Franklin-Cushing & Marion Mine group (Rosemont group; Lewisohn Estate), Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA
This page is currently not sponsored. Click here to sponsor this page.
|Latitude & Longitude (WGS84):||31° 49' 59'' North , 110° 45' 50'' West|
|Latitude & Longitude (decimal):||31.8330555556, -110.763888889|
|Other regions containing this locality:||Sonoran Desert, North America|
Ref.: Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 126 (Table 4).
USGS Sahuarita Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10137946, MAS ID #0040190226.
A former underground Cu-Ag-Au mine group located in South-central (SW¼SE¼) sec. 25, T.18S., R.15E, on private land. Owned by the Lewisohn Estate, then ASARCO from 1988. These patented claims are part of the Helvetia property owned by ASARCO (1992).
Mineralization is a fissure vein with relatively small, spotty, irregular, and shallow pyrometasomatic deposits of copper carbonates and minor sulfides in thrust-faulted, silicated, Paleozoic limestone blocks.
Workings include tunnel operations. Produced some 150 tons of ore averaging about 4% Cu and 2 oz. Ag/T in 1944.
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.