Turquoise District (Courtland-Gleeson District), Dragoon Mts, Cochise Co., Arizona, USAThis page is currently not sponsored. Click here to sponsor this page.
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A Pb-Ag-Au-Cu-Zn-Mn-Quartzite-Turquoise mining district located in T.19, 20S., R.24, 25E. This District is located about 18 miles NE of Tombstone and 20 miles north of Bisbee. It occupies an area about 4 miles long from north to south by 2 miles wide in the southeastern margin of the Dragoon Mountains.
The principal features of relief are two ridges of NNW-ward trend, fringed on the east by low foothills. The northern, Turquoise Ridge, is separated from the southern, Gleeson Ridge, by a narrow gulch. These ridges are each about 2 miles long by less than a mile wide, and they rise 900 to 1,200 feet above the adjacent plains.
The structure at Gleeson and Courtland is highly complex due to faulting and igneous intrusions.
Quartz monzonite and quartz-monzonite porphyry intrude the Paleozoic and older rocks but were not found affecting the Cretaceous. Granite and felsite cut the monzonites, and the granite invades the Cretaceous beds.
The strata of Turquoise and Gleeson ridges predominantly strike between N. and N30ºE., and dip steeply eastward, but locally they show considerable variations in altitude.
Steeply dipping faults of general northerly and easterly trends are common in the district. Movement on them has been both vertical and horizontal, and locally they displace the low-angle faults.
Mineralization is of several types: (1) Copper carbonates and oxides in irregular blanket deposits where Cambrian Bolsa Quartzite and Abrigo Limestone are thrusted over Carboniferous limestone; copper sulfides, oxides, and carbonates in irregular replacement deposits in Cambrian Abrigo Limestone; and copper sulfides, oxides and carbonates in irregular, tabular, pyritic lenses in Carboniferous limestone along, or close to, a contact with quartz monzonite intrusive; (2) Lead and zinc carbonates, lead sulphate, and zinc silicate with silver chloride, manganese and minor copper and gold in irregular orebodies in Pennsylvanian-Permian Naco Group limestones along, and at intersections of, fractures and faults; (3) Turquoise in near-surface stringers and lenses in altered granite and quartzite; (4) Manganese oxides in irregular bunches, lenses and masses along fractures in limestone; and (5) Spotty and weak base metal ores with gold and silver values in veins in intrusive rocks.
Workings include numerous mines and prospects developed by shafts, tunnels and adits since 1883. At least 887,000 tons of base metal ore and some 250 tons of manganese ore were produced plus some turquoise and a considerable production of quartzite smelter flux.
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89 entries listed. 67 valid minerals.
Localities in this Region
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