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Gold Reef prospect, U.S. Army Yuma Proving Grounds, Silver Mining District, La Paz County, Arizona, USAi
Regional Level Types
Gold Reef prospectProspect
U.S. Army Yuma Proving Grounds- not defined -
Silver Mining DistrictMining District
La Paz CountyCounty
ArizonaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
33° 4' 53'' North , 114° 30' 41'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Cibola250 (2011)29.8km
Buckshot153 (2017)38.0km
Winterhaven394 (2011)39.7km
Yuma94,139 (2017)41.0km
El Prado Estates504 (2017)41.7km
Mindat Locality ID:
33801
Long-form identifier:
mindat:1:2:33801:2
GUID (UUID V4):
17a3bf01-1cd4-4600-a72b-321111aca5ed


‡Ref.: Wilson, E.D. (1941), Tungsten Deposits of Arizona. Arizona Bureau of Mines Bull. 148: 21.

Dale, V.B. (1959), Tungsten deposits of Yuma, Maricopa, Pinal and Graham Counties, Arizona, U.S. Bureau of Mines Report of Investigation 5516: 29-30.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 81.

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

Parker, F.Z. (1966) The Geology and Mineral Deposits of the Silver District Trigo Mountains, Yuma County, Arizona. Masters Thesis, San Diego State College.

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: 176 (Table 4).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 363.

Lemmon, D.M., unpublished data.

MRDS database Dep. ID file #10027191,MRDS ID #M002421; and, Dep. ID #10210205, MAS ID #0040120226.

A former surface W-Fe mine located in the NW¼ sec. 30, T4S, R22W (sec. 15 per MRDS), about 3½ miles by trail N of Knowles Camp, on a military reservation. Owned by H. Knowles & R. Young. NOTE: Alternate coordinates provided: 33.055N, 114.5733W.

Mineralization is a quartz vein deposit hosted in brownish quartz-sericite schist intruded by rhyolite and aplitic dikes. The schist strikes N.35ºE. & dips 30ºNW. The principal vein is spotty scheelite with iron oxides, quartz, and calcite in a narrow vein (0.61 meters wide) in a fault fissure zone that strikes N.55ºW. and dips 80ºS. and is traceable on surface intermittently for about 500 feet (152.4 meters). The vein is hosted in Mesozoic metamorphic quartz-sericite schist intruded by Tertiary rhyolite to aplitic dikes. Wall rocks exhibit alteration to sericite. The vein consists of irregular masses of sheared grayish-white quartz from less than 1 inch to 2 feet wide.

Workings include shallow prospect pits. There was a possible small production in 1953.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


4 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
Hematite
Formula: Fe2O3
'Limonite'
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: In metamorphic quartz-serticite schist; alteration product in vein wall rocks.
Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
Description: In metamorphic quartz-serticite schist; alteration product in vein wall rocks.
Scheelite
Formula: Ca(WO4)
Description: As scattered particles in a sheared quartz vein & also in adjacent wall rocks.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
'Limonite'-

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O HematiteFe2O3
O MuscoviteKAl2(AlSi3O10)(OH)2
O ScheeliteCa(WO4)
O Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca ScheeliteCa(WO4)
FeIron
Fe HematiteFe2O3
WTungsten
W ScheeliteCa(WO4)

Other Databases

Link to USGS MRDS:10027191

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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