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Backbone Mine, Las Guijas Mts, Arivaca District (Las Guijas District), Las Guijas & San Luis Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 35' 33'' North , 111° 20' 27'' West
Latitude & Longitude (decimal): 31.59250,-111.34083
GeoHash:G#: 9t8gdrhpd
Other regions containing this locality:Sonoran Desert, North America
Locality type:Mine
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: 104 (Table 4).

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039620, MRDS ID #M050510; and, Dep. ID #10184054, MAS ID #0040190110.

A former small underground Au-Ag-Pb-Zn-Cu mine located in the center of sec. 8, T.21S., R.10E., 3 miles N of Arivaca. Produced 1932-1942. Owned at times, or in part, by the Backbone Mining Co.; and, Walsh. NOTE: Alternate coordinates provided: 31.6142N, 111.3411W.

Mineralization is irregular quartz-fissure lenses with spotty auriferous and argentiferous galena and othe sulfides in Laramide granitic intrusives. Near surface enrichment of gold and silver by oxidation and weathering.

Workings include a shaft(s) to a depth of 41.15 meters and length of 91.44 meters. Worked from the 1930's into the 1940's. Produced some 140 tons of ore averaging about 0.5 oz. Au/T, 0.8 oz. Ag/T, traces of Cu and 1% Pb. The zinc was not recovered.


Mineral List


3 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 - Toarcian
145 - 182.7 Ma



ID: 2778737
Jurassic granitic rocks

Age: Jurassic (145 - 182.7 Ma)

Description: Granite to diorite, locally foliated and locally alkalic; includes Triassic(?) granitoids in the Trigo Mountains. This unit includes two dominant assemblages of igneous rocks. The Kitt Peak-Trigo Peaks superunit includes, from oldest to youngest: dark, foliated or gneissic diorite, medium-grained equigranular to porphyritic granodiorite, and small, irregular intrusions of light-colored, fine-grained granite. The Ko Vaya superunit, limited to south-central Arizona, includes texturally heterogeneous K-feldspar-rich granitic rocks. (150-180 Ma)

Lithology: Major:{diorite,alkali granite,granodiorite}

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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