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Ajax Mine 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' 28'' North , 111° 20' 16'' West
Latitude & Longitude (decimal): 31.54111,-111.33778
GeoHash:G#: 9t8g6myk3
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: 103 (Table 4).

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039619, MRDS ID #M050509; and, Dep. ID #10259099, MAS ID #0040190089.

A former small surface and underground Au-Ag-Pb-Zn-Cu mine on 5 unpatented claims, located in center of East SE ¼ sec. 5, T.22S., R.10E., 2¼ miles S of Arivaca. Produced 1927-1941. Owned at times, or in part, by the Arivaca Gold Mining & Milling Co.; the Ajax Mining Co.; and the Oreona Mining Co. Operated by Ms Evelyn Watkins of Tucson (1965).

Mineralization is argentiferous and auriferous galena, and other sulfides in irregular, lensing quartz-fissure veins (4 veins, 8 to 40 inches wide) cutting metamorphosed, Cretaceous, sedimentary formations. Oxidized near the surface with enrichment of gold and silver. The main vein occupies a contact fissure between quartzite and limestone. The ore body is 1.02 meters wide.

Workings include shallow shafts, cross-cut, with tunnels and stopes, and open cuts, totaling 365.76 meters in length and 51.82 meters deep. Operated from 1927 through 1941. It produced some 200 tons of ore averaging about 0.6 oz. Au/T, 15 oz. Ag/T, 0.7% Cu, and 4% Pb. Considerable zinc was not recovered.


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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