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Humboldt Mine, Alum Gulch, Harshaw District, Patagonia Mts, Santa Cruz Co., Arizona, USAi
Regional Level Types
Humboldt MineMine
Alum GulchGulch
Harshaw DistrictMining District
Patagonia MtsMountain Range
Santa Cruz Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
31° 28' 10'' North , 110° 43' 58'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Patagonia890 (2017)8.1km
Kino Springs136 (2011)13.9km
Beyerville177 (2011)16.4km
Francisco Miguel Cárdenas Valdez (Mascareñas)541 (2014)22.4km
Rio Rico18,962 (2011)23.1km


‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 251-252.

Kartchner, W.E. (1944) The geology and ore deposits of a portion of the Harshaw district, Patagonia Mountains, Arizona: Tucson, University of Arizona, Ph.D. dissertation, 100 p.: 92-94.

Moores, R.C., III (1972) The geology and ore deposits of a portion of the Harshaw district, Santa Cruz County, Arizona: Tucson, University of Arizona, M.S. thesis, 98 p.

Simons, F.S. (1972) Mesozoic stratigraphy of the Patagonia Mountains and adjoining areas, Santa Cruz County, Arizona, in Mesozoic stratigraphy in southeastern Arizona: U.S. Geological Survey Professional Paper 658-E, p. E21-E22.

Simons, F.S. (1974) Geologic map and sections of the Nogales and Lochiel quadrangles, Santa Cruz County, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-762, 9 p., 1 sheet, scale 1:48,000.

Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 168

U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology file data.

Arizona Bureau of Mines file data.

U.S. Bureau of Mines Coronado National Forest Study.

MRDS database Dep. ID #10048342, MRDS ID #M899929; and, Dep. ID #10161920, MAS ID #0040230445.

A former underground Pb-Ag-Zn-Cu-Au-Mn mine located in North-central sec. 5, T.23S. R.16E. (protracted), near the head of Alum Gulch, about 1 mile south of the World's Fair Mine and 1½ miles west of Harshaw, at an elevation of 3,950 feet (shaft collar), on National Forest land. Discovered in 1885 by William Harrington and James Gillespie. Worked mostly in 1887 to 1889. Closed 1952. Owned/operated at times, or in part, by Harrington & Gillespie; Phelps Dodge Corp. (1912-?); Humboldt Mining & Reduction Co.; Mr. Carl Scheley (Scheler ?); Mr. Patrick Roscoe; Mr. G.F. Gerrard (1948); Gib And Reuben Mock (?); and, Mr. C.W. Chapman (1949). These properties consist of the Humboldt, Good Luck, Silver Leaf, and Indian Chief claims.

Mineralization is narrow, lensing quartz veins containing argentiferous cerussite in the oxidized zone and spotty argentiferous galena and other sulfides with rhodochrosite with depth, along a fault fissure zone cutting Laramide rhyolite and agglomerate and parallel to the contact between them. The ore zone is 2.74 meters wide. Deposits occur mainly in the rhyolite, 15 to 30 feet from the contact. Strong pyritization of the host rock and extensive surface oxidation. Some disseminated chalcopyrite. Ore concentration was secondary enrichment along the fault zone. Ores are either disseminated through quartz gangue or concentrated in joint or shear planes. Shear zones with galena are in the vein walls. An associated rock unit is the Josephine Canyon Diorite.

Country rock is diorite with rhyolite intrusions, with a contact that dips 85ºS.

About ¼ mile SW of the shaft, on the east side of the gulch, at an elevation of 5,000 feet, is a tunnel in rhyolite about 30 feet south of the rhyolite-diorite contact, which here strikes N.45ºE. The tunnel is on a slip in the rhyolite that is parallel the contact and dips 83ºNW. At 40 feet from the portal is a fault striking N.50ºE. and dipping 87ºSE. The rock north of this fault is dark and very much altered and seems to be in diorite. It contains disseminated pyrite. Along this fault there is 2 feet of crushed material, of which 2 to 3 inches (5 to 7.5 cm) on the hanging wall side is very siliceous and shows galena and a little tetrahedrite.

Below this tunnel, at an elevation of 4,910 feet, is a lower tunnel which starts in altered sheared rhyolite and runs N.55ºE. At 20 feet from the portal a 13 foot crosscut to the south exposes a very siliceous zone 9 feet wide which dips 70ºNE. This zone shows disseminated pyrite and chalcopyrite, and in the crosscut the walls are coated with copper and iron sulphates.

On the west side of the gulch 200 feet SW of the lower tunnel and feet above it is the portal of a new tunnel, which runs N.75ºW. for about 55 feet in altered, silicified rhyolite. It seems to be on a shear zone that dips 80ºN. Ore here shows pyrite, chalcopyrite, and galena disseminated through the siliceous material and concentrated in joint or shear planes.

Local structures include thick-bedded coarse tuffs and massive tuff breccias associated with the Trench Camp. Tectonic elements include the American Mine Fault Block.

Workings are shaft and tunnel operations aggregating some 700 feet (213.36 meters) of work, including a 160 foot deep shaft inclined 80ºS and 2 tunnels about ¼ mile SW of the shaft. A 55 foot long tunnel is about 200 feet to the SW of the other tunnels. The tunnel workings are on a slip in rhyolite that runs parallel to a rhyolite-diorite contact and dips 83NW. There are also several stopes. Worked intermittently from the late 1880's to 1952. Produced some 1,200 tons of ore averaging about 7% Pb, 19 oz. Ag/T, 1.5% Zn, 1% Cu and minor Au.

