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Heavy Weight Mine, Heavy Weight Hill, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USAi
Regional Level Types
Heavy Weight MineMine
Heavy Weight HillHill
HelvetiaTown (Former)
Helvetia-Rosemont Mining DistrictMining District
Pima CountyCounty
ArizonaState
USACountry

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Latitude & Longitude (WGS84):
31° 51' 47'' North , 110° 46' 35'' West
Latitude & Longitude (decimal):
31.86306,-110.77639
GeoHash:
G#:9t9jr0rpg
GRN:
N22W67
Type:
Mine
Köppen climate type:
BSk : Cold semi-arid (steppe) climate
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
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Old Pueblo Lapidary ClubTucson, Arizona42km
Tucson Gem and Mineral SocietyTucson, Arizona42km
Mindat Locality ID:
36119
Long-form identifier:
mindat:1:2:36119:9
GUID (UUID V4):
ff04e6e9-e377-4955-bff9-8be83d39a5f0
Other/historical names associated with this locality:
Light Weight Mine


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.

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Detailed Mineral List:

ⓘAlbite
Formula:Na(AlSi3O8)
Description: Phenocrysts to 0.4 inches (1 cm) diameter in wall rocks.
ⓘAlbite var. Oligoclase
Formula:(Na,Ca)[Al(Si,Al)Si2O8]
Description: Phenocrysts to 0.4 inches (1 cm) diameter in wall rocks.
ⓘAnglesite
Formula:PbSO4
References:
Rolf LuetckeIdentification: Visual Identification
ⓘAzurite
Formula:Cu3(CO3)2(OH)2
ⓘBornite
Formula:Cu5FeS4
ⓘCalcite
Formula:CaCO3
ⓘChalcopyrite
Formula:CuFeS2
ⓘCovellite
Formula:CuS
ⓘ'Garnet Group'
Formula:X3Z2(SiO4)3
ⓘMalachite
Formula:Cu2(CO3)(OH)2
Colour: Green, brown (iron-stained)
ⓘOrthoclase
Formula:K(AlSi3O8)
Description: Phenocrysts to 0.4 inches (1 cm) diameter in wall rocks.
ⓘPlumbojarosite
Formula:Pb0.5Fe3+3(SO4)2(OH)6
References:
Rolf LuetckeIdentification: Visual Identification
ⓘQuartz
Formula:SiO2
ⓘWulfenite
Formula:Pb(MoO4)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘBornite2.BA.15Cu5FeS4
ⓘCovellite2.CA.05aCuS
ⓘChalcopyrite2.CB.10aCuFeS2
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAzurite5.BA.05Cu3(CO3)2(OH)2
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘAnglesite7.AD.35PbSO4
ⓘPlumbojarosite7.BC.10Pb0.5Fe3+3(SO4)2(OH)6
ⓘWulfenite7.GA.05Pb(MoO4)
Group 9 - Silicates
ⓘOrthoclase9.FA.30K(AlSi3O8)
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘvar. Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Unclassified
ⓘ'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
HⓘAzuriteCu3(CO3)2(OH)2
HⓘMalachiteCu2(CO3)(OH)2
HⓘPlumbojarositePb0.5Fe33+(SO4)2(OH)6
CCarbon
CⓘAzuriteCu3(CO3)2(OH)2
CⓘCalciteCaCO3
CⓘMalachiteCu2(CO3)(OH)2
OOxygen
OⓘAlbiteNa(AlSi3O8)
OⓘAnglesitePbSO4
OⓘAzuriteCu3(CO3)2(OH)2
OⓘCalciteCaCO3
OⓘMalachiteCu2(CO3)(OH)2
OⓘAlbite var.Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
OⓘOrthoclaseK(AlSi3O8)
OⓘPlumbojarositePb0.5Fe33+(SO4)2(OH)6
OⓘQuartzSiO2
OⓘWulfenitePb(MoO4)
OⓘGarnet GroupX3Z2(SiO4)3
NaSodium
NaⓘAlbiteNa(AlSi3O8)
NaⓘAlbite var.Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
AlAluminium
AlⓘAlbiteNa(AlSi3O8)
AlⓘAlbite var.Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
AlⓘOrthoclaseK(AlSi3O8)
SiSilicon
SiⓘAlbiteNa(AlSi3O8)
SiⓘAlbite var.Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
SiⓘOrthoclaseK(AlSi3O8)
SiⓘQuartzSiO2
SiⓘGarnet GroupX3Z2(SiO4)3
SSulfur
SⓘAnglesitePbSO4
SⓘBorniteCu5FeS4
SⓘChalcopyriteCuFeS2
SⓘCovelliteCuS
SⓘPlumbojarositePb0.5Fe33+(SO4)2(OH)6
KPotassium
KⓘOrthoclaseK(AlSi3O8)
CaCalcium
CaⓘCalciteCaCO3
CaⓘAlbite var.Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
FeIron
FeⓘBorniteCu5FeS4
FeⓘChalcopyriteCuFeS2
FeⓘPlumbojarositePb0.5Fe33+(SO4)2(OH)6
CuCopper
CuⓘAzuriteCu3(CO3)2(OH)2
CuⓘBorniteCu5FeS4
CuⓘChalcopyriteCuFeS2
CuⓘCovelliteCuS
CuⓘMalachiteCu2(CO3)(OH)2
MoMolybdenum
MoⓘWulfenitePb(MoO4)
PbLead
PbⓘAnglesitePbSO4
PbⓘPlumbojarositePb0.5Fe33+(SO4)2(OH)6
PbⓘWulfenitePb(MoO4)

Other Databases

Link to USGS MRDS:10039409

Other Regions, Features and Areas containing this locality

Mexico
North America
North America PlateTectonic Plate
North America Plate
USA

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, pleaseregister so you can add to our database. This locality information is for reference purposes only. You should never attempt tovisit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holdersfor access and that you are aware of all safety precautions necessary.

References

USGS Sahuarita Quadrangle topo map.
MRDS database Dep. ID file #10039409, MRDS ID #M050042; and, Dep. ID #10186180, MAS ID #0040190248.
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.
Arizona Bureau of Mines field notes (1971), vol. 1, no. 2.
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).
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