyanide cyanide solutions Deep deposits depth district dividend Dredging east electric electrodes electrolytic Engineering fault furnace Geological Survey gold granite Hollinger iron issue July June labour laccolith Lake lead less tax lode London Long tons magma ment metal metallurgical method mill minerals mines Modderfontein molybdenite month nickel Nigeria norite obtained Ontario operations ore-bodies output owing oxide particles pipes plant Porcupine precipitation present production profit pyrites pyrrhotite quantity quartz Reef Rhodesia rocks sample schist shaft shares shows silver Skiddaw Slates smelting South South Crofty stephanite stoping Sudbury sulphate sulphide sulphur surface tetrahedrite tion Tons Tons Transvaal veins West Wheal Kitty width zinc