Swennings Greenpoint Occurrence, Hyder Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Swennings Greenpoint Occurrence | Occurrence |
| Hyder Mining District | Mining District |
| Prince of Wales-Hyder Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
56° 0' 54'' North , 130° 15' 50'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Stewart | 496 (2013) | 19.4km |
Mindat Locality ID:
200262
Long-form identifier:
mindat:1:2:200262:3
GUID (UUID V4):
a6874f02-137d-44f0-a87f-d0517e4ba28e
Claims were inactive in 1973. Site is in Misty Fiords National Monument.
Location: The Swennings Greenpoint mineral occurrence is in Section 33 above Greenpoint Glacier at an elevation of about 4200 feet (Berg and others, 1977, p. 92; Elliott and Koch, 1981, p. 13, loc. 36). This location is accurate to within about a quarter of a mile.
Geology: The country rocks in the area of this occurrence are pelitic metasedimentary strata of the Jurassic or older Mesozoic Hazelton Group, which are underlain and locally intruded by the Triassic Texas Creek Granodiorite; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Berg and others, 1977, p. 15-17, 22-23; Koch, 1996). The deposit consists of quartz veins in Hazelton hornfels about 50 feet from the contact of a dike of Hyder Quartz Monzonite (Berg and others, 1977, p. 92-93). The veins, which strike N30W and dip 65-70NE, are iron stained and contain scattered knots of galena and molybdenite. Assays of samples collected in 1972 by the U.S. Bureau of Mines showed as much as 100 ppm Ag, 350 ppm Cu, 4.5% Pb, 1000 ppm Zn, and 2000 ppm Mo. Lead-isotope studies of galena from the Swennings Greenpoint occurrence (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
Workings: Assays of samples collected in 1972 by the U.S. Bureau of Mines (Berg and others, 1977) showed as much as 100 ppm Ag, 350 ppm Cu, 4.5% Pb, 1000 ppm Zn, and 2000 ppm Mo.
Age: Lead-isotope studies of galena from the Swennings Greenpoint occurrence (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
Alteration: Local intense iron staining of quartz veins
Commodities (Major) - Ag, Mo, Pb; (Minor) - Cu, Zn
Development Status: None
Deposit Model: Polymetallic veins
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Galena | PbS |
| S | ⓘ Molybdenite | MoS2 |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | BC036 |
|---|
Other Regions, Features and Areas containing this locality
- StikiniaVolcanic Arc
- Taku DomainDomain
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