| Deposit ID | 10048523 |
|---|---|
| MRDS ID | MP00113 |
| Record type | Site |
| Current site name | Dunka Pit Cu-Ni deposit |
| Geographic coordinates: | -91.82434, 47.72083 (WGS84) |
|---|---|
| Elevation | 457 |
| Relative position | ABOUT 5 MI NORTHEAST OF BABBITT |
Political divisions (FIPS codes)
St. Louis(county)
Minnesota(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Babbitt NE(quadrangle 1:24,000 scale)
Ely(quadrangle 1:100,000 scale)
Two Harbors(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Rainy Headwaters(hydrologic unit)
Rainy(hydrologic accounting unit)
Rainy(hydrologic subregion)
Souris-Red-Rainy(hydrologic region)
Federal lands
Superior National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Minnesota | St. Louis |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| 4th Principal | 060N;061N | 012W;012W | Minnesota |
| Commodity | Importance |
|---|---|
| Copper | Primary |
| Nickel Critical | Primary |
| Cobalt Critical | Tertiary |
| Platinum Critical | Tertiary |
| Palladium Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Bornite | Ore |
| Chalcopyrite | Ore |
| Cubanite | Ore |
| Millerite | Ore |
| Pentlandite | Ore |
| Pyrrhotite | Ore |
| Sphalerite | Ore |
| Olivine | Gangue |
| Plagioclase | Gangue |
| Pyroxene | Gangue |
| Result | HIGH GRADE SAMPLE FROM DUNKA PIT CONTAINS 10 PPB PT, 960 PPB PD. WEIGHTED AVERAGES OF COMBINED PT+PD=278 PPB, OF CU=0.47%, OF NI=0.19%. MEDIAN OF PT=PD=290 PPB |
|---|
| Model code | 9 |
|---|---|
| USGS model code | 5a |
| Deposit model name | Duluth Cu-Ni-PGE |
| Host or associated | Associated | ||
|---|---|---|---|
| Rock type | Sedimentary Rock > Chemical Sediment > Iron Formation | ||
| Rock unit name | Biwabik Formation | ||
| |||
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Gabbro > Troctolite | ||
| Rock unit name | South Kawishiwi Intrusion | ||
| |||
| (1) | -91.82434, 47.72083 |
|---|
| Type of structure | Local |
|---|---|
| Structure description | Several Ne-Trending Normal Faults Parallel The Midcontinent Rift System Near The Margin. These Faults Formed During The Opening Of The Rift And Controlled Emplacement Of The Troctolitic And Late Intrusions. |
| General form | TABULAR, DISSEMINATED |
|---|
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Large |
| Significant | No |
| District name | Western Margin Duluth Complex |
|---|
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | MP00113 |
CANNON, W.F., 1991, WRITTEN COMMUN. TO M.L. ZINETEK
MORTON, PENELOPE, AND HAUCK, S.A., 1987, PGE, AU AND AG CONTENTS OF CU-NI SULFIDES FOUND AT THE BASE OF THE DULUTH COMPLEX, NORTHEASTERN MINNESOTA: NATURAL RESOURCES RESEARCH INSTITUTE TECHNICAL REPORT NRRI/GMIN-TR-87-04, 81 P.
| Subject category | Comment text |
|---|---|
| Deposit | SPECIFIC SIZE INFORMATION NOT AVAILABLE FOR THIS DEPOSIT BUT IT IS PRESUMED LARGE LIKE OTHERS IN DULUTH COMPLEX |
| Deposit | SULFIDES ORIGINATED AS INTERCUMULATE IN LITHIFYING TROCTOLITE WHEN SULFUR WAS INTRODUCED INTO LIQUID FRACTION CREATING IMMISCIBLE SUFLIDE AND SILICATE LIQUIDS. HIGHER DENSITY OF SULFIDE AND BASAL INTRODUCTION OF SULFUR CREATED BASAL LOCALIZATION. VARIATION IN SULFUR SOURCE, PATHWAYS, AND FAULTING CREATED LOCAL VARIATION AND HIGHER HORIZONS. SEE MORTON AND HAUCK (1987) FOR FURTHER ANALYTICAL DATA. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-NOV-1991 | Peterson, Jocelyn A. | U.S. Geological Survey | |
| Editor | 28-FEB-2005 | Woodruff, L.G. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.