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Engesser Mine (Engesser prospect; Johnnie prospect), Engesser Pass, Tank Mountains Mining District, Tank Mountains, Yuma Co., Arizona, USAi
Regional Level Types
Engesser Mine (Engesser prospect; Johnnie prospect)Mine
Engesser PassPass
Tank Mountains Mining DistrictMining District
Tank MountainsMountain Range
Yuma Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
33° 13' 51'' North , 113° 51' 27'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:


A Au prospect located in the NE¼ sec. 25, T2S, R16W (protracted), on land of unknown status.

Mineralization is varied: (1) Scattered, short, lenticular, and narrow, gold-bearing quartz, carbonate, iron oxide and minor, partly oxidized, copper and iron sulfide veins in fissure zones in Mesozoic granitic intrusive and metamorphic schist, with dioritic to rhyolitic dikes. Wall rocks are sericitized, silicified, and carbonatized. Gold concentrated by weathering in near-surface iron oxides and quartz.

Country rock is granite exhibiting coarse, pinkish phenocrysts of orthoclase and dark minerals, largely chlortized. It is cut by dikes of diorite porphyry & rhyolite porphyry & adjacent to veins, is rather intensely altered to sericite and carbonite. The vein strikes N20E & dips 45W.

Workings include an old, irregular shaft about 300 feet deep along the dip of the vein and a few short, irregular drifts.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.
Chalcopyrite
Formula: CuFeS2
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 41, 124-125.
'Chlorite Group'
Description: Occurs in country rock granite.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.
Gold
Formula: Au
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.
Hematite
Formula: Fe2O3
Description: Granular.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Colour: Yellowish
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 262; Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 42, 124-125.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.
Magnetite
Formula: Fe2+Fe3+2O4
Description: Occurs as a vein mineral.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 42, 124-125.
Magnetite var: Lodestone
Formula: Fe2+Fe3+2O4
Description: Occurs as a vein mineral.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 42, 124-125.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs as an alteration product in vein wall rocks.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs as an alteration product in vein wall rocks.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.
Orthoclase
Formula: K(AlSi3O8)
Colour: Pinkish
Description: Occurs as coarse phenocrysts in granite country rock.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.
Pyrite
Formula: FeS2
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 124-125.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
var: Lodestone4.BB.05Fe2+Fe3+2O4
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Jarosite7.BC.10KFe3+3(SO4)2(OH)6
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase9.FA.30K(AlSi3O8)
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
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 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Jarosite30.2.5.1KFe3+ 3(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
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Orthoclase76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)
Magnetite
var: Lodestone
-Fe2+Fe3+2O4
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H JarositeKFe3+ 3(SO4)2(OH)6
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Limonite(Fe,O,OH,H2O)
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
OOxygen
O JarositeKFe3+ 3(SO4)2(OH)6
O Magnetite (var: Lodestone)Fe2+Fe23+O4
O OrthoclaseK(AlSi3O8)
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Limonite(Fe,O,OH,H2O)
O HematiteFe2O3
O CalciteCaCO3
O MagnetiteFe2+Fe23+O4
O MuscoviteKAl2(AlSi3O10)(OH)2
AlAluminium
Al OrthoclaseK(AlSi3O8)
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si OrthoclaseK(AlSi3O8)
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S JarositeKFe3+ 3(SO4)2(OH)6
S ChalcopyriteCuFeS2
S PyriteFeS2
KPotassium
K JarositeKFe3+ 3(SO4)2(OH)6
K OrthoclaseK(AlSi3O8)
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
FeIron
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe ChalcopyriteCuFeS2
Fe Magnetite (var: Lodestone)Fe2+Fe23+O4
Fe Limonite(Fe,O,OH,H2O)
Fe HematiteFe2O3
Fe PyriteFeS2
Fe MagnetiteFe2+Fe23+O4
CuCopper
Cu ChalcopyriteCuFeS2
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 41, 42, 124-125.
Arizona Bureau of Mines Bull. 135 (1933), Arizona Gold Placers & Placering: 23.
Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 148.
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: 179 (Table 4).
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 262.
U.S. Bureau of Mines file data.
MRDS database Dep. ID file #10162352, MAS ID #0040271055.

Other Databases

USGS MRDS Record:10162352

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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