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Black Rock Mine, Black Rock Wash, Silver District, Trigo Mts, La Paz Co., Arizona, USAi
Regional Level Types
Black Rock MineMine
Black Rock WashWash
Silver DistrictMining District
Trigo MtsMountain Range
La Paz Co.County
ArizonaState
USACountry

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Latitude & Longitude (WGS84): 33° 5' 18'' North , 114° 35' 32'' West
Latitude & Longitude (decimal): 33.08833,-114.59222
GeoHash:G#: 9mys0rs3x
USGS MRDS Record:10027198
Locality type:Mine
Köppen climate type:BWh : Hot deserts climate
Nearest Settlements:
PlacePopulationDistance
Cibola250 (2011)26.2km
Winterhaven394 (2011)39.0km
Buckshot153 (2017)40.0km
Palo Verde171 (2011)40.4km
Yuma94,139 (2017)40.5km


‡Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 73.

Hamilton (1884): 73.

Dana, System of Mineralogy, 6th edition (1896): 1094.

Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 67-68.

Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 18.

Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 93-94.

Parker, F.Z. (1966) The Geology and Mineral Deposits of the Silver District Trigo Mountains, Yuma County, Arizona. Masters Thesis, San Diego State College: 131-132.

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: 175 (Table 4).

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

Rocks & Minerals (1989): 64: 58.

Rocks & Minerals (1990): 65: 455.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10027198, MRDS ID #M002447; and, Dep. ID #10113536, MAS ID #0040120088.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 288.

A former surface and underground Zn-Pb-Ag-Fluorspar-Mn-Mo mine located in the SE¼ sec. 11 & the SW¼ sec. 12, T4S, R23W, about 1 mile SE of the Red Cloud Mine, 36 miles from Dome, 4 miles NW of the Colorado River, at about 750 feet of altitude, on patented (private) land. Patented during the 1880's. Owned at times, or in part, by the Black Rock Mining & Reduction Co.; Penn Metals, Inc.; Riley & Holmes; and, Mr. C.E. Batton (1933).

Mineralization is the Black Rock vein that has an immense outcrop (about 200 feet wide). The ore zone is 609.6 meters long with a depth to bottom of 82.3 meters, strikes N65W and dips 40NE. Ore is zinc carbonate and argentiferous lead carbonate, oxide and sulfate and local residual galena, in irregular, cellular masses in a gangue of manganese and iron-stained calcite, together with less amounts of silicified breccia, vuggy quartz and fine-grained fluorite, in lensing ore shoots in Cretaceous or Tertiary schist and hornfels, intruded and metamorphosed by granodiorite. The vein occurs within a fault zone that strikes N65ºW. & dips 40ºNE. and can be traced on surface for more than 600 feet. Several quartz-fluorite stringers occur near and parallel to the large vein, and are cut by branching veinlets of later calcite. For some 50 feet on each side of the main vein, the schist shows pronounced silicification, chloritization and carbonitization.

The prevailing rock on this claim is schist, which, in the southeastern portion, underlies the Tertiary volcanic series. This schist consists of fine-grained quartz and sericitized feldspar, alternating with bands of partly chloritized biotite. It weathers to blocky, moderately fissile, dark gray surfaces. On this claim its principal lamination strikes NW and dips steeply NE. Complex faulting and fracturing have affected this schist.

This is one of the earliest discoveries and patented in 1880. A shaft at 100 feet deep (1881), later deepened to 420 feet before 1884, and more than 900 feet of drifts and tunnels, adit and pit operations produced rich Pb-Ag ore from 1883 to 1887 but the amount is unknown. In 1941 additional production of 1,300 tons of ore averaging about 5.3% Pb, 1.7 oz. Ag/T and minor Cu and Au occurred. The dump was retreated in 1948-1949 together with other dumps.

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


14 valid minerals.

