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Roadside Mine (St. Francis Mine; Coyote claim), Pan Tak, Coyote District, Coyote Mts, Tohono O'odom (Papago) Indian Reservation, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 32° 2' 46'' North , 111° 30' 40'' West
Latitude & Longitude (decimal): 32.0461111111, -111.511111111
A former underground Cu-Ag-Au-Hg mine/occurrence located in West-central sec. 11, T.16S., R.8E. (San Vicente 15 minute topo map), North of the Coyote Mountains and 11½ miles SE of Indian village Schuchk. Owned by Randolph and Huntington. NOTE: Alternate coordinates provided: 32.01667N, 111.5W.

NOTE: Anthony, et al places this mine in the Roskruge Mountains; however, Heindl (1965) clearly illustrates and describes this mine as lying between the Roskruge Mountains and the Coyote Mountains, nearer to the latter, consistent with Keith Bull. 189.

Mineralization is disseminations, streaks, and fracture fillings of native copper, copper carbonates, oxides and sparse sulfides and sulfosalts with native mercury. All with quartz, calcite and epidote in strongly altered and kaolinized Laramide andesitic volcanics and Cretaceous (?) arenitic sediments along a strong fault zone cut by cross-fracture zones. Deep oxidation (to 800 feet) and reported aplitic or pegmatitic quartz monzonite cut at depth.

Workings include shaft operations. Originally developed prior to 1900 and further developed in 1920-1921. recent diamond drilling (circa 1970). No production reported but ore said to average about 3% Cu in place with good silver and minor gold values. Reportedly some spots of 0.8% Hg.

Mineral List

10 entries listed. 9 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 21, 28.

Beckman, R.T. & W.H. Kerns (1965), Mercury in Arizona, in Mercury potential of the United States, U.S. Bureau of Mines Information Circular 8252.

Heindl, L.A. (1965), Mesozoic Formations in the Comobabi and Roskruge Mountains, Papago Indian Reservation, Arizona, USGS Bull. 1194-H: H4 (Figure 1), H10-H11.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 117 (Table 4).

Nowlan, G.A., Haxel, G.B., Hanna, W.F., Pitkin, J.A., Diveley-White, D.V., McDonnell, J.R., Jr., and Lundby, W. (1989) Mineral resources of the Baboquivari Peak and Coyote Mountains Wilderness Study Areas, Pima County, Arizona, Chapter E, in Mineral resources of Wilderness Study Areas: Southwestern and south-central Arizona: U.S. Geological Survey Bulletin 1702-E, p. E1-E30.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 13 (Table 1).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 103, 175.

USGS San Vicente Quadrangle topo map.

Arizona Bureau of Mines file data, circa 1973.

MRDS database Dep. ID file #10039656, MRDS ID #M050591; and, Dep. ID #10090668, MRDS ID #D002419; and, Dep. ID #10161951, MAS ID #0040191113; and, Dep. ID #10283783, MAS ID #0040190376.

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