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Iron Cap Mine, Harshaw Mining District, Patagonia Mountains, Santa Cruz Co., Arizona, USAi
Regional Level Types
Iron Cap MineMine
Harshaw Mining DistrictMining District
Patagonia MountainsMountain Range
Santa Cruz Co.County

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Latitude & Longitude (WGS84):
31° 30' 3'' North , 110° 45' 30'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
Patagonia890 (2017)4.3km
Kino Springs136 (2011)16.1km
Beyerville177 (2011)16.7km
Rio Rico18,962 (2011)20.9km
Sonoita818 (2015)22.1km

Ref.: Schrader, F.C. (1915) Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, with contributions by J.M. Hill: U.S. Geological Survey Bulletin 582, 373 p., 3 sheets, scale 1:125,000: 261.

Kartchner, W.E. (1944) The geology and ore deposits of a portion of the Harshaw district, Patagonia Mountains, Arizona: Tucson, University of Arizona, Ph.D. dissertation, 100 p.: 82-84.

Simons, F.S. (1974) Geologic map and sections of the Nogales and Lochiel quadrangles, Santa Cruz County, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-762, 9 p., 1 sheet, scale 1:48,000.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology file data.

U.S. Bureau of Land Management Mining District Sheet #721.

MRDS database Dep. ID file #10048340, MRDS ID #M899927; and, Dep. ID #10161980, MAS ID #0040230233.

A former small surface and underground Au-Ag-Cu-Zn-Pb mine located in the SE¼ sec. 24, T22S, R15E, 1 mile NNW of the Flux Mine, on the SW side of the ridge between Alum Gulch and Flux Mine Road, 2½ miles S of Patagonia, on private land. Produced 1947-1948. Owners and operators included Mr. Lemont Conley (1947-1948). This property might have been owned and patented by the Allison Brothers in the early 1900's (see Schrader, 1915; P.261).

Mineralization is ore that mainly occurs in N-S-trending shear zone or lode. The Iron Cap deposit is located on or near the Flux lode, which has a known extent of 1.5 miles. The lode is 2,413.95 meters long and narrows with depth. Ore concentration was secondary enrichment along brecciated zones. Alteration is surface oxidation to unknown depths with pyrite gossan at surface. An associated rock unit is the Mt. Wrightson Formation.

This deposit is located on or near the northward extension of the Harshaw Creek Fault and the northward extension of the Flux Mine mineralization. The local rhyolite contains isolated exotic blocks of Upper Palezoic limestone. General structure common to regional formations is a sheeting which dips 40 NNW. Rhyolite volcanics are crushed, altered, and silicified.

Tectonic elements include the Alum Gulch Fault Block and complex fault systems associated with the Harshaw Creek Fault.

Workings include an adit.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals.

Detailed Mineral List:

'Chlorite Group'
Reference: MRDS database Dep. ID file #10048340, MRDS ID #M899927.
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: MRDS database Dep. ID file #10048340, MRDS ID #M899927.
Formula: Fe2O3
Reference: MRDS database Dep. ID file #10048340, MRDS ID #M899927.
Reference: MRDS database Dep. ID file #10048340, MRDS ID #M899927.
Formula: (Fe,O,OH,H2O)
Reference: MRDS database Dep. ID file #10048340, MRDS ID #M899927.
Formula: FeS2
Reference: MRDS database Dep. ID file #10048340, MRDS ID #M899927.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-

List of minerals for each chemical element

H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Limonite(Fe,O,OH,H2O)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O HematiteFe2O3
O Limonite(Fe,O,OH,H2O)
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
S PyriteFeS2
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HematiteFe2O3
Fe PyriteFeS2
Fe Limonite(Fe,O,OH,H2O)

Other Databases

USGS MRDS Record:10048340

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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