GreenockiteSan Juan Mine, Gordon Camp, Middle Pass District, Dragoon Mts, Cochise Co., Arizona, USA
Latitude: 31°52'58"N
Longitude: 109°58'58"W
‡Ref.: Miller, C.P. (1913) unpublished notes of the San Juan group (available thru Colorado School of Mines Library): 1.
Trischka, C., et al (1929), Diatomite in Arizona, Engineering and Mining Journal: 127: 13-14.
Voelzel, C.W. (1942) U.S. Bureau of Mines Report file No. 464.2/1518. (on Dragoon Zinc reconnaissance) (unpublished): 8, 11.
Cederstrom, D.J. (1946) Geology of the central Dragoon Mountains, Arizona: Tucson, University of Arizona, Ph.D. dissertation, 93 p.: 88-89.
Cederstrom, D.J. (1946) The structural geology of the Dragoon Mountains, Arizona: American Journal of Science: 244(9): 601-621, 1 sheet, scale 1:31,680.
Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 20-23.
Burnham, C.W. (1959), Metallogenic provinces of the southwestern US and northern Mexico: New Mexico Bureau of Mines and Mineral Resources Bull. 65: 30.
Warner, L.A., et al (1959), Occurrence of non-pegmatite beryllium in the United States, USGS PP 318: 96.
Cooper, J.R. (1962) Bismuth in the United States, exclusive of Alaska and Hawaii: U.S. Geological Survey Mineral Investigations Resource Map MR-22, 19 p., 1 sheet, scale 1:3,168,000: 4.
Meeves, H.C. (1966), Nonpegmatite beryllium occurrences in AZ, CO, NM, UT and four adjacent states, US Bureau of Mines Report of Investigation 6828: 56.
Shawe, D.R. (1966), AZ-NM-NV-UT beryllium belts, USGS PP 550-C: 206-213.
Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geol. Sur. Branch Bull. 187, Index of Mining Properties in Cochise Co., AZ: 69 (Table 4).
Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.
Chatman, M.L. (1993) U.S. Bureau of Mines Open File Report Mineral Land Assessment (MLA) 30-93: 26-28, D60-D73.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 133, 239, 245, 368, 374.
MRDS database Dep. ID file #10009832, MRDS ID #D003068; and, Dep. ID #10161252, MAS ID #0040030205.
A former medium-sized underground Zn-Pb-Ag (Bi-Be-Li-Ga-Cd) mine located on 14 claims in the center of sec. 10, T.18S., R.23E., west-central part of the Dragoon Range, about ½ mile south of China Peak. Discovered 1913. Produced 1913-1952. Held by Jonathan Gordan for many years (as of 1951). This mine is on the west side of a southeastward-trending gulch, at an altitude of approximately 6,400 feet.
In the ridge at the mine the succession of rocks, from lowest to highest, is exposed: Quartzite, light-colored and fine-grained, of Permian aspect, approximately 60 feet thick; gray shale, in part siliceous or novaculitic, with some impure limestone beds, locally metamorphosed to epidote, garnet, and other silicates (tactite), approximately 40 feet thick; bluish-gray limestone conglomerate and limestone, separated from underlying beds by low-angle fault, approximately 30 feet thick; thin-bedded, dark to brownish shale, in part sandy, caps eastern slope of the ridge. Presumably the conglomaritic limestone and overlying shale are Cretaceous.
The prevailing southeastward dip of the beds is modified by broad, low flexures in the mine. Also, faults which trend N.30ºW. and N.70ºE. have effected relatively small displacements. The side gulch immediately south of the mine apparently marks the location of a fault trending N.65º to 70ºW. and with its northern side downthrown. The main gulch east of the mine presumably marks a fault of northward trend, with its west side downthrown. Granite invades the sedimentary series on the west.
Mineralization is a wedge-shaped ore body hosted in Abrigo Limestone and containing sulfides, iron oxides and helvite in irregular manto-type bodies of pyrometasomatic limy silicates in impure, shaly Abrigo Limestone, where it is cut by faults. Irregular masses of contact silicates replace the impure, shaly limestone beds beneath the conglomeritic limestone.
Workings prior to 1947 included more than 1,000 feet of workings, largely within the Sulphide and Silver connecting adits. Workings are chiefly from adit levels. The Silver adit extends northward and connects with the Sulfide adit which extends west and southward. These two tunnels, together with their drifts and stopes, are distributed through an area approximately 330 feet long by 100 feet wide. In addition, there is the Mistletoe adit witjh approximately 200 feet of workings, and several shiorted adits. Over 17,000 tons of ore were roduced since 1913 but mainly during the period 1947 and 1951.
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