Mount Howard occurrence, Kuiu Island, Petersburg Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Mount Howard occurrence | Occurrence |
| Kuiu Island | Island |
| Petersburg Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
56° 6' 35'' North , 134° 10' 48'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Other/historical names associated with this locality:
ARDF - PA040
Location: This occurrence is about 0.8 mile west-northwest of Mount Howard and about 0.3 mile east of the northwest corner of section 31, T. 66 S. R. 73 E. Figure 6 of Still and others (2002) is a map of the deposit; the location is accurate.
Geology: This occurrence was first described by Roehm (1942) and was recently mapped and sampled by Still and others (2002). The deposit consists of several quartz veins with an aggregate thickness of about 6 feet. The veins are associated with a fault zone and are generally parallel to the bedding of the folded host rocks, which are limestone, silty limestone, and chert. The rocks are part of the Bay of Pillars Formation of Silurian age (Brew and others, 1984). A large Cretaceous hornblende quartz monzonite crops out about a mile to the east. The veins, fault zone, and strata generally strike N60W and dip 75 SW to vertical. The veins contain irregular masses, bands, and disseminations of pyrite with minor sphalerite and galena. The highest grade sample collected by Still and others (2002) across 1.3 feet of a quartz vein contained 134 parts per billion gold, 2,959 parts per million (ppm) zinc, and 1,264 ppm arsenic. Another sample contained 15 ppm silver and 353 ppm lead across 0.7 feet and a sulfide-rich sample collected in the quartz vein contained 25.2 ppm silver, 1,153 ppm copper, 8,692 ppm lead and 14,558 ppm zinc.
Workings: Only surface sampling.
Age: The veins cut Silurian strata and may be related to a nearby Cretaceous quartz monzonite stock.
Commodities (Major) - Ag, As, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Polymetallic quartz vein (Cox and Singer, 1986; model 22c).
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Galena Formula: PbS |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| 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 | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | PA040 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
USA
- Alaska
- Petersburg Borough
- Kupreanof Mining DistrictMining District
- ⭔Wrangell-Petersburg Census AreaBorough
- Petersburg Borough
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References
Roehm, J. C. (1942) Summary report of mining investigations and itinerary of J.C. Roehm in the Ketchikan, Wrangell, Petersburg and Juneau mining precincts. Alaska Territorial Department of Mines Itinerary Report IR 195-33. Alaska Territorial Department of Mines 23 pp.