Detailed Mineral List:

Anglesite
Formula: PbSO4
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94.
Calcite
Formula: CaCO3
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94; Min.Rec.: 21:158.
Cerussite
Formula: PbCO3
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Min.Rec.: 21:158; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94.
'Chlorite Group'
Description: In altered wall rocks.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68.
Fluorite
Formula: CaF2
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Min.Rec.: 21:158.
Galena
Formula: PbS
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94; Galbraith, F.W. (1947), Minerals of AZ, AZ Bur. of Mines Bull. 153: 18.
Galena var: Argentiferous Galena
Formula: PbS
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94; Galbraith, F.W. (1947), Minerals of AZ, AZ Bur. of Mines Bull. 153: 18.
Goethite
Formula: α-Fe3+O(OH)
Reference: Min.Rec.: 21: 158.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94.
Massicot
Formula: PbO
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: In altered wall rocks.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Description: In altered wall rocks.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68.
Pyrolusite
Formula: Mn4+O2
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94; Min.Rec.: 21:158.
Quartz
Formula: SiO2
Colour: Brownish gray
Description: Vuggy and honeycombed.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Min.Rec. ; 21:158.
Smithsonite
Formula: ZnCO3
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 67-68; Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94.
Vanadinite
Formula: Pb5(VO4)3Cl
Reference: [MinRec 21:158]
Willemite
Formula: Zn2SiO4
Reference: Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, AZ Bur. Mines Bull. 158: 94; Rocks & Min.:64:58.
Wulfenite
Formula: Pb(MoO4)
Reference: [MinRec 21:158]

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
var: Argentiferous Galena2.CD.10PbS
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Massicot4.AC.25PbO
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Cerussite5.AB.15PbCO3
Smithsonite5.AB.05ZnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anglesite7.AD.35PbSO4
Wulfenite7.GA.05Pb(MoO4)
Group 8 - Phosphates, Arsenates and Vanadates
Vanadinite8.BN.05Pb5(VO4)3Cl
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Willemite9.AA.05Zn2SiO4
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Group 4 - SIMPLE OXIDES
AX
Massicot4.2.7.1PbO
AX2
Pyrolusite4.4.1.4Mn4+O2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Cerussite14.1.3.4PbCO3
Smithsonite14.1.1.6ZnCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite28.3.1.3PbSO4
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Vanadinite41.8.4.3Pb5(VO4)3Cl
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] coordination
Willemite51.1.1.2Zn2SiO4
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
Galena
var: Argentiferous Galena
-PbS
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H Limonite(Fe,O,OH,H2O)
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
C CerussitePbCO3
C SmithsoniteZnCO3
OOxygen
O QuartzSiO2
O Goethiteα-Fe3+O(OH)
O WulfenitePb(MoO4)
O VanadinitePb5(VO4)3Cl
O CalciteCaCO3
O PyrolusiteMn4+O2
O CerussitePbCO3
O WillemiteZn2SiO4
O MassicotPbO
O AnglesitePbSO4
O SmithsoniteZnCO3
O Limonite(Fe,O,OH,H2O)
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
FFluorine
F FluoriteCaF2
AlAluminium
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si WillemiteZn2SiO4
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S Galena (var: Argentiferous Galena)PbS
S AnglesitePbSO4
S GalenaPbS
ClChlorine
Cl VanadinitePb5(VO4)3Cl
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca FluoriteCaF2
Ca CalciteCaCO3
VVanadium
V VanadinitePb5(VO4)3Cl
MnManganese
Mn PyrolusiteMn4+O2
FeIron
Fe Goethiteα-Fe3+O(OH)
Fe Limonite(Fe,O,OH,H2O)
ZnZinc
Zn WillemiteZn2SiO4
Zn SmithsoniteZnCO3
MoMolybdenum
Mo WulfenitePb(MoO4)
PbLead
Pb WulfenitePb(MoO4)
Pb VanadinitePb5(VO4)3Cl
Pb CerussitePbCO3
Pb Galena (var: Argentiferous Galena)PbS
Pb MassicotPbO
Pb AnglesitePbSO4
Pb GalenaPbS

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]

Tithonian - Toarcian
145 - 182.7 Ma



ID: 2773446
Jurassic granitic rocks

Age: Jurassic (145 - 182.7 Ma)

Description: Granite to diorite, locally foliated and locally alkalic; includes Triassic(?) granitoids in the Trigo Mountains. This unit includes two dominant assemblages of igneous rocks. The Kitt Peak-Trigo Peaks superunit includes, from oldest to youngest: dark, foliated or gneissic diorite, medium-grained equigranular to porphyritic granodiorite, and small, irregular intrusions of light-colored, fine-grained granite. The Ko Vaya superunit, limited to south-central Arizona, includes texturally heterogeneous K-feldspar-rich granitic rocks. (150-180 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:{diorite,alkali granite,granodiorite}

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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