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M.C.M. Mine group (MCM Mine; Guadalupe group), San Luis Mts, Arivaca District (Las Guijas District), Las Guijas & San Luis Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 32' 13'' North , 111° 20' 2'' West
Latitude & Longitude (decimal): 31.53694,-111.33389
GeoHash:G#: 9t8g6t1hh
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Ref.: Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 106 (Table 4).

U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology file data.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10026921, MRDS ID #M001076; and, Dep. ID #10210533, MAS ID #0040190312.

A former small surface Ag-Au-Pb-Cu-Zn mine located in the SE ¼ of sec. 5, T.22S., R.10E., 2½ miles S of Arivaca and ¼ mile S of the Ajax Mine. Produced 1900-1933. Owned at times, or in part, by the MCM Mining & Milling Co.; Rowcroft; Crawford; Guadalupe Mining Co.; and the Leda Mines Consolidated.

Mineralization is partly oxidized argentiferous galena and other sulfides, in lensing quartz-fissure veins cutting metamorphosed Cretaceous sedimentary formations. Surface weathering present.

Workings include relatively shallow openings worked intermittently from prior to 1900 to 1933, producing some 100 or more tons of ore averaging about 63 oz. Ag/T, 1 oz. Ag/T, 10% Pb and 4% Cu.


Mineral List


4 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]

Campanian - Oxfordian
72.1 - 163.5 Ma



ID: 2847779
Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks

Age: Mesozoic (72.1 - 163.5 Ma)

Stratigraphic Name: Temporal Formation; Bathtub Formation; Sand Wells Formation; Fort Crittenden Formation; McCoy Mountains Formation

Description: Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 Ma)

Lithology: Major:{arenite,conglomerate}, Minor:{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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