Structure: thrust faults, N-trending faults Country rocks strike N-S and dip steeply east and are strongly crumpled.

Alteration: silicification

Commodity: Ore Materials: gold, silver sulfides, galena, sphalerite, chalcopyrite, pyrrhotite, molybdenite, oxide copper minerals, tetrahedrite, chalcocite, manganese oxides Gangue Materials: garnet, diopside, vesuvianite, calcite, orthoclase, quartz, pyrite, limonite, chalcedony, iron-manganese oxides, sericite, hematite, limonite

Deposit: Silicified fault zone mineralized with gold and silver values in a brecciated, iron-stained, manganese-stained quartz gangue. In 1908, Ransome described the Adelaide Mine ore as a replacement of limestone by pyrrhotite, chalcopyrite, sphalerite , and minor galena in a skarn gangue of garnet, diopside, vesuvianite, calcite, orthoclase and minor quartz. There was a large body of ore averaging about 3 % copper. About 45,000 tons of this material was subsequently mined. The Crown Vein in the Adelaide Crown Mine trends N-S, dipping 70 west and was up to 80 feet thick. Gold and silver occur within the iron-manganese-stained brecciated quartz vein. This deposit may actually be more like a sediment-hosted, quartz-adularia precious metal deposit.

Deposit type: Polymetallic veins

Development: The Gold Run- Adelaide area was first prospected in the 1860s, and the district was organized in 1866. In 1868, an 8-stamp amalgamation mill was built to treat ore from nearby mines and in 1889, some copper was produced at Adelaide. In 1897, Glasgow and Western Exploration Co. acquired the main Adelaide mines and built a narrow gauge railroad from Adelaide to Golconda, and a concentrator and smelter were built at Golconda. The smelter operated continuously from 1898 to 1905 and the mill ran for 1 1/2 years, but both mill and smelter were scrapped in 1911. The original town of Adelaide was 1.5 miles east of its present location, moved in the 1930s. The Adelaide mines were bought by Yerington Mountain Copper Company, who operated ifor several years during W.W.I and intermittently until after 1937. Placer gold was discovered along Goldrun Creek in 1886, and the placers were sporadically worked for many years. The Adelaide mine operated from 1860s to 1940 and yielded the major portion of the gold, silver, copper and lead produced in the district. There was a flurry of exploration activity in the mid-1960s, by Bear Creek, and Union Carbide, among others. The district was prospected for molybdenum in early 1970s. Gold, silver, and copper production began again in 1980, with Bullion Monarch Company owning a 50% interest in M. and B. Mining Co. In October 1980, about 1000 tons of ore had been recently mined, stockpiled, and readied for delivery to Monarch's 200 tpd flotation mill at Austin. The district mines were inactive again when inspected in 1984, but a considerable amount of recent drilling had been done in the area south of the Adelaide mining by Exxon for precious metals. Shallow stopes indicate probable small gold production. Exploration interest in the district revived in the 1990s. Icarus Exploration Company mined and heap-leached ore - probably in 1990-1991 from Adelaide mines. Operators in 1990 as Gold King Nevada, Inc. employing a total of 42 employees and producing 3068 ounces of gold and 37,537 ounces of silver. In 1997, Altaur Gold took an option to purchase the Adelaide Crown gold property, at that time an advanced stage, fully permitted project with a proven reserve of 25,000 oz of gold and a drill-inferred resource of about 200,000 oz. Altaur planned to confirm the in-ground resource and increase its land holdings in the area before making a production decision. Also in 1997, White Knight Resources secured an agreement with North Mining to explore their Rock Creek Ranch property located between the Adelaide Crown Mine and Kramer Hill to the northeast. This area contains large areas of silicification and jasperoid development. In 1999, North Mining Inc. drilled two core holes in the property, designed to test geochemical targets identified by earlier trenching and rotary drilling. Both holes targeted more receptive host rocks of the Comus and Preble Formations beneath Valmy Formation rocks with the potential for a deeper sediment-hosted deposit. Also in 1999, Western Exploration planned 11 reverse circulation drill holes and 4,800 feet of road construction on its LNL claims near Adelaide. In 2000, Aur Resources optioned a part of Franco-Nevada's Adelaide claims on the southern part of the Getchell trend and, following mapping and sampling last year, planned a drilling program on the property. Newmont acquired Franco-Nevada Mining in 2002, and assumed ownership of that company's properties.

Ore(s): north-trending fault zone containing the Crown vein

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15 valid minerals.

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