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Copper World Mine (Helvetia Mine; Black Horse shaft; Brunswick Mine; Little Dave Mine; Owasco Mine), Helvetia, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USAi
Regional Level Types
Copper World Mine (Helvetia Mine; Black Horse shaft; Brunswick Mine; Little Dave Mine; Owasco Mine)Mine
Helvetia- not defined -
Helvetia-Rosemont DistrictMining District
Santa Rita MtsMountain Range
Pima Co.County
ArizonaState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84):
31° 51' 38'' North , 110° 46' 1'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Corona de Tucson5,675 (2011)11.7km
East Sahuarita1,622 (2006)17.8km
Sahuarita25,707 (2017)20.8km
Green Valley21,391 (2011)21.4km
Vail10,208 (2011)21.5km


‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 92, 99-106.

Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima County, Arizona, USGS Bull. 1027-F: 314.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 82.

Drewes, H.D. (1971) Geologic map of the Sahuarita quadrangle, southeast of Tucson, Pima County, Arizona: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-613, 1 sheet, scale 1:48,000.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 124 (Table 4).

Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 102, 166, 402.

USGS Sahuarita Quadrangle topo map.

Arizona Bureau of Mines field notes (1971), vol. 1, no. 2.

MRDS database Dep. ID file #10039406, MRDS ID #M050038; and, Dep. ID #10186445, MAS ID #0040190180.

A former small underground Cu-Ag-Au-W-Mo-Wollastonite mine located in the SW ¼ sec. 13 & NW ¼, sec. 24, T.18S., R.15E. on the Brunswick, Owasko, Little Dave & Copper World patented claims, 1¼ miles east of Helvetia, in the upper west slope of the Santa Rita Range at an elevation of about 4,850 feet, 28 miles SE of Tucson. It lies on a N-S ridge between Sycamore Canyon and Helvetia Gulch. Opened in 1900, abandoned, and reopened in 1906. Owned at times, or in part, by the Helvetia Copper Co.; the Michigan Development Co.; Helvetia Copper Co. of Arizona; Mrs. Lon Blankenship, Tucson (1955); and the Santa Rita Mining Co.

Mineralization is copper sulfides, carbonates, oxides and sulfate; and some spotty, disseminated scheelite and molybdenite along fractures, in irregular pyrometasomatic replacements, and disseminated, in silicated and locally pyritized Naco (Pennsylvanian) limestone and underlying Cambrian Bolsa quartzites along a strong fracture zone accompanying a thrust fault plane. This fault dips steeply Eastward at surface and flattens at the depth of the lower mine workings. The Naco has been silicated and generally fractured for a few hundred feet next to the fault. Sulfide minerals occur along fractures, in irregular replacement bodies, and in disseminated grains within the zone of fracture & silication. The majority of copper minerals are probably secondary after chalcopyrite. The limestone is dark and less crystallized near the fractures and thrust. Alteration includes silicification and pyritization of the limestone, narrow oxidized streaks and contact metamorphic minerals.

The ore consists mainly of soft, earthy, fine-grained, mostly pulverulent sulfides (chalcopyrite, cupriferous pyrite and chalcocite), termed "black glance."

Local structures include thrusts and normal faulting, fracture zones, crushed sedimentary rocks and "homocline." No recognizable ore shoots. Large masses of limestone have been completely converted to wollastonite. The Martin Formation, Epitaph Formation, and the Scherrer Formation occur nearby.

Workings include a 200 foot deep single-compartment shaft and a 500 foot deep inclined, 2-compartment shaft, opened in 1900, later in 1906-March 1909, closed in 1910. There were 4 levels. Workings are 152.4 meters deep. There are 4 main levels: 125 feet (135 level), 215 foot level (200 level), 305 foot level (300 level), and the 395 foot level (400 level); 2 sub-levels at 60 feet (100 level) and 160 feet, below the collar of shaft No. 1; a total of 6,540 feet of underground horizontal workings. A major producer, mainly from 1899 to 1916, with some 42,000 tons of ore avareging better than 5%Cu, about 1 oz. Ag/T, and minor Au (4,250,000 pounds of Cu; $1,000 Au; $20,000 Ag). Total production $705,000 (period values)(for 1900-1910?).

