| Deposit ID | 10400191 |
|---|---|
| Record type | Deposit |
| Current site name | Butte, Veins (Anaconda) |
| Geographic coordinates: | -112.53089, 46.0199 (WGS84) |
|---|
Political divisions (FIPS codes)
Silver Bow(county)
Montana(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Butte North(quadrangle 1:24,000 scale)
Butte North(quadrangle 1:100,000 scale)
Butte(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Clark Fork(hydrologic unit)
Pend Oreille(hydrologic accounting unit)
Kootenai-Pend Oreille-Spokane(hydrologic subregion)
Pacific Northwest(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | Montana | Silver Bow |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Silver | Primary |
| Copper | Primary |
| Lead | Secondary |
| Zinc Critical | Secondary |
| Manganese Critical | Secondary |
| Cadmium | Secondary |
| Bismuth Critical | Secondary |
| Selenium | Secondary |
| Tellurium Critical | Tertiary |
| Model code | 85 |
|---|---|
| USGS model code | 22c |
| Deposit model name | Polymetallic veins |
| Mark3 model number | 46 |
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Quartz Monzonite | ||
| Rock unit name | BUTTE QUARTZ MONZONITE | ||
| |||
| Host or associated | Associated | ||
|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Quartz Monzonite | ||
| Rock unit name | QUARTZ PORPHYRY DIKES AND PLUGS | ||
| |||
| (1) | -112.53089, 46.0199 |
|---|
| Type of structure | Local |
|---|---|
| Structure name | Northeast striking normal faults |
| Operation type | Surface-Underground |
|---|---|
| Development status | Past Producer |
| Significant | Yes |
| Discovery year | 1875 |
| Year of first production | 1880 |
| Year of last production | 2000 |
| Production years | 1880-1983, 1985-2000 |
| District name | Butte |
|---|
| Year | 1975 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1880-1975 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Material | ore | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ore mined | 249583000mt | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accuracy | Accurate | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Type | In-situ |
|---|---|
| Name | Cu |
| Estimate year | 1985 |
| Total resources | 1440000mt ore |
| Type | In-situ | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 2002 | ||||||||||||||||||||||||||||
| Total resources | 249532000mt ore | ||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||
| Type | In-situ |
|---|---|
| Name | Pb |
| Estimate year | 1985 |
| Total resources | 37000mt ore |
| Type | In-situ |
|---|---|
| Name | Au |
| Estimate year | 2002 |
| Total resources | 75mt ore |
| Type | In-situ |
|---|---|
| Name | Zn |
| Estimate year | 1985 |
| Total resources | 2334000mt ore |
| Type | In-situ |
|---|---|
| Name | Ag |
| Estimate year | 2002 |
| Total resources | 9260mt ore |
SEE "Montana Resources", Deposit ID 10173000 for full Butte Deposit, references
Long, 1992
Miller, R.N., 1973, Guidebook for the Butte field meeting of the Society of
Economic Geologists, Butte, MT: Montana Bureau of Mines and Geology,
Butte, MT, August 18?21, 1973.
USBM Minerals Yearbook 1973-75
Montana Mining Properties Inc., Mineral Asset Summary @ http://members.aol.com/MontanaMining/
Rusk, B.G., Reed, M.H., Dilles, J.H., and Bodnar, R.J., 2000, Magmatic fluid evolution from an ancient magmatic-hydrothermal system: The porphyry copper-molybdenum deposit, Butte, MT: Geological Society of America Abstracts with Programs, v. 32, no. 7, p. 399.