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


12 valid minerals.

Detailed Mineral List:

Alunite
Formula: KAl3(SO4)2(OH)6
Reference: MRDS database Dep. ID #10048342, MRDS ID #M899929.
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: MRDS database Dep. ID #10048342, MRDS ID #M899929.
Bornite
Formula: Cu5FeS4
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Arizona Bureau of Mines file data.
Cerussite
Formula: PbCO3
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Arizona Bureau of Mines file data.
Cerussite var: Argentiferous Cerussite
Formula: PbCO3
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Arizona Bureau of Mines file data.
Chalcopyrite
Formula: CuFeS2
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 252; Arizona Bureau of Mines file data.
Chenevixite
Formula: Cu2Fe3+2(AsO4)2(OH)4
Habit: Micro-crystals
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 168.
Galena
Formula: PbS
Description: Fine-grained.
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 251; Arizona Bureau of Mines file data.
Galena var: Argentiferous Galena
Formula: PbS
Description: Fine-grained.
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 251; Arizona Bureau of Mines file data.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: MRDS database Dep. ID #10048342, MRDS ID #M899929.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: MRDS database Dep. ID #10048342, MRDS ID #M899929.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: MRDS database Dep. ID #10048342, MRDS ID #M899929.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: MRDS database Dep. ID #10048342, MRDS ID #M899929.
Pyrite
Formula: FeS2
Description: Considerable.
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 251; Arizona Bureau of Mines file data.
Rhodochrosite
Formula: MnCO3
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Arizona Bureau of Mines file data.
Sphalerite
Formula: ZnS
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 251; Arizona Bureau of Mines file data.
Tetrahedrite
Formula: Cu6Cu4(Fe2+,Zn)2Sb4S12S
Reference: Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 58 (Table 4); Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 251; Arizona Bureau of Mines file data.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
var: Argentiferous Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Tetrahedrite2.GB.05Cu6Cu4(Fe2+,Zn)2Sb4S12S
Group 5 - Nitrates and Carbonates
Cerussite5.AB.15PbCO3
var: Argentiferous Cerussite5.AB.15PbCO3
Rhodochrosite5.AB.05MnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Alunite7.BC.10KAl3(SO4)2(OH)6
Group 8 - Phosphates, Arsenates and Vanadates
Chenevixite8.DD.05Cu2Fe3+2(AsO4)2(OH)4
Group 9 - Silicates
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)([Si/Al]Si2O10)(OH/F)2
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
3 <ø < 4
Tetrahedrite3.3.6.1Cu6Cu4(Fe2+,Zn)2Sb4S12S
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Cerussite14.1.3.4PbCO3
Rhodochrosite14.1.1.4MnCO3
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Alunite30.2.4.1KAl3(SO4)2(OH)6
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq·xH2O
Chenevixite42.7.10.1Cu2Fe3+2(AsO4)2(OH)4
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.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Cerussite
var: Argentiferous Cerussite
-PbCO3
Galena
var: Argentiferous Galena
-PbS
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H ChenevixiteCu2Fe23+(AsO4)2(OH)4
H AluniteKAl3(SO4)2(OH)6
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H KaoliniteAl2(Si2O5)(OH)4
H Limonite(Fe,O,OH,H2O)
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C Cerussite (var: Argentiferous Cerussite)PbCO3
C RhodochrositeMnCO3
C CerussitePbCO3
OOxygen
O Cerussite (var: Argentiferous Cerussite)PbCO3
O RhodochrositeMnCO3
O ChenevixiteCu2Fe23+(AsO4)2(OH)4
O AluniteKAl3(SO4)2(OH)6
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O KaoliniteAl2(Si2O5)(OH)4
O Limonite(Fe,O,OH,H2O)
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O CerussitePbCO3
O MuscoviteKAl2(AlSi3O10)(OH)2
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
AlAluminium
Al ChenevixiteCu2Fe23+(AsO4)2(OH)4
Al AluniteKAl3(SO4)2(OH)6
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al KaoliniteAl2(Si2O5)(OH)4
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si KaoliniteAl2(Si2O5)(OH)4
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S Galena (var: Argentiferous Galena)PbS
S PyriteFeS2
S SphaleriteZnS
S BorniteCu5FeS4
S TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
S ChalcopyriteCuFeS2
S AluniteKAl3(SO4)2(OH)6
S GalenaPbS
KPotassium
K AluniteKAl3(SO4)2(OH)6
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
MnManganese
Mn RhodochrositeMnCO3
FeIron
Fe PyriteFeS2
Fe BorniteCu5FeS4
Fe TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Fe ChalcopyriteCuFeS2
Fe ChenevixiteCu2Fe23+(AsO4)2(OH)4
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe Limonite(Fe,O,OH,H2O)
CuCopper
Cu BorniteCu5FeS4
Cu TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Cu ChalcopyriteCuFeS2
Cu ChenevixiteCu2Fe23+(AsO4)2(OH)4
ZnZinc
Zn SphaleriteZnS
Zn TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
AsArsenic
As ChenevixiteCu2Fe23+(AsO4)2(OH)4
SbAntimony
Sb TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
PbLead
Pb Cerussite (var: Argentiferous Cerussite)PbCO3
Pb Galena (var: Argentiferous Galena)PbS
Pb CerussitePbCO3
Pb GalenaPbS
USGS MRDS Record:10048342
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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