| Deposit ID | 10002338 |
|---|---|
| MRDS ID | A013252 |
| Record type | Site |
| Current site name | Mirror Harbor Copper-Nickel Prospect |
| Related records | 10258629 |
| Geographic coordinates: | -136.32093, 57.79443 (WGS84) |
|---|---|
| Elevation | 3 |
| Relative position | ON NORTH TIP OF FLEMING ISLAND. |
Political divisions (FIPS codes)
Sitka(Borough)
Alaska(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Sitka D-7(quadrangle 1:63,360 scale)
Sitka NW(quadrangle 1:100,000 scale)
Sitka W OE(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Central Southeast Alaska(hydrologic accounting unit)
Southeast Alaska(hydrologic subregion)
Alaska(hydrologic region)
Federal lands
National Forest(land status)
| Country | State |
|---|---|
| United States | Alaska |
| Commodity | Importance |
|---|---|
| Nickel Critical | Primary |
| Copper | Primary |
| Materials | Type of material |
|---|---|
| Chalcopyrite | Ore |
| Niccolite | Ore |
| Pentlandite | Ore |
| Pyrrhotite | Ore |
| Plagioclase | Gangue |
| Pyroxene | Gangue |
| Result | AVERAGE OF 37 FT. OF ORE SAMPLES AT 75 FT. LEVEL DRIFT TAKEN IN 1917 IS 3.42% NI AND 1.58% CU, WITH MAXIMUM VALUES OF 5.70% NI AND 4.00% CU, ACCORDING TO USGS B 947-C, TABLE 17, NOS. 4-17. INDICATED AVERAGE GRADE OF DEPOSIT FROM DIAMOND DRILL HOLE CORES AND CHANNEL SAMPLES BY USBM IN 1942 IS 1.54% NI AND 0.78% CU, ACCORDING TO USGS B 947-C, P. 62. |
|---|
| Host or associated | Associated | ||
|---|---|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Diorite | ||
| |||
| Host or associated | Associated |
|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Gabbro > Norite |
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Gabbro > Norite |
| General form | POD |
|---|---|
| Plunge direction | 75 DEGREES SE |
| Thickness | 33.53M |
| Length | 12.19M |
| Width | 6.1M |
| Depth to top | 0M |
| Depth to bottom | 53.34M |
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1911 |
| District name | Chichagof |
|---|
| Ownership category | National Forest |
|---|
| Type | In-situ | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1946 | |||||||||||||||||||||
| ||||||||||||||||||||||
| Type of workings | Surface |
|---|---|
| Area | 0.007HA |
| Length | 100.58M |
| Overall depth | 53.34M |
| Overall length | 12.19M |
| Overall width | 6.1M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | A013252 |
USGS B 947-C, P. 56-63, PLATES 15, 16 (1946)
USGS B 936-I, P. 221-243 (1942)
USGS MF-467, LOC. 16 (1972)
USGS OF 78-450, P. 82-84 (1978)
USBM OFR 20-73, LOC. 153B (1978)
BAG-B-947-C-PL-15, 16
| Subject category | Comment text |
|---|---|
| Deposit | MAGMATIC SEGREGATIONS OF PYRRHOTITE, PENTLANDITE, CHALCOPYRITE, AND MINOR NICCOLITE OCCUR LARGELY AS SMALL PODS (UP TO 4 IN. BY 4 IN. BY 8 IN.) IN NEARLY BARREN NORITE BODY. NORITE ALSO CONTAINS LOW-GRADE DISSEMINATIONS OF SULFIDES. NORITE IS PART OF COMPOSITE STOCK AND IS IN CONTACT WITH DIORITE. SULFIDE-BEARING PORTION OF NORITE IS 40 FT. LONG AND 20 FT. WIDE AT SURFACE, AND EXTENDS TO AVERAGE DEPTH OF 110 FT. WHERE IT IS CUT OFF BY N 80 DEGREES E STRIKING, 75 DEGREES N DIPPING FAULT. MASSIVE SULFIDE-BEARING ORE IS FOUND AT THE 175 FT. LEVEL DRIFT IN SHAFT. DEPOSIT FORMS PIPE-SHAPED BODY PLUNGING 75 DEGREES SE, AND IS SURROUNDED BY BARREN NORITE NEAR DIORITE CONTACT. |
| Deposit | LUMPED INTO SAME DEPOSIT AS SI-17 AND SI-18 (DAVISON BAY) BY COBB IN MF-467, LOC. 16 AND OF 78-450, P. 82-84. NO PRODUCTION RECORDED, ALTHOUGH CONSIDERABLE AMOUNT OF ORE WAS MINED. ; 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-MAY-1987 | Leonard, Kenneth R. (Huber, Donald F.) | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
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