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New York Mine (Beuhman Mine; Beechman Mine; New York group of claims), Beuhman Hill, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 55' 59'' North , 110° 43' 26'' West
Latitude & Longitude (decimal): 31.93306,-110.72389
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BSk : Cold semi-arid (steppe) climate

‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 92, 137-138.

Lee, C.A., and Borland, G.C. (1935) The geology and ore deposits of the Cuprite mining district: Tucson, University of Arizona, M.S. thesis, 54 p.

Browne, J.F. (1958) Geology of the Cuprite mine area, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 39 p.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 43.

Hewett, D.F. (1964), Veins of hypogene manganese oxide minerals in the southwestern United States, Economic Geology: 59: 1429-1472.

Elevatorski, E.A. (1971), Arizona Fluorspar, Arizona Department of Mineral Resources, U.S. Bureau of Mines Report of Investigation 5651: 33.

Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 127 (Table 4).

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 224.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10103753, MRDS ID #M050489; and, Dep. ID #10210641, MAS ID #0040190002.

A former small underground Pb-Cu-Ag-Zn-Mo-Sb-Fluorspar mine located on 8 claims in the NE ¼ sec. 29 (9 ?), T.17S., R.16E., on the west slope of Beuhman Hill, ¾ mile west of the Cuprite Mine and 7 miles NE of Helvetia. Owned at times, or in part, by McMahon; and, the New York Copper Co. of Tucson.

Mineralization is partly oxidized lead, copper and zinc sulfides with quartz, calcite, fluorite, pyrite and manganese and iron oxides in irregular lenses in a shear zone in pyrometamorphosed Paleozoic limestone along the contact with Laramide quartz monzonite intrusive. The shear zone is 30 to 70 feet and trends N10-25W and dips 40W and to the north trends N50-80W and dips 45-60N. Alteration includes partial oxidation; silicated garnetiferous limestone and the strongly altered shear zone. The ore zone is 60.96 meters wide, strikes NNW and dips 75SW.

The country rock is principally silicated garnetiferous limestone, freely intruded by fine-grained, dark diorite and granite porphyry.

The mine is on a north-northwest mineralized contact and shear zone about 200 feet wide between the intrusive diorite and limestone, and near by is a large granite porphyry dike with which it is thought to be genetically connected. The zone locally contains much calcite, epidotized quartz, manganese, iron oxide, pyrite, chalcopyrite, and some copper carbonates, some bodies of which range from 2 to 4% Cu.

On the slope between the new and old tunnels occur boulders of mixed coarsely crystalline calcite quartz and green fluorite containing some antimony, all derived from the ledge above.

Workings include 2 tunnels and 2 shafts comprised within a vertical range of 500 feet (152.4 meters). The newest tunnel being driven (circa 1915) to crosscut the ledge ia at an elevation of about 3,850 and extends N.75ºE. for 210 feet. Worked from the 1890's and produced sporadically in the early 1900's. Some 50 to 100 tons of ore were produced, averaging about 6% Pb, 2-4% Cu, and 20 Ag/t.

Mineral List

11 valid minerals.

Regional Geology

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

Ypresian - Campanian
47.8 - 83.6 Ma

ID: 2766816
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)

Comments: Laramide metaluminous; associated with porphyry Cu deposits

Lithology: Major:{granite,granodiorite,diorite}

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. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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