Show COLORADO production IN 1913 the output of colorado minesforo mines for eleven months of 1913 with an estimate for december according to preliminary figures by charles W henderson of the united states geological survey shows a production of in gold ounces of silver pounds of lead pounds of copper and pounds of zinc in terms of spelter and zinc in zinc oxide with a total value of compared with in ill 1912 this shows a decrease of in gold an increase of ounces of silver an increase of pounds of lead an increase of pounds of Cop copper cippera pera and nd a decrease of pounds of zinc the heaviest decrease in value was for zinc and there were increases of for silver and for lead the tonnage treated by the glo globe be leadville pueblo and salida calida smelt eries showed an appreciable increase for the year an increased tonnage was also shipped to the murray garfield and midvale plants in utah cyanide precipitates were shipped to omaha the united states zinc com banys magnetic plant and at pueblo was operated steadily the output of cripple creek showed an increase of in gold the roosa roosevelt tunnel continued to lower the water level gradually in the vindicator and golden cycle mines electric pumps were installed lower levels were opened during an g the year |