Show colorado metals in in 1917 the mine output of gold silver copper lead an and d zinc in colorado for eleven months of 1917 and the estimated output for december according to data compiled by charles W henderson of the united states geological survey department of the interior amount to about in gold ounces of silver pounds of recoverable lead pounds of copper and lbs ibs of recoverable zinc having a total value of nearly compared with in gold ounces of silver pounds of lead pounds of copper and pounds of zinc having a total value of 49 in 1916 this estimate shows a decrease of in gold ounces of silver and pounds of lead the production of copper showed a slight increase but that of zinc showed a decrease of about pounds with the increased average prices for silver and lead there was an increase of for silver and for lead the decrease in the value of zinc was nearly lead smelters shelters Sm elters of the state the lead smelters shelters sm elters in the state at globe leadville pueblo durango and salida calida were operated about as in 1916 the ore coming from arizona canada colorado idaho south dakota and other states and including a large quantity of zinc residues from kansas and oklahoma smelters shelters sm elters the notation flotation plant installed in 1916 at the durango smelter to remove the zinc from the zinc lead sulphide ores of the san juan region continued to be operated during 1917 the copper matting plants at ouray and vulcan were idle the united states zinc com banys magnetic wet concentration mill and zinc smelter at pueblo were actively operated on zinc ores from colorado and other western states the western chemical companas Comp anys acid plant and magnetic tion wet concentration mill at denver and the empire zinc companas Comp anys ton mag betic separation plant at canon city were operated steadily both treating chiefly leadville lead zinc sulphide ores the river smelting smelling Sm elting refining companas Comp anys plant at florence continued to treat zinc lead copper sulphide ores from several counties in colorado part of the product being forwarded to this companas comp anys electrolytic zinc plant at keokuk iowa the western zinc oxide plant at leadville was operated steadily on zinc carbonate ores copper ore and cyanide precipitates were shipped from colora colorado do to the smelter at omaha neb and some copper and lead ores oies were shipped to plants in utah decreased cripple creek production As predicted in the six months review of operations in colorado the production from cripple creek was less than in 1916 but the production during the last six months of 1917 was somewhat larger than during the first six months and the total production of cripple creek for the year was a decrease of during the year the roosevelt tunnel was continued so as to end at the portland mine not at the golden cycle vindicator mine as originally intended A crosscut was also started toward the cresson mine the portland company abandoned its plan of using the flotation process in its independence mill at vindicator and continued to use the cyanide process with considerably increased capacity the vindicator company continued its experiments with the flotation process the golden cycle mill at colorado city and the portland mill at colorado springs and victor were operated steadily the yield from the small cyanide plants of the cripple creek district was not so large as usual and the shipments of smelting smelling sm elting ore directly to amel fell off considerably lake county chiefly leadville but including also the lackawanna gulch sugar loaf st kervin and the lode districts and the arkansas river dredge dis brict produced in gold ounces of silver pounds of lead pounds of copper and pounds of zinc having a total value of 10 against in gold ounces of silver pounds of copper pounds of lead and pounds of zinc having a total value of 16 in 1916 shipments of manganese iron ore manganese silver fluxing flexing ore lead carbonate and zinc carbonate ores continued in increasing quantities from the downtown district in 1916 some zinc carbonate and zinc sulphide ores were shipped from the fryer hill district also in 1916 and considerable iron sulphide ores were shipped from the carbonate hill district the output of zinc carbonate from the leadville district decreased heavily the output of zinc carbonate was tons of per cent as compared with tons of 2152 per cent in 1916 the zinc sulphide smelt ing and concentrating ore was tons of per cent against tons of 2096 per cent in 1916 the derry ranch dredge below malta continued operations during the year the san juan region of dolores la plata ouray san juan and san miguel counties produced in gold 2556 ounces of silver pounds of lead pounds of copper and 0 60 pounds of zinc valued in all at against in gold ounces of silver pounds of lead pounds of copper and pounds of zinc with a total value of 7 in 1916 the san miguel county mills maintained their production of gold which was about and increased their production of silver to over ounces but considerable quantities of the ore treated in these mills came from operations in ouray county along the strike of the veins san juan county produced considerably sider ably less gold I 1 but made an appreciable increase in the output of silver and a large increase in the output of lead copper and zinc the yield of zinc in dolores county increased heavily but the yield of the other metals fell off somewhat in ouray county there was naturally a heavy decrease in the output of gold due to the idleness of the camp bird mill both the mine and mill having been closed down in august 1916 to await the completion of the low level adit which was driven steadily during 1917 this adit is to be feet long iong and will cut the camp bird feet below the present deepest workings and feet below workings of the next most important section boulder gilpin and cedar creek counties produced in gold ounces of silver pounds of copper pounds of lead and pounds of zinc as compared with in gold ounces of silver 1243 pounds of copper pounds of lead and pounds of zinc in 1916 boulder county produced less gold and less silver also less copper and lead clear creek county increased its output of silver lead copper and zinc but decreased considerably its output in gold the production of gold in gilpin county fell off approximately but there was an increase in the output of lead and for the first time in years there was an output of zinc in chaffee county the output of gold lead copper and zinc fell off but the output of silver increased the output of pitkin county aspen was ounces of silver and pounds of lead an increase of ounces of silver but a decrease of nearly pounds of lead the output of zinc from this county however increased approximately pounds the production of creede mineral county fell off considerably as did that of I 1 gunnison county summit county produced in gold ounces of silver pounds of lead pounds of copper and pounds of zinc as compared with in gold ounces of silver pounds of copper pounds of lead and pounds of zinc in 1916 the four gold dredges at breckenridge Breckenrid go produced about the same output as in 1916 but the output of pocket gold was not equal to that of 1916 during the latter part of the year a new dredge was launched in this district there was very little activity at montezuma but several properties continued to work at kokomo kokomos mining was very active at red cliff eat eagle ile county though the yield of zinc was somewhat less than in 1916 some shipments were made from the brush creek district the output from both lode and placer place f mines in park county decreased S the output from the mines of custer ousted county was the largest for several years 01 and there was also a considerably increased increase 01 production from the kerber creek district 1 of saguache county |