Silver Bill Mine, Costello Mine group (Costello claims), Gleeson, Turquoise District (Courtland-Gleeson District), Dragoon Mts, Cochise Co., Arizona, USA
|Latitude & Longitude (WGS84):||31° 44' 33'' North , 109° 49' 19'' West|
|Latitude & Longitude (decimal):||31.74273,-109.82200|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
A former small underground Pb-Zn-Ag-Cu-Au-Mo-Mn-Gemstone mine located in the North-central sec. 32, T.19S., R.25E. (Outlaw Mountain 7.5 minute topo map), on the west slope of Gleeson Ridge, immediately north of the Tom Scott Mine, approximately 100 yards (95 meters) SE of the Defiance Mine, ¾ mile (1.2 km) NE of Gleeson, and about 25 km East of Tombstone. Discovered 1890. Produced 1893-1978. Owned/Operated by the Gleeson Heights Minerals Co. (1978).
Mineralization is irregular, small stringers, pockets, and replacement bodies of oxidized base metal sulfides in Pennsylvanian-Permian Naco Group limestone adjacent to a quartz monzonite porphyry contact. Ore control was faults and fractures in the limestone; also along the dike perpendicular to bedding, and the contact of the limestone and intrusive bodies. Ore concentration was strong oxidation, resulting in the redeposition of malachite and azurite. Associated rock units are the Gleeson Quartz Monzonite and the Sugarloaf Quartz Latite Porphyry.
Workings are within a relatively elevated block bounded on the north and south by two subparallel faults which strike N.65º to 80ºS. This block ranges in width from approximately 50 feet at the surface to 80 feet on the 200 level.
Local structures include an eastward-dipping fault, possibly a segment of the Tom Scott fault zone, extending northward through the collar of the shaft. The limestone near the quartz monzonite contact strikes N30W, 40-50NE, N50-80E with a 40-80 dip. Faults cut by another fault system at right angles.
Workings are 160 meters long and 53.34 meters deep and include an inclined shaft 271 feet deep, together with several hundred feet of drifts, winzes, and stopes. The bottom or 200 level connects with the Mystery adit. A large tonnage was mined during the late 1800's. 6,570 tons were produced during the periods 1922-1930 and 1938-1941.
25 valid minerals.
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
|Tithonian - Toarcian|
145 - 182.7 Ma
|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)
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.