Show SOUTH DAKOTA production IN 1915 the mine production of gold from south dakota in 1915 was compared with in 1914 and that of silver was ounces compared with ounces in 1914 A nominal quantity of lead was produced these are preliminary estimates reported by charles W henderson of the united states geological survey since 1876 south dakota has produced in gold and 6 ounces of silver the homestake Home stake mine and amalgamation mills were operated continuously throughout the year with an increased output the golden reward mill was operated steadily on siliceous ore from its mines and during the later part of the year an additional product was sent to the mill in the form of roasted sulphide or blue ore these sulphide ores had never before been treated successfully by results indicate 90 per cent extraction as compared with 35 per cent without roasting sulphide ore of sufficient grade is sent to smelters shelters sm elters the mill was operated steadily on company and custom ore with an increase in capacity the reliance mill was also operated steadily on company and custom ore the trojan mine and mill was operated regularly the wasp no 2 company continued to operate its dry crushing mill the mine being worked by the open cut system using a steam shovel for stripping the bismarck mine and mill were idle the new 50 ton mill on the rattlesnake jack mine was operated during part of the year sinking continued at the oro hondo property A small production of placer gold was made in custer lawrence and pennington counties in pennington county experimental milling was continued on the gold antimony iron lead zine zinc ores of the home lode company at silver city and development work was done on properties near hill city the dredge at mystic on castle creek was moved to the john day district oregon |