Geologic information
Identification information
| Deposit ID |
10003472 |
| MRDS ID |
A106230 |
| Record type |
Site |
| Current site name |
Keystone |
Geographic coordinates
|
Geographic coordinates:
|
-149.24268, 61.79956 (WGS84)
|
| Relative position |
On mountainside west of Sydney Creek, approximately 1 mile southwest of the confluence of Sydney Creek with Archangel Creek. This is locality 24 from Figure 9 (Cohen, 1982). Accurate within 1,000 feet. |
| (click for info) |
Geographic areas
| Country |
State |
| United States |
Alaska |
Commodities
| Commodity |
Importance |
| Gold |
Primary |
Materials information
| Materials |
Type of material |
| Gold |
Ore |
| Quartz |
Gangue |
Mineral occurrence model information
| Model code |
273 |
| USGS model code |
36a |
| Deposit model name |
Low-sulfide Au-quartz vein |
| Mark3 model number |
27 |
Host and associated rocks
| Host or associated |
Host |
| Stratigraphic age (youngest) |
Late Cretaceous |
|
Comments on the geologic information
- Geologic Description = Details about the prospect are unavailable. Most likely, a gold-bearing quartz vein(s) cuts the Late Cretaceous Willow Creek Pluton. The Willow Creek Pluton is a zoned pluton. The outer part consists of hornblende quartz diorite and lesser hornblende tonalite; the core consists of hornblende-biotite granodiorite, and lesser hornblende-biotite quartz monzodiorite and biotite quartz monzonite.
- Age = Late Cretaceous or younger; the host of mineralization is the Late Cretaceous Willow Creek Pluton.
- Age = Host rock is Late Cretaceous.
