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Senator Morgan Mine group, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima Co., Arizona, USAi
Regional Level Types
Senator Morgan Mine group- not defined -
Twin Buttes- not defined -
Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District)Mining District
Sierrita MountainsMountain Range
Pima Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
31° 53' 10'' North , 111° 4' 38'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Green Valley21,391 (2011)8.6km
Sahuarita25,707 (2017)14.0km
East Sahuarita1,622 (2006)15.4km
Arivaca Junction1,090 (2011)17.7km
Amado295 (2011)19.8km


‡Ref.: Ransome, F.L. (1922) Ore deposits of the Sierrita Mountains, Pima County, Arizona, in Contributions to Economic Geology (Short Papers and Preliminary Reports), 1921 - Part I.--Metals and Nonmetals except Fuels: U.S. Geological Survey Bulletin 725J: 425-427.

Brown, R.L. (1926) Geology and ore deposits of the Twin Buttes district: Tucson, University of Arizona, M.S. thesis, 40 p.

Wilson, E.D. (1941), Tungsten Deposits of Arizona, Geological Series No. 14, Arizona Bureau of Mines Bull. 148: 37, 44-46.

Mayuga, M.N. (1942) The Geology and Ore Deposits of the Helmet Peak Area, Pima County, Arizona, PhD thesis, University of Arizona.

Dale, V.B., et al (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties, Arizona, U.S. Bureau of Mines Report of Investigation 5650: 85-92.

Lemmon, D.M., and Tweto, O.L. (1962) Tungsten in the U.S., USGS map, MR-25.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 138 (Table 4).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 334.

USGS Twin Buttes Quadrangle topo map.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039591, MRDS ID #M050383; and, Dep. ID #10113317, MAS ID #0040190392.

A former small surface and underground Cu-Ag-Zn-Pb-W-Au-Mo mine located in the SW ¼ sec. 1 & the SE ¼ sec. 2, T.18S., R.12E., about 9 miles west of Sahuarita and 1½ miles SW of Twin Buttes. Discovered 1875 or 1876. Produced 1903-1918. Owned at times, or in part, by Mr. Baxter of Twin Buttes; operated by J.A. Poindexter; the Twin Buttes Mining & Smelting Co.; Taylor; and, the American Smelting and Refining Co. (ASARCO).

Mineralization is ore in short lenses as fine-grained, pyritic, chalcopyrite mineralization, with very little oxidation, in garnetized, pyrometasomatic zones, with spotty and local scheelite and powellite in quartz veins, localized by faulting, fracturing and favorable beds in Paleozoic limestone along a NW fault contact with Cretaceous sediments. Favo Rable Limestone beds. Closely associated Laramide granodiorite porphyry dike. Shearing parallel to, and in, veins. The ore body is 365.76 meters long, 3.05 meters wide, with a depth to bottom of 274.32 meters.

Copper mineralization occurs along the fracture zone and extends down to 900 feet, where minable grade ore runs out or granite is encountered. Tungsten ore occurs in WNW-striking quartz fissure veins that extend up to 50 feet long and 10 feet wide. These veins occur in Cretaceous (?) quartzite and shales for 600 feet.

Local structures include NW faulting with some NE faulting.

2 oz/t Ag reported. Ore contained 0.805% WO3. Processintg produced floatation concentrates assaying 62.08% WO3 with a recovery of 92.5%.

Local rocks are SW-ward dipping quartzite and shale, more or less epidotized, and in places, stained brown with iron oxide. Outcrops are a few tens of feet to more than 50 feet long and 1 to perhaps 9 feet wide.

Workings include several shafts with a mine depth of 900 feet (274.32 meters). Worked from the deep shaft in the 1890's to 1918 for copper with estimated and reported production of some 100,000 tons of 4% Cu, 9 oz. Ag/T and minor Zn and Au. Scheelite was mined from a 40-foot deep shaft, 175 feet SW of the Morgan shaft. About 120 tons of 1.25% WO3 ore were shipped in 1942-1943. Several trenches and prospect pits for turngsten. No work on W or Cu since 1943.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 valid minerals.

Detailed Mineral List:

Chalcopyrite
Formula: CuFeS2
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 138 (Table 4); Ransome (1922): 425-427; Wilson, E.D. (1941): 44-46; Dale, et al (1960): 85-92; Arizona Bureau of Mines file data.
'Chlorite Group'
Reference: MRDS database Dep. ID file #10039591, MRDS ID #M050383.
Diopside
Formula: CaMgSi2O6
Reference: MRDS database Dep. ID file #10039591, MRDS ID #M050383.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Wilson, E.D. (1941), AZ Bur. Mines Bull. 148: 37, 44-46.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 138 (Table 4); Ransome (1922): 425-427; Wilson, E.D. (1941): 44-46; Dale, et al (1960): 85-92; Arizona Bureau of Mines file data.
Hedenbergite
Formula: CaFe2+Si2O6
Reference: MRDS database Dep. ID file #10039591, MRDS ID #M050383.
Powellite
Formula: Ca(MoO4)
Description: In quartz 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: 138 (Table 4); Ransome (1922): 425-427; Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 334; Wilson, E.D. (1941), AZ Bur. Mines Bull. 148: 37, 44-46; Dale, V.B., et al (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Cos., AZ, US Bur. Mines Rept. Inv. 5650: 85-92; Arizona Bureau of Mines file data.
Pyrite
Formula: FeS2
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 138 (Table 4); Ransome (1922): 425-427; Wilson, E.D. (1941): 44-46; Dale, et al (1960): 85-92; Arizona Bureau of Mines file data.
Scheelite
Formula: Ca(WO4)
Description: Occurs in quartz 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: 138 (Table 4); Ransome (1922): 425-427; Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 334; Ransome (1922): 425-427; Wilson, E.D. (1941), AZ Bur. Mines Bull. 148: 37, 44-46; Dale, V.B., et al (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Cos., AZ, US Bur. Mines Rept. Inv. 5650: 85-92; Arizona Bureau of Mines file data.
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: MRDS database Dep. ID file #10039591, MRDS ID #M050383.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Powellite7.GA.05Ca(MoO4)
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Diopside9.DA.15CaMgSi2O6
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Hedenbergite9.DA.15CaFe2+Si2O6
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Powellite48.1.2.2Ca(MoO4)
Scheelite48.1.2.1Ca(WO4)
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)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Hedenbergite65.1.3a.2CaFe2+Si2O6
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
OOxygen
O Garnet GroupX3Z2(SiO4)3
O ScheeliteCa(WO4)
O PowelliteCa(MoO4)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O DiopsideCaMgSi2O6
O HedenbergiteCaFe2+Si2O6
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
MgMagnesium
Mg DiopsideCaMgSi2O6
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
AlAluminium
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si Garnet GroupX3Z2(SiO4)3
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si DiopsideCaMgSi2O6
Si HedenbergiteCaFe2+Si2O6
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
CaCalcium
Ca ScheeliteCa(WO4)
Ca PowelliteCa(MoO4)
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca DiopsideCaMgSi2O6
Ca HedenbergiteCaFe2+Si2O6
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HedenbergiteCaFe2+Si2O6
CuCopper
Cu ChalcopyriteCuFeS2
MoMolybdenum
Mo PowelliteCa(MoO4)
WTungsten
W ScheeliteCa(WO4)

Other Databases

USGS MRDS Record:10039591

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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