The Geology and Gold Mineralization of the Twin Creeks Gold Deposits, Humboldt County, Nevada
Ronald F. Thoreson, Mark E. Jones, Fred J. Breit,, Jr., Micheline A. Doyle-Kunkel, Lori J. Clarke, 2000. "The Geology and Gold Mineralization of the Twin Creeks Gold Deposits, Humboldt County, Nevada", Part I. Contrasting Styles of Intrusion-Associated Hydrothermal Systems: Part II. Geology & Gold Deposits of the Getchell Region, John H. Dilles, Mark D. Barton, David A. Johnson, John M. Proffett, Marco T. Einaudi, Elizabeth Jones Crafford
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THE NEWMONT MINING Corporation Twin Creeks mine is located 45 mi northeast of the city of Winnemucca, Nevada in Humboldt County. Access to the property is east from Win-nemucca, along Interstate 80, 16 mi to Golconda then northeast out of Golconda along State Route 789 for 17 mi. At the Midas-Getchell intersection follow the well-maintained dirt road for 12 mi past the Pinson and Getchell mines to the Twin Creeks property (Fig. 1). The Twin Creeks mine is the third largest primary gold-producing mine in North America and includes the Mega, Vista and West pit disseminated Carlin-type gold deposits. In 1999, the mine produced 760,574 oz from an oxide and sulfide milling and oxide leaching operation. Twin Creeks currently employs approximately 650 employees.
Oxide ores at Twin Creeks are processed at a rate of 2,800 tpd through the Juniper Mill. The leach-grade material is processed through three leach pads. Sulfide ores at Twin Creeks are processed through the $250 million Sage Mill, which incorporates two of the largest autoclaves used in the gold industry. Start-up of the first 4,000 tpd autoclave occurred in May of 1997; the second autoclave, of the same size, began operation in November of 1997. The sulfide project enables Twin Creeks to process refractory ores that contain approximately 4.05 Moz of gold, about 59% of the total Twin Creeks’ reserves. Current reserves at Twin Creeks are 87,112,000 tons at an average grade of 0.079 oz/st and contains 6,857,000 oz of gold.