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:

Azurite
Formula: Cu3(CO3)2(OH)2
Reference: Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima Co., AZ, USGS Bull. 1027-F: 314-315.
Chalcanthite
Formula: CuSO4 · 5H2O
Reference: Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima Co., AZ, USGS Bull. 1027-F: 314-315.
Chalcocite
Formula: Cu2S
Description: A little occurs here. Occurs principally as a black coating or film of secondary origin on chalcopyrite and pyrite.
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 124 (Table 4); Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima Co., AZ, USGS Bull. 1027-F: 312, 314-315; Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, AZ, USGS Bull. 582: 102; Arizona Bureau of Mines file data.
Chalcopyrite
Formula: CuFeS2
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 124 (Table 4); Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 166; Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima Co., AZ, USGS Bull. 1027-F: 314-315; Arizona Bureau of Mines file data.
Cuprotungstite
Formula: Cu2(WO4)(OH)2
Description: Noted on the 200 level.
Reference: Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 82.
'Garnet Group'
Formula: X3Z2(SiO4)3
Description: A component of garnetiferous contact zone skarn.
Reference: Wilson, E.D. (1941), AZ Bur. of Mines Bull. 148: 36.
'Limonite'
Formula: (Fe,O,OH,H2O)
Description: Occurs as a gangue mineral.
Reference: Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima Co., AZ, USGS Bull. 1027-F: 312.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima Co., AZ, USGS Bull. 1027-F: 314-315.
Molybdenite
Formula: MoS2
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 124 (Table 4); Arizona Bureau of Mines file data.
Powellite
Formula: Ca(MoO4)
Description: Disseminated in garnetiferous contact zone skarn.
Reference: Wilson, E.D. (1941), AZ Bur. of Mines Bull. 148: 36.
Pyrite
Formula: FeS2
Description: Occurs as a gangue mineral.
Reference: Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima Co., AZ, USGS Bull. 1027-F: 312, 314-315.
Scheelite
Formula: Ca(WO4)
Description: Disseminated in garnetiferous contact zone skarn.
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 124 (Table 4); Wilson, E.D. (1941), AZ Bur. of Mines Bull. 148: 36; Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima Co., AZ, USGS Bull. 1027-F: 314-315; Arizona Bureau of Mines file data.
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Description: Occurs in contact-metamorphosed rocks.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 402.
Wollastonite
Formula: CaSiO3
Reference: MRDS database Dep. ID file #10039406, MRDS ID #M050038.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Group 5 - Nitrates and Carbonates
Azurite5.BA.05Cu3(CO3)2(OH)2
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Chalcanthite7.CB.20CuSO4 · 5H2O
Cuprotungstite7.GB.15Cu2(WO4)(OH)2
Powellite7.GA.05Ca(MoO4)
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Wollastonite9.DG.05CaSiO3
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Chalcanthite29.6.7.1CuSO4 · 5H2O
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Powellite48.1.2.2Ca(MoO4)
Scheelite48.1.2.1Ca(WO4)
Basic Anhydrous Molybdates and Tungstates
Cuprotungstite48.3.2.1Cu2(WO4)(OH)2
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Wollastonite65.2.1.1cCaSiO3
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Mixtures, etc.
'Garnet Group'-X3Z2(SiO4)3
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H Limonite(Fe,O,OH,H2O)
H MalachiteCu2(CO3)(OH)2
H AzuriteCu3(CO3)2(OH)2
H ChalcanthiteCuSO4 · 5H2O
H CuprotungstiteCu2(WO4)(OH)2
CCarbon
C MalachiteCu2(CO3)(OH)2
C AzuriteCu3(CO3)2(OH)2
OOxygen
O ScheeliteCa(WO4)
O Garnet GroupX3Z2(SiO4)3
O PowelliteCa(MoO4)
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O Limonite(Fe,O,OH,H2O)
O MalachiteCu2(CO3)(OH)2
O AzuriteCu3(CO3)2(OH)2
O ChalcanthiteCuSO4 · 5H2O
O CuprotungstiteCu2(WO4)(OH)2
O WollastoniteCaSiO3
MgMagnesium
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
SiSilicon
Si Garnet GroupX3Z2(SiO4)3
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Si WollastoniteCaSiO3
SSulfur
S ChalcopyriteCuFeS2
S ChalcociteCu2S
S MolybdeniteMoS2
S PyriteFeS2
S ChalcanthiteCuSO4 · 5H2O
CaCalcium
Ca ScheeliteCa(WO4)
Ca PowelliteCa(MoO4)
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Ca WollastoniteCaSiO3
FeIron
Fe ChalcopyriteCuFeS2
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
CuCopper
Cu ChalcopyriteCuFeS2
Cu ChalcociteCu2S
Cu MalachiteCu2(CO3)(OH)2
Cu AzuriteCu3(CO3)2(OH)2
Cu ChalcanthiteCuSO4 · 5H2O
Cu CuprotungstiteCu2(WO4)(OH)2
MoMolybdenum
Mo MolybdeniteMoS2
Mo PowelliteCa(MoO4)
WTungsten
W ScheeliteCa(WO4)
W CuprotungstiteCu2(WO4)(OH)2

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]

Olenekian - Ediacaran
247.2 - 635 Ma



ID: 2816448
Paleozoic sedimentary rocks

Age: Neoproterozoic to Triassic (247.2 - 635 Ma)

Description: Undivided Paleozoic limestone, dolostone, quartzite, shale, and related sedimentary rocks. (248-544 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:{limestone,dolostone,quartzite}, Minor:{shale}

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

USGS MRDS Record:10039406
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