Easter Prospect, Ketchikan Gateway Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Easter Prospect | Prospect |
| Ketchikan Gateway Borough | Borough |
| Alaska | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
55° 24' 14'' North , 131° 48' 32'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Ketchikan | 8,197 (2017) | 12.3km |
| Saxman | 417 (2017) | 16.5km |
| Metlakatla | 1,405 (2017) | 34.0km |
Location: The Easter prospect is at an elevation of about 150 feet in or near the valley of an unnamed, northeast-flowing creek that enters the west side of the north end of Tongass Narrows, about 0.5 mile south of Rock Point. The site is in section 36, T. 74 S., R. 89 E., of the Copper River Meridian. It corresponds to loc. 54 in Elliott and others (1978), and to loc. 265 in Maas and others (1995). The location is accurate within 0.1 mile.
Geology: The country rocks on northern Gravina Island are chiefly Upper Jurassic to mid-Cretaceous andesitic and basaltic volcanic rocks that gradationally intertongue with flyschlike sedimentary rocks. The rocks are intruded by at least one pluglike body of Tertiary gabbro (Berg, 1973; Berg and others, 1988). The bedded rocks were regionally metamorphosed to low-greenschist grade in Late Cretaceous time, and subsequently contact metamorphosed to hornblende hornfels near the contact of the Tertiary gabbro. The country rocks are cut by a high-angle fault along Tongass Narrows that displays about 4 miles of right-lateral offset. The deposit is in slate and greenschist and consists of quartz fissure veins up to two feet thick that contain pyrite, a trace of arsenopyrite, and free gold (Brooks, 1902, p. 62-63). The principal vein was traced on the surface for 3800 feet. It strikes NW and dips steeply NE, at an angle to the foliation of the schist. Around 1901, the owners reported gold values of $3-$400/ton (Au at $20.67/oz.). At that time, the deposit had been explored by a six-foot-deep pit.
Workings: Around 1901, the owners reported gold values of $3-$400/ton (Au at $20.67/oz.). At that time, the deposit had been explored by a six-foot-deep pit.
Age: Late Cretaceous or younger.
Commodities (Major) - Au
Development Status: None
Deposit Model: Low-sulfide gold-quartz veins (Cox and Singer, 1986; model 36a)
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:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| 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 | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Pyrite | FeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | KC057 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
