Blow Out Mine, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA
|Latitude & Longitude (WGS84):||31° 56' 27'' North , 110° 42' 51'' West|
|Latitude & Longitude (decimal):||31.94083,-110.71417|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
‡Ref.: Wilson, E.D. (1941), Tungsten Deposits of Arizona, Geological Series No. 14, Arizona Bureau of Mines Bull. 148: 41.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 123 (Table 4).
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 11 (Table 1).
USGS Empire Mountains Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10026778, MRDS ID #M000216; and, Dep. ID #10283499, MAS ID #040190132.
A former small surface and underground Cu-Ag mine group located in the NW ¼ sec. 21, T.17S., R.16E. (Empire Mts 15 minute topo map), 25 miles SE of Tucson. Produced in the mid 1950's. Owned at times, or in part, by Cardiello & Serasio; and the Aricu Mining Co.
Mineralization is spotty secondary copper minerals and sulfides with sooty magnetite along fault and fracture intersections in a silicified, garnetized, and epidotized Paleozoic limestone block engulfed in Laramide intrusive. Ore control was fault and fracture intersections.
Workings include tunnels, shafts, and open cuts. Some 150 tons of ore averaging about 3.5% Cu and 2 oz. Ag/T were produced in the mid-1950's.
6 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
|Ypresian - Campanian|
47.8 - 83.6 Ma
|Early Tertiary to Late Cretaceous granitic rocks|
Age: Phanerozoic (47.8 - 83.6 Ma)
Description: Porphyritic to equigranular granite to diorite emplaced during the Laramide orogeny. Larger plutons are characteristically medium-grained, biotite +/- hornblende granodiorite to granite. Smaller, shallow-level intrusions are typically porphyritic. Most of the large copper deposits in Arizona are associated with porphyritic granitic rocks of this unit, and are thus named 'porphyry copper deposits'. (50-82 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.