Unnamed Occurrence (ARDF - NM055; head of Jett Creek), Nome Mining District, Nome Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - NM055; head of Jett Creek) | - not defined - |
| Nome Mining District | Mining District |
| Nome Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 51' 1'' North , 165° 8' 41'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Nome | 3,806 (2018) | 40.8km |
Location: This occurrence is on the ridge crest between the headwaters of David and Jett Creeks at an elevation of 2,250 feet. This is locality 25 of Hummel (1962 [MF 248]) and locality 18 of Cobb (1972 [MF 463], 1978 [OFR 78-93]).
Geology: Hummel (1962 [MF 248]) noted this locality as an occurrence of copper-bearing minerals. It may be similar to other copper prospects in the area, such as Copper Mountain (NM054), Copper King (NM051), and Copper Creek (NM053). These are copper carbonate and copper sulfide-bearing silica-rich zones in metacarbonate rocks. Country rocks at this locality are interlayered pelitic schist and marble structurally overlain a short distance to the south by chloritic and mafic schist (Thurston, 1985, figure 3A). These metamorphic rocks are part of the Nome Group derived from Proterozoic to early Paleozoic protoliths (Till and Dumoulin, 1994). The Nome Group underwent regional blueschist facies metamorphism in the Late Jurassic or Early Cretaceous (Sainsbury, Coleman, and Kachadoorian, 1970; Forbes and others, 1984; Thurston, 1985; Armstrong and others, 1986; Hannula and McWilliams, 1995). The blueschist facies rocks were recrystallized to greenschist facies or higher metamorphic grades in conjunction with regional extension, crustal melting, and magmatism in the mid-Cretaceous (Hudson and Arth, 1983; Miller and Hudson, 1991; Miller and others, 1992; Dumitru and others, 1995; Hannula and others, 1995; Hudson, 1994; Amato and others, 1994; Amato and Wright, 1997, 1998). Lode gold mineralization on Seward Peninsula is mostly related to the higher temperature metamorphism in the mid-Cretaceous (Apodoca, 1994; Ford, 1993 [thesis]; Ford and Snee, 1996; Goldfarb and others, 1997). The relation of this occurrence to the lode gold deposits is uncertain. A mid-Cretaceous age for the nearly stratabound copper deposits is possible. The deposits could, however, have formed in the late Proterozoic or in the early Paleozoic, synchronous with known periods of early plutonism on the Seward Peninsula.
Workings: Small prospecting pits may be present.
Age: Late Proterozoic, early Paleozoic, or mid-Cretaceous.
Alteration: Development of silica-rich layers, formation of white mica, bleaching of marble (?), and oxidation.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Carbonate-hosted, sulfide-bearing silica-rich rock.
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.List of minerals for each chemical element
Other Databases
| Link to USGS - Alaska: | NM055 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Brooks-Seward DomainDomain
- Nome ComplexAccretionary Complex
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