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Gunsight Mine, Gunsight District (Meyer District), Gunsight Hills, Pima Co., Arizona, USAi
Regional Level Types
Gunsight MineMine
Gunsight District (Meyer District)Mining District
Gunsight HillsGroup of Hills
Pima Co.County
ArizonaState
USACountry

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Key
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Latitude & Longitude (WGS84): 32° 12' 14'' North , 112° 41' 21'' West
Latitude & Longitude (decimal): 32.20389,-112.68917
GeoHash:G#: 9mxz5ww30
USGS MRDS Record:10109009
Locality type:Mine
Köppen climate type:BWh : Hot deserts climate
Nearest Settlements:
PlacePopulationDistance
Why167 (2017)8.6km
Ajo3,304 (2011)24.7km
Wahak Hotrontk114 (2011)30.5km
Adolfo López Mateos201 (2014)38.7km
Colinas de Sonoidag289 (2014)38.9km


‡Ref.: Weed, W.H. (1920) The Mines Handbook, Vol. XIV.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 122 (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.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 224, 331.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10109009, MRDS ID #M002260; and, Dep. ID #10283558, MAS ID #0040190242.

A former small underground Pb-Ag-Zn-Cu-Au-Baryte mine located in the center of sec. 16, T.14S., R.4W., 16 miles SE of Ajo. Produced 1881-1965. Owned/operated at times, or in part, by the Carthage Silver Mining Co.; Fernald & Scott; the Gunsight Mining Co.; Butler; Graham & Dickey; and the Fisher Mining Co.

Mineralization is a network of lensing, quartz-calcite-baryte veins with spotty, partly oxidized lead, zinc, and copper minerals along intersecting fissure zones in Laramide granitic rock. The ore zone strikes N25E and dips 55NW.

Workings include shaft and tunnel operations. Prospected as early as the 1870's and reportedly produced some 15,000 tons of $40/T Pb-Ag ore in 1881-1884. Sporadic production of some 120 tons of ore averaging 22% Pb, 5 oz. Ag/T and some Au since 1918, and also possibly in 1936.

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


4 valid minerals.

Detailed Mineral List:

Baryte
Formula: BaSO4
Description: In lensing quartz-calcite-barite veins.
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 122 (Table 4); Arizona Bureau of Mines file data.
Calcite
Formula: CaCO3
Description: In lensing quartz-calcite-barite veins.
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 122 (Table 4); Arizona Bureau of Mines file data.
Fluorite
Formula: CaF2
Description: Occurs as micro-crystals.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 224.
Plattnerite
Formula: PbO2
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 331.

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Plattnerite4.DB.05PbO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
AX2
Plattnerite4.4.1.6PbO2
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4

List of minerals for each chemical element

CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O BaryteBaSO4
O PlattneritePbO2
FFluorine
F FluoriteCaF2
SSulfur
S BaryteBaSO4
CaCalcium
Ca CalciteCaCO3
Ca FluoriteCaF2
BaBarium
Ba BaryteBaSO4
PbLead
Pb PlattneritePbO2

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

Quaternary - Miocene
0 - 23.03 Ma



ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 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]

Langhian - Chattian
13.82 - 28.1 Ma



ID: 2848149
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)

Comments: Original map source: Arizona Geological Survey, DI-8 Geologic Map of Arizona, Digital Spatial data for the Geologic Map of Arizona, v. 3.0, edited by S.M. Richard and S.M. Kneale, 2002, 10 p., 2 DOS HD disks. Arc/INFO export file (.e00) format, scale 1:1,000,000.

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]

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


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