Latitude: 31°37'37"N
Longitude: 110°50'38"W
‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 230-231.
Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 15, 28.
Rohrbacker, R.T. (1964) Geology of the Temporal Gulch-Mansfield Canyon area, Santa Cruz County, Arizona: Tucson, University of Arizona, M.S. thesis, 81 p.
Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 89 (Table 4).
Arizona Bureau of Mines file data.
A Pb-Ag-Cu-Au-Zn mine located on 7 claims in the NE ¼ sec. 7, T.21S., R.15E., about 1 mile NW of the American Boy Mine, near the head of a north-side head tributary of Mansfield Gulch, at an elevation of about 5,500 feet. Known as early as 1880. Discovered in workable amount in 1905 by John Leek. Owned at times, or in part, by the Presidential Mining Co.; John Leek & associates (1905-1909); William Kemp, of Tucson (1909- ); Calumet Arizona Co.; Ferguson; the McDonald Mining Co.; Colonel O.P. Posey (circa 1915); and, Altamirano & Matrecita.
Mineralization is lensing quartz-fissure veins (American Boy lode) containing brecciated wall rock and shoots and stringers of massive, granular, and crystalline pyrite, other sulfides and sulfosalts, with minor calcite and hematite plus some spotty sphalerite. The wall rock is Triassic monzonite intruded by Jurassic granite.
Country rock is quartz monzonite cut by rhyolitic dikes, with which the deposits are associated. It is a fine-grained, very dark iron-gray rock that weathers reddish and is moderately porphyritic. It contains magnetite and hematite, also chlorite derived from the hornblende and biotite. It is traversed by a sheeting which dips steeply to the south, about parallel with the veins, and by a more pronounced sheeting that strikes a little west of north and dips steeply to the east or stands vertical.
The property contains 3 veins which lie about parallel and dips 75ºS. Each vein is associated with the footwall side of a rhyolite dike. From the south, or main, vein, the middle vein lies 30 feet distant and the north vein 140 feet.
The south vein, on which nearly all the development work has been done, is from 8 to 15 feet in width, and just west of the shaft is marked by croppings of brecciated and honeycombed hematite- and limonite-stained quartz, rising boldly 8 feet above the surface. It reportedly carries a 4 foot wide oreshoot which averages about 12½% Cu and contains some Ag & Au.
The ore is siliceous and occurs in part as metasomatic replacement deposits in the rock. It contains mainly fine-grained sulphides and sulphosalts.
Workings include a 40 foot deep shaft (circa 1905). Developed to a depth of 215 feet by shafts, drifts, crosscuts, and stopes aggregating about 1,000 feet or work. Levels are about 100 and 200. Workings on the south vein include the 215 foot, double-compartment shaft inclined 75º and a few hundred feet of drifts extending each way, with crosscuts and stopes on the 100 and 200 levels. The middle vein is opened by an 80 foot deep shaft, all in ore, and a crosscut near surface. Only a little surface work had been done on the north vein (circa 1915). Worked in the 1880's and sporadically through 1936. The group produced some 450 tons of ore averaging about 15% Pb, 9% Cu, 9 oz. Ag/T and 0.4 oz. Au/T.
Mineral List
9 entries listed. 9 valid minerals.
The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.
Mineral and Locality Search
