| Deposit ID | 10310203 |
|---|---|
| MRDS ID | W001404 |
| Record type | District |
| Current site name | Gogebic Iron District (Range) |
| Related records | 10082652, 60001574 |
| Geographic coordinates: | -90.01927, 46.47361 (WGS84) |
|---|---|
| Relative position | AN E-W LINEAR IRON FM. GOING FROM LAKE GOGEBIC |
Political divisions (FIPS codes)
Gogebic(county)
Michigan(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Bessemer(quadrangle 1:24,000 scale)
Ironwood(quadrangle 1:100,000 scale)
Ashland(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Black-Presque Isle(hydrologic unit)
Southcentral Lake Superior(hydrologic accounting unit)
Southern Lake Superior(hydrologic subregion)
Great Lakes(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | Michigan | Gogebic |
| Commodity | Importance |
|---|---|
| Iron | Primary |
| Materials | Type of material |
|---|---|
| Hematite | Ore |
| Goethite | Ore |
| Model code | 241 |
|---|---|
| USGS model code | 34a |
| Deposit model name | Superior Fe (BC name is Lake Superior & Rapitan types iron-formation) |
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Sedimentary Rock > Chemical Sediment > Iron Formation | ||
| Rock unit name | Ironwood Iron-Formation | ||
| Rock description | Ironwood Iron-Formation | ||
| |||
| (1) | -90.01927, 46.47361 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | N dipping sediments ; regional trends: E-W |
| Type of structure | Local |
| Structure description | See individual mines. |
| Strike | 50 - 55 DEG. NORTH |
|---|---|
| Dip | 50 TO 55 DEG. NORTH |
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Significant | Yes |
| Year of first production | 1884 |
| Year of last production | 1967 |
| District name | Gogebic Iron District |
|---|
| Year | 1967 |
|---|---|
| Period | 1884-1967 |
| Material | ore Fe |
| Ore mined | 259307689mt |
| Accuracy | Accurate |
LEITH AND VAN HISE, U. S. G. S., MONOGRAPH 28
HOTCH KISS, W. O., 1919, GEOLOGY OF THE GOGEBIC IRON RANGE AND ITS RELATION TO RECENT MINING DEVELOPMENTS, E. M. J., V. 108, P. 443+
189? MONOGRAPH VAN HISE AND LEITH
1971 GEOL MAP B. SCHMIDT AND H. HUBBARD
| Subject category | Comment text |
|---|---|
| Deposit | THE IRONWOOD IRON FORMATION LIES IN STRATIGRAPHIC SEQUENCE WITH THE OTHER PALEOPROTEROZOIC ROCKS. ALL ROCKS DIP 50 DEG. - 55 DEG. TO THE NORTH. THE STRUCTURE IS THOUGHT TO BE A MONOCLINE OR THE NORTH LIMB OF AN E-W ANTICLINE. THE NORTH DIPPING PALEOPROTEROZOIC ROCKS ARE CUT BY PALEOPROTEROZOIC DIABASE DIKES AND IRON MINERALIZATION SEEMS TO BE ASSOCIATED WITH THE DIKES. THE DIKES ARE ALMOST PERPENDICULAR TO THE DIP OF THE ROCKS. DURING PALEOPROTEROZOIC TIME THE ENTIRE AREA OF MICHIGAN'S UPPER PENINSULA WAS REGIONALLY THERMAL METAMORPHOSED CREATING ZONES OF METAMORPHISM FROM CHLORITE TO SILLIMANITE, EXCLUSIVE OF KYANITE ONLY. THE GOGEBIC IRON RANGE IS IN THE CHLORITE ZONE OF METAMORPHISM; BUT IT SHOULD BE NOTED THAT THIS AREA IS THE LEAST METAMORPHOSED OF ALL THE UPPER PENINSULA - WISCONSIN IRON RANGES. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-NOV-1972 | Cannon, Suzanne S. | U.S. Geological Survey | |
| Updater | 01-NOV-1995 | Sutphin, D.M. (Cannon, W.F.) | U.S. Geological Survey | |
| Editor | 01-MAY-1997 | Mason Jr., G.T. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.