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Natroalunite deposit (Sugar Loaf prospect; Sugarloaf Butte Alunite deposit), Sugarloaf Peak, Middle Camp-Oro Fino Mining District, Dome Rock Mountains, La Paz Co., Arizona, USAi
Regional Level Types
Natroalunite deposit (Sugar Loaf prospect; Sugarloaf Butte Alunite deposit)Deposit
Sugarloaf PeakPeak
Middle Camp-Oro Fino Mining DistrictMining District
Dome Rock MountainsMountain Range
La Paz Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
33° 38' 3'' North , 114° 18' 55'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Quartzsite3,626 (2017)8.6km
La Paz Valley699 (2011)9.3km
Ehrenberg1,470 (2011)19.7km
Blythe19,208 (2017)26.1km
Ripley692 (2011)33.8km


Ref.: Jones, Jr., E.L. (1915), Gold Deposits near Quartzsite, Arizona, in Contributions to Economic Geology by F.L. Ransome & H.S. Gale, USGS Bull. 620-C: Plate IV, 45-57.

Ross, Clyde P. (1922) USGS Professional Paper 129: 183-197.

Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 167.

Heineman (1935) Sugarloaf Butte Alunite. Engineering and Mining Journal: 136: 138-139.

Thoenen (1941) Alunite Resources of the United States. US Bureau of Mines Report of Investigation 3561: 10-11.

Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 161 (Table 4).

Crowl (1979) MS Thesis, University of Arizona.

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.

Hall, Robert B., unpublished data, Arizona Bureau of Mines files (1990).

U.S. Bureau of Mines file data.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10009277, MRDS ID #D002156; and, Dep. ID #10113322, MAS ID #0040120459; and, Dep. ID #10137700, MAS ID #0040120008.

A former surface and underground Natroalunite (Al)-Pb-Mo-Bi-W-Sn mine located in the NW¼ sec. 3, T3N, R20W (protracted), 5 miles WSW of Quartzsite, on federal land. Discovered in 1929. Owned and operated by the Ropp Brothers (?).

Mineralization is natroalunite in schistose and porphyritic dacite intruding Mesozoic schist. Host unit is the Dome Rock formation. Alteration is quartz-sericite-pyrite and silicification of schist. X-ray & chemical data indicate vein alunite is sodic. The ore zone is 1219.2 meters long, 304.8 meters wide, and 60.96 meters thick. Quartzite overlies sericite schist which overlies dacite. There are Pb, Mo, Bi, W, & Sn geochemical anomalies. Branching irregular veins. Alunite veins a few inches to 1 foot wide cut dacite and altered schist. Some are nearly pure alunite, but many are contaminated with quartz and a few contain gypsum. The purer alunite is white, massive, fine-grained and porcelain-like. The deposit is high in Na - natroalunite. Deposit dimensions are for the mineralized area.

Several anomalies have been drilled in the recent past. The known deposit is too small to serve as raw material for the aluminium industry. The value of the deposit for other uses is decreased by low grade and high Na content.

Reserves in veins only; host rock is only slightly alunized. No resources other than the vein are apparent. Only considered total rock within 20 feetfrom surface. There is probably additional alunite at greater depths but no estimate has been made. Estimate does not distinguish alunite from natroalunite but analysis indicates natroalunite.

Workings are comprised of prospect pits & a 200 foot tunnel.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Alunite
Formula: KAl3(SO4)2(OH)6
Reference: MRDS database Dep. ID file #10009277, MRDS ID #D002156.
Hematite
Formula: Fe2O3
Reference: MRDS database Dep. ID file #10009277, MRDS ID #D002156.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: MRDS database Dep. ID file #10009277, MRDS ID #D002156.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: MRDS database Dep. ID file #10009277, MRDS ID #D002156.
Natroalunite
Formula: NaAl3(SO4)2(OH)6
Description: Occurs in schistose & porphyritic dacite intruding Mesozoic schist.
Reference: Ref.: Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geol. Sur. Br. Bull. 192, Index of Mining Properties in Yuma Co., Arizona: 161 (Table 4); Arizona Bureau of Mines file data.
Pyrite
Formula: FeS2
Reference: MRDS database Dep. ID file #10009277, MRDS ID #D002156.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Alunite7.BC.10KAl3(SO4)2(OH)6
Natroalunite7.BC.10NaAl3(SO4)2(OH)6
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Alunite30.2.4.1KAl3(SO4)2(OH)6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Mixtures, etc.
var: Sericite-KAl2(AlSi3O10)(OH)2
Natroalunite-NaAl3(SO4)2(OH)6

List of minerals for each chemical element

HHydrogen
H NatroaluniteNaAl3(SO4)2(OH)6
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H AluniteKAl3(SO4)2(OH)6
H MuscoviteKAl2(AlSi3O10)(OH)2
OOxygen
O NatroaluniteNaAl3(SO4)2(OH)6
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O AluniteKAl3(SO4)2(OH)6
O HematiteFe2O3
O MuscoviteKAl2(AlSi3O10)(OH)2
NaSodium
Na NatroaluniteNaAl3(SO4)2(OH)6
AlAluminium
Al NatroaluniteNaAl3(SO4)2(OH)6
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al AluniteKAl3(SO4)2(OH)6
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S NatroaluniteNaAl3(SO4)2(OH)6
S AluniteKAl3(SO4)2(OH)6
S PyriteFeS2
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K AluniteKAl3(SO4)2(OH)6
K MuscoviteKAl2(AlSi3O10)(OH)2
FeIron
Fe HematiteFe2O3
Fe PyriteFeS2

Other Databases

USGS MRDS Record:10009277

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