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Abril Mine (Dos Hermanos Mine; Herrera Mine), Cochise Stronghold, Middle Pass District, Dragoon Mts, Cochise Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 54' 29'' North , 109° 59' 27'' West
Latitude & Longitude (decimal): 31.90806,-109.99083
GeoHash:G#: 9t9v90ejg
Other regions containing this locality:Sonoran Desert, North America
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate

A former small underground Zn-Cu-Pb-Mo-Ag-Au-Wollastonite-Asbestos-Bi-Be-Li-Cd-Ga-Co-W) mine located in the South-central sec. 34, T.17S., R.23E., 5 km almost due north of Mt Glenn in the Dragoon Mts., 2 air miles north of the San Juan Mine or 21 miles from Tombstone, on the western slope of the Dragoon Mountains, at an altitude of approximately 6,600 feet. 10 unpatented claims in 1952. Discovered and first produced 1903. Closed 1953. Owned at times, or in part, by the Abril Brothers and H.W. Smith of Tombstone (1943); Bargin Mines, Inc. (part of 1945) and the Shattuck Denn Mining Co. (Dec 1945- ).

Mineralization is base metal sulfides and rare minerals in irregular pyrometasomatic deposits skarn minerals (lime silicates) in a tactite zone in Pennsylvanian-Permian Naco Group limestone cut by granitic intrusive and rhyolite porphyry dikes. Orebodies are irregular replacements in impure beds within the lower 70 feet of the limestone. They are localized beneath the zone of bedding-plane faults, and occur associated with northeast fissures. Host rock unit is the Naco Group Limestone. An associated rock unit is the Stronghold Granite.
The top of the ridge east of Abril Camp consists of fine-grained, light-colored quartzite approximately 80 feet thick. It is overlain, on the eastern backslope, by a thick series of metamorphosed, locally foliated shale and arkosic sandstone.

Underlying the quartzite is limestone, approximately 570 feet thick. Its upper portion consists of massive, locally cherty beds which are largely metamorphosed to marble. Its lower portion, 70 feet thick, is made up of impure, shaly limestone, locally converted to contact-silicate minerals (tactite).

Underlying the limestone is arkosic quartzite with a maximum observed thickness of 100 feet. It is underlain, with intrusive contact, by granite. Fine-grained, light-colored arkosic quartzite, commonly 25 to 100 feet thick, underlies the limestone and rests upon the instrusive Stronghold granite. The two quartzite members and the limestone between them are regarded as Permian.

The sedimentary beds at this mine dip northeastward at angles of 25º to 50º. Exploration has shown that the Stronghold granite intrudes the lower quartzite subparallel to its bedding. A northeastward-trending dike of the granite 175 to 300 feet wide cuts the sedimentary beds immediately north of adit 5. Near this dike the beds have been complexly faulted and sharply folded. A fault sipping 50º to 60º northeastward strikes N.30º to 45º W., through the portal of adit 3, bringing quartzite on the SW against limestone on the NE.

Workings include 5 adits, tunnels on 5 levels, numerous stopes and winzes. Tunnels open at elevations ranging from 5320 feet to 6441 feet.
Nearly 30,000 tons of zinc-copper ore were produced intermittently since 1914 but mainly during 1945-1952. 1947 production was some 9,900 tons of ore milles that yielded, in addition to the zinc, 188,162 pounds of Cu, 12,725 pounds of lead, 3,508 oz. Ag and 26 oz. Au.

A government exploration loan for drifting, raising and drilling was granted in the early 1950's.

Mineral List

14 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 Macrostrat.org

Langhian - Chattian
13.82 - 28.1 Ma

ID: 2848145
Middle Miocene to Oligocene granitic rocks

Age: Cenozoic (13.82 - 28.1 Ma)

Description: Granite to diorite representing solidified magma chambers that were the likely source of overlying and nearby volcanic rocks of map unit Tv. The granitic rocks are typically equigranular and fine- to medium-grained. (14-26 Ma)

Lithology: Major:{granite,granodiorite,diorite}, Minor:{quartz 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]

66 - 145 Ma

ID: 3187054
Mesozoic sedimentary rocks

Age: Cretaceous (66 - 145 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. [154]

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

This page 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.


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‡Ref.: Lerchen, F.H. (1937) Memo to Eagle-Picher (unpublished)(available at the ADMMR).
Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 23-26.
US Atomic Energy Commission Preliminary Report D-502 (1952).
Raup, R.B. (1953) [Abril mine, Dragoon district]: U.S. Geological Survey Trace Elements Preliminary Reconnaissance Report D-502, 1 p. [also available in U.S. Atomic Energy Commission Report RME-154, p. 50].
Farnham, L.L. (1954) U.S. Bureau of Mines Report for DMEA-399X on Abril Zinc Mine (contract IDM-E210)(unpublished).
Owens, S.B. (1954 ?) The Abril Mine Final Report, Contract IDM-E210.
Warner, L.A., et al (1959), Occurrence of non-pegmatite beryllium in the US, USGS PP 318: 95, 97.
Cooper, J.R. (1962) Bismuth in the United States, exclusive of Alaska and Hawaii: U.S. Geological Survey Mineral Investigations Resource Map MR-22, 19 p., 1 sheet, scale 1:3,168,000: 4.
Perry, D.V. (1964) Genesis of the contact rocks at the Abril mine, Cochise County, Arizona: Tucson, University of Arizona, M.S. thesis, 97 p.
Meeves, H.C. (1966), Nonpegmatite beryllium occurrences in AZ, CO, NM, UT and four adjacent states, U.S. Bureau of Mines Report of Investigation 6828.
Shawe, D.R. (1966), Arizona-New Mexico and Nevada-Utah beryllium belts, USGS PP 550-C: 206-213.
Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 187, Index of Mining Properties in Cochise County, Arizona: 68 (Table 4).
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.
Woodcock, J.R. (1990) unpublished letter (available at ADMMR files).
Chatman, M.L. (1993) U.S. Bureau of Mines Open File Report Mineral Land Assessment (MLA) 30-93: 29-31, D39-D46.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 133, 148, 204, 211, 245, 377, 424.
Arizona Department of Mineral Resources file data.
MRDS database Dep. ID file #10026967, MRDS ID #M001415; and, Dep. ID #10305551, MAS ID #040030087.

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