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Crown King & Tiger Mine groups (Crown King and Tiger Mines), Esperanza Mine group [old], Pima District (Olive District; Mineral Hill District; Twin Buttes District), Sierrita Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 51' 45'' North , 111° 6' 20'' West
Latitude & Longitude (decimal): 31.86250,-111.10556
GeoHash:G#: 9t8vr8rks
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Ref.: Cooper, J.R. (1960) Some geologic features of the Pima mining district, Pima County, Arizona: U.S. Geological Survey Bulletin 1112-C, p. 63-103, 1 sheet, scale 1:31,680.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 134 (Table 4).

Copper Handbook (1908, 1912-1913, 1920).

USGS Twin Buttes Quadrangle topo map.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10026759, MRDS ID #M000103; and, Dep. ID #10113154, MAS ID #0040190186.

A former small surface and underground Pb-Cu-Ag-Zn-Au-Mo mine group located in South-central sec. 16, North central sec. 21, and West-central sec. 15, 16, & 21, T.18S., R.12E, 4 miles SW of Twin Buttes on private land. Owned at times, or in part, by the Chesterfield Copper Co.; Blanche Rose Mining Co.; and the Magnate Copper Co. Originally prospected in Spanish colonial times.


Mineralization is spotty base metal sulfides, partly oxidized, in irregular quartz veins along faults and fractures in Cretaceous sedimentary-volcanic formations intruded by Laramide quartz monzonite porphyry and andesite dikes and plugs. Alteration included partly oxidized, locally kaolinized and sericitized, slightly silicified areas. The Cretaceous rocks are Arkose, quartzite, conglomerate, shale, rhyolite, and graywacke.

Workings include numerous small shafts and pits. Worked intermittently from the early 1900's to about 1917. Produced some 360 tons of ore averaging about 7% Pb, 4% Cu, 13 oz. Ag/T and minor Au.


Mineral List


7 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary - Miocene
0 - 23.03 Ma



ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Tithonian - Bajocian
145 - 170.3 Ma



ID: 2847718
Jurassic sedimentary and volcanic rocks

Age: Jurassic (145 - 170.3 Ma)

Stratigraphic Name: Gardner Canyon Formation; Rudolfo Redbeds; Recreation Red Beds; Topawa Group; Harquar Formation

Description: Sandstone and conglomerate derived from volcanic rocks with associated intermediate-composition lava flows, breccias, and tuffs. In southern Arizona this unit includes rocks of the Artesa sequence, Pitoikam Formation, Mulberry Wash volcanics, Rudolfo Red Beds, Recreation Red Beds, and Gardner Canyon Formation. In western Arizona it includes the Harquar Formation, rocks of Slumgullion, and related(?) unnamed units in the Kofa and Middle Mountains. This unit is characterized by maroon, brown, and purplish-gray volcanic-lithic sandstone and siltstone, with subordinate to abundant conglomerate, quartz-rich sandstone and sparse limestone. (150-170 Ma)

Lithology: Major:{sandstone,siltstone,conglomerate}, Minor:{felsic volcanic,limestone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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