|Latitude & Longitude (WGS84):||32° 6' 38'' North , 110° 3' 48'' West|
|Latitude & Longitude (decimal):||32.11056,-110.06333|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
A former medium output surface and underground Cu-Ag-Pb-Au-Zn-W-Mo-Be-Wollastonite mine located in the SE ¼ sec. 23 and sec. 26, T.15S., R.22E. (Dragoon 7.5 minute topo map), ½ mile NNE of the town of Johnson. Discovered 1880. First produced 1881. Operated at times, or in part, by the Johnson Copper Development Co.; the Coronado Copper & Zinc Co. (1973); and the Cyprus Johnson Copper Co. (1988). Owned and operated by Arimetco International, Inc. (1994).
Mineralization is copper carbonates with some bornite in pyrometasomatic replacement deposits and in tactite in Cambrian Abrigo, Mississippian Escabrosa, and Pennsylvanian Horquilla limestones. An associated rock unit is the Texas Canyon Quartz Monzonite. Ore control was favorable beds intersected by faults and the protrusions of Texas Canyon Quartz Monzonite into sedimentary rocks. Ore concentration included 30% enrichment by supergene processes; oxidation. Alteration was quartz veining of quartz monzonite with muscovite-silica-pyrite and argillic envelopes; sericitization. The ore zone is bedded and tabular at 610 meters long, 200 meters wide and 700 meters thick, striking N45W and dipping 37E. Copper carbonates occur at surface and copper sulfides at depth. Significant ore bodies may occur at depth where favorable beds of the Abrigo formation make up the hanging wall of the Republic Fault. Most of the ore came from replaced beds in Abrigo and Escabroza Formations. Assay data: ^ 12.5% Cu (1905); ^4 oz Au/St, 1.67% Cu, 6.1% Zn (1984).
Local structures include NW Tertiary block faulting including the Republic Fault. Massive fracture systems trend Ne, E, and NW.
Workings includes shaft(s). The property was opened by a 460 foot deep shaft and a 640 foot winze which is sunk on a 40 degree angle. An 18 foot sulfide vein carrying 1% Cu was opened in the winze in 1992. Workings total 365.76 meters long and 259.08 meters deep. There were heap and dump leaching operations. Capacity was 30,000 pounds of Cu per day. A total of 207 tons of ore were produced intermittently from 1901 to 1930.
44 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
|Quaternary - Miocene|
0 - 23.03 Ma
|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. 
|Serpukhovian - Early Cambrian|
323.2 - 541 Ma
|Mississippian, Devonian, and Cambrian sedimentary rocks|
Age: Paleozoic (323.2 - 541 Ma)
Description: Brown to dark gray sandstone grades upward into green and gray shale, overlain by light to medium gray or tan limestone and dolostone. This unit includes the Tapeats Sandstone, Bright Angel Shale, Muav Limestone, Temple Butte Formation and Redwall Limestone in northern Arizona, and the Bolsa Quartzite, Abrigo Formation, Martin Formation, and Escabrosa Limestone in southern Arizona. These rocks record intermittent sea-level rise and inundation in early Paleozoic time. (330-540 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.