| Deposit ID | 10094083 |
|---|---|
| MRDS ID | A013372 |
| Record type | Site |
| Current site name | Red Bluff Bay Chromite Prospects |
| Related records | 10161197 |
| Geographic coordinates: | -134.71027, 56.86444 (WGS84) |
|---|---|
| Elevation | 107 |
| Relative position | 1.15 MI. NE OF TRIANGULATION STATION STEEP, N OF RED BLUFF BAY |
Political divisions (FIPS codes)
Alaska(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Port Alexander D-3 SE(quadrangle 1:24,000 scale)
Port Alexander NE(quadrangle 1:100,000 scale)
Port Alexander(quadrangle 1:250,000 scale)
Federal lands
Tongass National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
South Baranof Wilderness(Wilderness)
Wilderness FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State |
|---|---|
| United States | Alaska |
| Commodity | Importance |
|---|---|
| Chromium Critical | Primary |
| Materials | Type of material |
|---|---|
| Chromite | Ore |
| Olivine | Gangue |
| Pyroxene | Gangue |
| Serpentine | Gangue |
| Result | ORE VARIES FROM 18.65% - 50.56% CR2 O3 - USGS B 936-G, P. 181 |
|---|
| Host or associated | Associated |
|---|---|
| Rock type | Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite |
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite |
| (1) | -134.71027, 56.86444 |
|---|
| Type of structure | Local |
|---|---|
| Structure description | Phyllite And Schist Country Rock In Open Folds Trending N 30 Degrees W, Plunging 10 Degrees-50 Degrees Se |
| General form | TABULAR, LENS, POD |
|---|---|
| Thickness | 45.72M |
| Length | 91.44M |
| Width | 9.14M |
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1933 |
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1942 | ||||||||||||||
| Total resources | 254000mt ore | ||||||||||||||
| |||||||||||||||
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1942 | ||||||||||||||
| Total resources | 12000mt ore | ||||||||||||||
| |||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | A013372 |
USGS B 936-G, PLATE 22 (1942)
USGS OF 78-787, P. 21 (1978)
USGS MF-464, LOC. 14 (1972)
BAG-B-936-G-PL-22-1,2
USGS B936-G, P. 186
| Subject category | Comment text |
|---|---|
| Deposit | CHROMITE OCCURS AS THIN TABULAR BODIES AND LENSES IN SERPENTINIZED DUNITE, PARALLEL TO SERPENTINIZED PYROXENITE LAYERS IN SILL-LIKE CONCORDANT BODY THAT INTRUDED PHYLLITE AND GREENSTONE SCHIST. 8 ORE BODIES RANGE UP TO A MAXIMUM OF 300 FT. LONG AND 30 FT. WIDE. THE 5 SMALLER DEPOSITS ARE HIGHER GRADE, WITH LAYERS OF BARREN DUNITE SEPERATING HIGH-GRADE CHROMITE LAYERS. 3 LARGER DEPOSITS ARE LOW GRADE, WITH CHROMITE-RICH MASSES OF DUNITE IN WHICH CHROMITE IS DISSEMINATED AS SMALL PODS AND LENSES OF SOLID ORE. |
| Deposit | MOST CHROMITE BODIES TOO SMALL TO BE ECONOMIC, LARGER ZONES MAY POSSIBLY BE ECONOMIC AS CONCENTRATING ORE. HIGH IRON CONTENT MAKES CHROMITE UNDESIRABLE. ; INFO.SRC : 1 PUB LIT |
| Deposit | THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JUL-1987 | Niles, L.P. (Huber, D.F.) | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.