Anaconda 1973-75 SEC Form 10K
| Subject category | Comment text |
|---|---|
| Deposit | SEE "Montana Resources", Deposit ID 10173000 for full description of the Butte Deposit |
| Deposit | Quartz-Molybdenite Veins, "S" Veins Which Are Transitional To Main Stage Veins Which Are The Anaconda, Blue, And Steward Systems. In The Anaconda System The Veins Strike About N65-80e And Dip Steeply S In The Outer Part Of The District. In The Central Part They Strike N75-80w And Dip Steeply N To S. Except For The En-Echelon Gaps, The Major Veins Of This System Contained The Best Vein Ore In The District. The Blue System Veins Strike NW And Are Best Developed In The Central Part Of The District. Within A Core Zone At Depth They Occur To The Exclusion Of Veins Of The Anaconda System. In The Outer Parts Of The District The Blue System Veins Are Rare And The Anaconda Veins Are Dominant. The Blue System Veins Are Barren Near The Surface And Improve With Depth. In The S Part Of The District They Surpass The Anaconda System On The Deeper Levels As Producers. The Hanging Wall Steward System Strikes E-W To N75e And Dips 30-50s. These Veins Improve With Depth. These Were The Copper Vein Systems. The Other Class Of Ore Is The Siliceous Silver. The Copper Ores Contain A Little Silver; The Ag Ores Rarely Contain Cu; Both Cu And Ag Ores Contain Little Au, And The High-Grade Ag Ore Contain Important Amounts Of Au. The Ag-Bearing Area Is Much Larger Than The Cu-Bearing Area, Which Laps Around On The N And W. In This Large Area The Veins Occur In Six Different Clusters. The Lexington Group Strikes N75e To S65e. Rainbow Group Which Include The Valdemere System, NE Cross Veins And The Rainbow Lode. The Northern Or Wabash Group Are Shallow And Are Not Profitable. The Missoula Gulch Group Border The Copper Veins. The Western Or Aplite Group, The Veins Are In Aplite. The Southern And Eastern Groups Also Have Manganese With The Ag. Guilbert And Park (1986) Related Butte To Cordilleran Vein Deposits. Perry (1932) Classified Butte As Fissure-Filling And Replacement Vein. |
| Deposit | Ore Materials-CHALCOCITE (COPPER GLANCE), BORNITE (PEACOCK COPPER), ENARGITE, CHALCOPYRITE, COVELLITE (INDIGO COPPER), TENNANTITE, TETRAHEDRITE (GRAY COPPER), MANGANESE OXIDE, PYROLUSITE, PSILOMELANE, GALENA, SPHALERITE (ZINC BLENDE), NATIVE SILVER, ACANTHITE (ARGENTITE), STEPHANITE, RUBY SILVERS, DIGINITE, CUPRITE, MALACHITE, AZURITE, NATIVE GOLD, MOLYBDENITE, NATIVE COPPER, RHODOCHROSITE |
| Deposit | Veins: East-West Striking Anaconda Veins, Northwest-Striking Blue Fault Veins, The Anaconda Veins Strike N60-70e In The Western Part Of The District, Dip Steeply North To The North But Overturn With Increasing Depth To Dip South Below The 2,800 Ft Level, They Converge To The West And Downward, And The Dips Flatten Out At The Deeper Levels. To The East, The Anaconda Veins? Strike Changes To The East And The Southeast. The Anaconda Veins Then Disappear In The Central Zone And Re-Appear Several Thousand Feet Eastward. Most Of The Vein Ore Mined In Butte Came From The Anaconda Veins. The Blue Fault Veins Offset The Anaconda Veins In A Left-Lateral Sense. They Dip Steeply South (With Some Local North Dips) In The North Part Of The District And Diminish To As Little As 45 Degrees In The South Part. Mineralization Began In The Anaconda Veins And Then The Blue Veins Became Available For Mineralization. Ore Shoots On The Anaconda Veins Are In The Dialational Zone Where The Veins Change Strike Because Of Offset By The Blue Faults. Horsetail Zones ?Break Off? Of The Anaconda Veins In The Eastern Part Of The District. These Are Small Veinlets That ?Finger Out? According To Perry, Into A Spray At Nearly Right Angles To The Main Vein. Sometimes They Are The Terminus Of The Vein. |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.