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Heavy Weight Mine (Light Weight Mine), Heavy Weight Hill, Helvetia, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USAi
Regional Level Types
Heavy Weight Mine (Light Weight Mine)Mine
Heavy Weight HillHill
Helvetia- not defined -
Helvetia-Rosemont DistrictMining District
Santa Rita MtsMountain Range
Pima Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
31° 51' 47'' North , 110° 46' 35'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Corona de Tucson5,675 (2011)11.4km
East Sahuarita1,622 (2006)16.9km
Sahuarita25,707 (2017)19.9km
Green Valley21,391 (2011)20.5km
Vail10,208 (2011)21.4km


A former small underground Cu-Ag-Au-Be mine located in the SE ¼ sec. 14, T.18S., R.15E., ¾ mile NE of Helvetia and ½ mile NE of the Copper World and Leader Mines, 28 miles SE of Tucson, on private land. It lies on the steep southwest slope of Heavy Weight Hill, at the east end of a traverse ridge or spur. Comprised of the Heavy Weight and Light Weight claims. Discovered 1887. Opened late in the 1880's. Produced 1889-1902. Owned at times, or in part, by the Helvetia Copper Co.; Michigan-Arizona Development Co.; and the Helvetia Copper Co. of Arizona.

Mineralization is irregular, pyrometasomatic replacement orebodies containing copper carbonates and sulfides in silicified, garnetized, sheared, and thrust-faulted Paleozoic Concha limestone along a contact with reddish-gray Laramide quartz latite porphyry intrusive. The shear zone strikes S25W and dips steeply SE. The rocks have been locally considerably disturbed, sheared, and faulted. The intrusive rock has a fine-granular groundmass of orthoclase, oligoclase, quartz, and hornblende in which rest phenocrysts to 0.4 inches (1 cm) long of oligoclase, orthoclase, and quartz. In general it underlies the limestone.

The ores consist principally of the common sulfides and carbonates of copper.

Local structures include thrust and normal faulting, fracture zones, homoclinal. Regional trends include tilting and broad open folds in the south and extensive faulting in the north.

Workings include tunnel operations and cuts and are 914.4 meters long. Development totals some 3,000 feet of workings on 3 levels. Closed in 1902 due to low copper prices. Produced some 3,000 tons of ore averaging about 5% Cu and 1.5 oz. Ag/T from the late 1880's to 1902.

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


10 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Description: Phenocrysts to 0.4 inches (1 cm) diameter in wall rocks.
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 110.
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Description: Phenocrysts to 0.4 inches (1 cm) diameter in wall rocks.
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 110.
Azurite
Formula: Cu3(CO3)2(OH)2
Bornite
Formula: Cu5FeS4
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 113.
Calcite
Formula: CaCO3
Chalcopyrite
Formula: CuFeS2
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 113.
Covellite
Formula: CuS
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 113.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 126 (Table 4); Schrader (1915): 110-113; Arizona Bureau of Mines file data.
Malachite
Formula: Cu2(CO3)(OH)2
Colour: Green, brown (iron-stained)
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 112.
Orthoclase
Formula: K(AlSi3O8)
Description: Phenocrysts to 0.4 inches (1 cm) diameter in wall rocks.
Reference: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 110.
Quartz
Formula: SiO2
Wulfenite
Formula: Pb(MoO4)
Reference: rolf luetcke

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
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
Wulfenite7.GA.05Pb(MoO4)
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Orthoclase9.FA.30K(AlSi3O8)
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3

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
Covellite2.8.12.1CuS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Albite
var: Oligoclase
-(Na,Ca)[Al(Si,Al)Si2O8]
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
H AzuriteCu3(CO3)2(OH)2
H MalachiteCu2(CO3)(OH)2
CCarbon
C AzuriteCu3(CO3)2(OH)2
C MalachiteCu2(CO3)(OH)2
C CalciteCaCO3
OOxygen
O Garnet GroupX3Z2(SiO4)3
O AzuriteCu3(CO3)2(OH)2
O MalachiteCu2(CO3)(OH)2
O QuartzSiO2
O CalciteCaCO3
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O OrthoclaseK(AlSi3O8)
O WulfenitePb(MoO4)
O AlbiteNa(AlSi3O8)
NaSodium
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na AlbiteNa(AlSi3O8)
AlAluminium
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al OrthoclaseK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
SiSilicon
Si Garnet GroupX3Z2(SiO4)3
Si QuartzSiO2
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si OrthoclaseK(AlSi3O8)
Si AlbiteNa(AlSi3O8)
SSulfur
S ChalcopyriteCuFeS2
S BorniteCu5FeS4
S CovelliteCuS
KPotassium
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca CalciteCaCO3
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
FeIron
Fe ChalcopyriteCuFeS2
Fe BorniteCu5FeS4
CuCopper
Cu AzuriteCu3(CO3)2(OH)2
Cu MalachiteCu2(CO3)(OH)2
Cu ChalcopyriteCuFeS2
Cu BorniteCu5FeS4
Cu CovelliteCuS
MoMolybdenum
Mo WulfenitePb(MoO4)
PbLead
Pb WulfenitePb(MoO4)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 92, 110-113.
Johnson, V.H. (1941) Geology of the Helvetia mining district, Pima County, Arizona: Tucson, University of Arizona, Ph.D. dissertation, 111 p.
Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima County, Arizona, USGS Bull. 1027-F: 301-323: 320.
Warner, L.A., Holser, W.T., Wilmarth, V.R., and Cameron, E.N. (1959) Occurrence of nonpegmatitic beryllium in the United States: U.S. Geological Survey Professional Paper 318, 198 p., 5 sheets, scales 1:480, 1:960, 1:4,800, 1:500,000: 103.
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: 126 (Table 4).
USGS Sahuarita Quadrangle topo map.
Arizona Bureau of Mines field notes (1971), vol. 1, no. 2.
MRDS database Dep. ID file #10039409, MRDS ID #M050042; and, Dep. ID #10186180, MAS ID #0040190248.

USGS MRDS Record:10039409
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