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Fortuna Mining District (La Fortuna Mining District), Yuma County, Arizona, USAi
Regional Level Types
Fortuna Mining District (La Fortuna Mining District)Mining District
Yuma CountyCounty
ArizonaState
USACountry

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Latitude & Longitude (WGS84):
32° North , 113° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~98km
GRN:
N22W69
Locality type:
Mining District
Köppen climate type:
BWh : Hot deserts climate


A Au-Ag-Cu-Fe-Mn-W-mica (Be-Ta-Nb-Th-RRE) mining area located in T.9-11S., R.19-20W., in the central and southern Gila Mountains.

Mineralization is varied: (1) Free gold, of ten with minor copper mineralization and pyrite, with a gangue of quartz, calcite, iron oxides, and manganese oxides , in irregular, lensing veins in fault and fracture zones in Mesozoic schist. There are some traces of tungsten; (2) Muscovite mica and samarskite in irregular pegmatites in small intrusives of Laramide granite; and, (3) Placer gold, mainly from old tailings.

Workings include one major mine shaft and several small prospects worked sporadically from the early 1890's to about 1951. Estimated and recorded production would be some 213,500 tons of ore, almost all from the Fortuna Mine, containing about 134,429 oz. of gold, 10,650 oz. silver and 98 pounds of copper.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

16 valid minerals.

Detailed Mineral List:

ⓘ Andalusite
Formula: Al2(SiO4)O
Habit: Prismatic, long, tabular, radiating
Description: Occurs as crystals in gray, speckled, quartz-biotite schist adjacent to the vein.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 43, 189-199.
ⓘ Azurite
Formula: Cu3(CO3)2(OH)2
Description: Small irregular masses in vein quartz.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 127; Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 40, 201.
ⓘ Beryl
Formula: Be3Al2(Si6O18)
Colour: Lavender, rose
Description: Crystals occur in matrix of yellowish quartz.
Reference: Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 93.
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Description: In vein quartz.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 40, 201.
ⓘ Calcite
Formula: CaCO3
Reference: 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: 150 (Table 4).
ⓘ Chalcocite
Formula: Cu2S
Description: Small, irregular masses in vein quartz.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 40, 201.
ⓘ Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Description: Occurs in black schist.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 43, 189.
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 201-202.
ⓘ Gold
Formula: Au
Reference: 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: 150 (Table 4).
ⓘ Gypsum
Formula: CaSO4 · 2H2O
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 201-202.
ⓘ Hematite
Formula: Fe2O3
Description: Crystals in feldspar of narrow pegmatite dikes; fracture linings in quartz.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 40, 201.
ⓘ Hematite var. Specularite
Formula: Fe2O3
Description: Occurs as small, shiny masses in schist near its hanging wall.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 43, 189.
ⓘ 'Hornblende'
Description: Occurs in vein wall rocks.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 43, 189.
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
Description: In decomposed pegmatite dike.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 201-202.
ⓘ 'Limonite'
Reference: 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: 150 (Table 4); Blake (1897); Blake (1898); Wilson, E.D. (1933): 189-199; Wilson, E.D. (1934)(revised 1967): 152-155; Arizona Bureau of Mines file data.
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
Description: Occurs in pegmatite dikes cutting gneiss.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 199-200.
ⓘ Magnetite var. Lodestone
Formula: Fe2+Fe3+2O4
Description: Occurs in pegmatite dikes cutting gneiss.
Reference: Wilson, E.D. (1933), AZ Bur. Mines Bull. 134: 199-200.
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
Description: Small, irregular masses in vein quartz.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 40, 201.
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: 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: 150 (Table 4).
ⓘ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
Description: Coarse-grained, in altered schist nr pegmatite dike.
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 201-202.
ⓘ Pyrite
Formula: FeS2
Reference: 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: 150 (Table 4).
ⓘ Quartz
Formula: SiO2
Reference: Wilson, E.D. (1933), AZ Bur. of Mines Bull. 134: 40, 201.
ⓘ Samarskite-(Y)
Formula: YFe3+Nb2O8
Reference: 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: 150 (Table 4).

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘHematite4.CB.05Fe2O3
ⓘvar. Specularite4.CB.05Fe2O3
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘvar. Lodestone4.BB.05Fe2+Fe3+2O4
ⓘQuartz4.DA.05SiO2
ⓘSamarskite-(Y)4.DB.25YFe3+Nb2O8
Group 5 - Nitrates and Carbonates
ⓘAzurite5.BA.05Cu3(CO3)2(OH)2
ⓘCalcite5.AB.05CaCO3
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘGypsum7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
ⓘAndalusite9.AF.10Al2(SiO4)O
ⓘBeryl9.CJ.05Be3Al2(Si6O18)
ⓘEpidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘvar. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Hornblende'-
ⓘ'Limonite'-

List of minerals for each chemical element

HHydrogen
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ AzuriteCu3(CO3)2(OH)2
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Hⓘ Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
BeBeryllium
Beⓘ BerylBe3Al2(Si6O18)
CCarbon
Cⓘ CalciteCaCO3
Cⓘ AzuriteCu3(CO3)2(OH)2
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ CalciteCaCO3
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ Samarskite-(Y)YFe3+Nb2O8
Oⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ Garnet GroupX3Z2(SiO4)3
Oⓘ AzuriteCu3(CO3)2(OH)2
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ HematiteFe2O3
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Oⓘ QuartzSiO2
Oⓘ AndalusiteAl2(SiO4)O
Oⓘ BerylBe3Al2(Si6O18)
Oⓘ Magnetite var. LodestoneFe2+Fe23+O4
Oⓘ Hematite var. SpeculariteFe2O3
Oⓘ Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Oⓘ MagnetiteFe2+Fe23+O4
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
AlAluminium
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Alⓘ AndalusiteAl2(SiO4)O
Alⓘ BerylBe3Al2(Si6O18)
Alⓘ Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ Garnet GroupX3Z2(SiO4)3
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Siⓘ QuartzSiO2
Siⓘ AndalusiteAl2(SiO4)O
Siⓘ BerylBe3Al2(Si6O18)
Siⓘ Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SSulfur
Sⓘ PyriteFeS2
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ ChalcociteCu2S
KPotassium
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
FeIron
Feⓘ PyriteFeS2
Feⓘ Samarskite-(Y)YFe3+Nb2O8
Feⓘ HematiteFe2O3
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Feⓘ Magnetite var. LodestoneFe2+Fe23+O4
Feⓘ Hematite var. SpeculariteFe2O3
Feⓘ Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Feⓘ MagnetiteFe2+Fe23+O4
CuCopper
Cuⓘ AzuriteCu3(CO3)2(OH)2
Cuⓘ MalachiteCu2(CO3)(OH)2
Cuⓘ ChalcociteCu2S
YYttrium
Yⓘ Samarskite-(Y)YFe3+Nb2O8
NbNiobium
Nbⓘ Samarskite-(Y)YFe3+Nb2O8
AuGold
Auⓘ GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Blake, William P. (1897), The Fortuna gold mine, Engineering and Mining Journal: 63: 26.
Blake, W.P. (1898) Distribution of metallic wealth in Arizona, in Report of the Governor of Arizona to the Secretary of the Interior for fiscal year ending June 30, 1898: Washington, D.C.: 19-86.
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 181-202.
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: 151-156.
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: 150 (Table 4).
Arizona Bureau of Mines file data.

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