the mine was originally one of the world's major low-cost gold producers, but operating costs have increased. in 2004 it produced over one million ounces of gold at a cash cost of us$192 per ounce. its output fell to about 865,000 ounces in 2005, and has reached 572,595 ounces of gold at cash costs of us$515 per ounce in 2009.
the cortez joint venture built the pipeline mine and mill in early 1996 following a series of ownership disputes with junior mining companies. commissioning of the pipeline mine cost us$250 million, and resulted an annual output between 1998 and 2005 of over one million ounces of gold per year. the cortez hills deposit was discovered in 2002 .
the mill contained 10 stamps with 4 large frue vanners, and when running at full capacity, 10 tons of rock were milled per day at a cost of us$0.50 per ton. an 18 inches 460 mm pipe 1,200 feet 370 m in length brought the water from a flume, the lower end of which is 187 feet 57 m above the power plant, and with the aid of two pelton wheels , 170 horsepower were generated.
the galena mine also has an operating 1,100 ton per day flotation mill, maintenance shop, carpenters shop office and dry facilities. the mine utilizes conventional and mechanized cut and fill mining methods with sand backfill to extract ore from the high grade silver-copper vein deposits that constitute the majority of the ore reserves.
the mine has a production target of 70,000 to 80,000 ounces per annum with a throughput of approximately 320,000 tonnes of ore per annum. a number of the components of the plant were second-hand, including a ball mill from the higginsville gold mine.
the mine has a production target of 70,000 to 80,000 ounces per annum with a throughput of approximately 320,000 tonnes of ore per annum. a number of the components of the plant were second-hand, including a ball mill from the higginsville gold mine .
the price of uranium dropped between 2007 and 2009. in 2009 it cost more per pound to mine the uranium than it could be sold for and, as a result, the last working uranium mine closed that year. 2008 gold gold hill the only working underground mine in colorado in 2008 was the cash mine, built in 1872, at gold hill in boulder county. each ton of .
simmer and jack mines ltd until 1924 known as the simmer & jack gold mining co. ltd. is a south african company which was founded in 1887 by the german august simmer and scotsman john jack, shortly thereafter selling the majority shareholding to gold fields of south africa ltd.