The Main Tintic Mining District
Gemini Ore Run
(295 Acres Patented Mining Claims)
Situated in Juab County, 70 miles SW from Salt Lake City, in the mining friendly State of Utah. The Main Tintic District ranks 4th in underground precious metals districts in the U.S. The Main Tintic underground mines are characterized as requiring minimal underground rock support, temperatures about 75 degrees, with a deep water table. 90% of production has come from large dimension replacement ore bodies in carbonate rocks, which are amenable to modern mechanized underground mining. Infrastructure including electrical and transportation are in place. Highway US-6 passes through. Union Pacific Railroad is adjacent on the west. DO NOT CONFUSE with the nearby East Tintic Mining District in Utah County—which has very different and much less favorable mining characteristics. Since 1900, When the U.S. Bureau of Mines began keeping records, the Main Tintic District has produced 13 million tons of ore, from which was recovered: 208 million ounces silver; 2.2 million ounces gold; 247 million pounds copper; and 1,318 million pounds lead. No production figures are available from 1872, when mining began, to 1900. Production had ended at all Tintic District metal mines prior to 1958 as a result of low metals prices, and antiquated mining methods—not for lack of ore. Little modern exploration has been carried out, and numerous high potential ore targets remain untested. Conflicting and fragmented property ownership has negatively hampered exploration and mine development. Property ownership of major mines has now been consolidated. The Main Tintic Mining District remains a “SLEEPING UNDERGROUND GIANT.”
Background and Information
Centennial Eureka Mine ~1917
The Gemini Ore Run extends from the Grand Central Mine in the south to the Gemini Mine in the north, a distance of over 8,000 feet. Examination of past production sheets and mine working locations demonstrates a pronounced zoning from copper/gold, to lead/silver, to lead/zinc, from the south to north. Mineralization in the Gemini Ore Run is hosted by the Ajax, Ophir, and Bluebell limestone formations. Ore chimneys account for the bulk of the production from the Centennial-Eureka Mine, and are located where north-south mineralized structures, intersect a series of south dipping, east striking, "cross breaks" or faults. North of the Centennial Eureka Mine, through the Eureka Hill Mine, the Gemini Ore Run is composed of a series of separate lenticular ore shoots lying along steep bedding planes.
The Gemini Ore Run is well defined throughout the mine workings. Available information suggest that only economic factors, such as encountering the water table, labor problems, and boundary disputes caused the closure of these mines. Present data indicate that the Gemini Ore Run can be extended laterally as well as northerly and southerly.