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Bobtail Mine (Virginia Mine; Missouri Mine; Mariana Missouri Mine; Twentieth Century claims; Wisner-Glassburn property; Mariana property; Bobaway property; Doak group), Pinal Peak area, Pinal Mountains Mining District, Pinal Mountains, Gila Co., Arizona, USAi
Regional Level Types
Bobtail Mine (Virginia Mine; Missouri Mine; Mariana Missouri Mine; Twentieth Century claims; Wisner-Glassburn property; Mariana property; Bobaway property; Doak group)Mine
Pinal Peak areaArea
Pinal Mountains Mining DistrictMining District
Pinal MountainsMountain Range
Gila Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
33° 16' 22'' North , 110° 51' 47'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Six Shooter Canyon1,019 (2017)13.3km
Miami1,783 (2017)14.1km
Top-of-the-World231 (2011)14.7km
Central Heights-Midland City2,534 (2011)15.2km
Globe7,396 (2017)15.3km


A former surface and underground Ag-Cu-Au-W-Pb-Zn mine located in sec. 12, T2S, R14E, about 2 miles WSW of Pinal Peak, about 2½ miles NW of Pioneer Mountain, and 8-10 miles SW of Globe, southern part of the Pinal Mountains, on National Forest land. Discovered 1898. Closed 1950. Claims extend into sec. 7, T2S, R15E. Operators included the Pandora Copper Co. (1915); the Bobtail Development Co.; Kilpatrick Brothers; the Tulsa Minerals Corp. (1945-1947); Rodengarten (1926); C. H. Foerester and J. Belcher (1940).

Mineralization is a pinch and swell ore body, 0.3 meters wide, hosted in the Algonkian Pinal Schist. It is a strong vein of sulfide ore, including native copper. The ore zone strikes N30E to N55E and dips N37W to N62W. An associated rock units are the Schultze Granite, diorite and diabase. Ore concentration was the result of intrusions of granite, diorite and diabase into the schist that have caused variations in the strike and dip of the planes of schistosity. The Bobtail vein carries little or no tungsten value. The tungsten vein contains sparse tungsten minerals.

No detailed geologic map of the area is available. NE-trending Early Tertiary Schultze Granite dikes are common throughout the district, as are outcrops of Madera Diorite (Precambrian). Mineralization is associated with an Early Tertiary Schultze Granite intrusion.

Workings include several shallow pits and open cuts. Two short adits are also located on the property, includes an inclined shaft, 75 feet deep, and an adit, 235 feet long. Workings total 304.8 meters in length and 66.45 meters in depth. No tungsten production was recorded.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 valid minerals.

Detailed Mineral List:

Chalcopyrite
Formula: CuFeS2
Reference: A.I.M.E. Ore Deposits of the Western States (1933): 605.
Copper
Formula: Cu
Reference: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 65.
Galena
Formula: PbS
Reference: A.I.M.E. Ore Deposits of the Western States (1933): 605.
Gold
Formula: Au
Reference: MRDS database Dep. ID #10102398, MRDS ID #M000370.
Hübnerite
Formula: MnWO4
Reference: A.I.M.E. Ore Deposits of the Western States (1933): 605.
Pyrite
Formula: FeS2
Reference: MRDS database Dep. ID #10102398, MRDS ID #M000370.
Scheelite
Formula: Ca(WO4)
Reference: MRDS database Dep. ID #10102398, MRDS ID #M000370.
Silver
Formula: Ag
Reference: MRDS database Dep. ID #10102398, MRDS ID #M000370.
Sphalerite
Formula: ZnS
Reference: Univ. of AZ Bull. 41 (1916-17), Mineralogy iof Useful Minerals in AZ: 56; A.I.M.E. Ore Deposits of the Western States (1933): 605.
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 423.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Hübnerite4.DB.30MnWO4
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Unclassified Minerals, Rocks, etc.
'Wolframite'-(Fe2+)WO4to (Mn2+)WO4

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Gold1.1.1.1Au
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
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
Hübnerite48.1.1.1MnWO4
Scheelite48.1.2.1Ca(WO4)
Unclassified Minerals, Mixtures, etc.
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals for each chemical element

OOxygen
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
O HübneriteMnWO4
O ScheeliteCa(WO4)
SSulfur
S SphaleriteZnS
S ChalcopyriteCuFeS2
S GalenaPbS
S PyriteFeS2
CaCalcium
Ca ScheeliteCa(WO4)
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
Mn HübneriteMnWO4
FeIron
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
CuCopper
Cu ChalcopyriteCuFeS2
Cu CopperCu
ZnZinc
Zn SphaleriteZnS
AgSilver
Ag SilverAg
WTungsten
W Wolframite(Fe2+)WO4 to (Mn2+)WO4
W HübneriteMnWO4
W ScheeliteCa(WO4)
AuGold
Au GoldAu
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 65.
Ransome, F.L. (1903) Geology of the Globe Copper District, Arizona, USGS PP 12: 161.
University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 56.
A.I.M.E. Ore Deposits of the Western States (1933): 605.
Wilson, E.D. (1941), Arizona Bureau of Mines Bull. 148: 29.
Dale, V.B. (1961), Tungsten Deposits of Gila, Yavapai, and Mohave Counties, Arizona, US Bureau of Mines Information Circular 8078: 3-7.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 423.
USGS Pinal Peak Quadrangle map.
Arizona Department of Mineral Resources Bobtail group file.
Arizona Department of Mineral Resources U file, Cu18 and W10.
Arizona Department of Mineral Resources Twentieth Century Mine file.
MRDS database Dep. ID #10102398, MRDS ID #M000370; and Dep. ID #10258459, MAS ID #0040070197.

Other Databases

USGS MRDS Record:10102398

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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