Eagle River; Mayflower Prospect, Anchorage Mining District, Anchorage, Alaska, USAi
Regional Level Types | |
---|---|
Eagle River; Mayflower Prospect | Prospect |
Anchorage Mining District | Mining District |
Anchorage | Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
61° 7' 48'' North , 149° 5' 24'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Girdwood | 2,250 (2017) | 21.2km |
Eagle River | 24,793 (2013) | 33.3km |
Knik River | 744 (2011) | 37.9km |
Whittier | 214 (2018) | 45.1km |
Butte | 3,246 (2011) | 45.9km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
Club | Location | Distance |
---|---|---|
Chugach Gem & Mineral Society | Anchorage, Alaska | 45km |
Mindat Locality ID:
197309
Long-form identifier:
mindat:1:2:197309:2
GUID (UUID V4):
1385c9b1-60e6-48e3-9f97-eee3d6f02ba0
Property originally known as the Mayflower lode (Park, 1933).
Location: Prospect located near the south bank of Eagle River, 4,500 ft west-northwest of the terminus of Eagle Glacier. Accurate within 2,000 ft. Locality 7 on plate 33 of Park (1933), locality 51 of Cobb (1972), and locality 40 of MacKevett and Holloway (1977).
Geology: Mineralized quartz veins in fine-grained, massive metagraywacke of the Late Cretaceous Valdez Group. The host rock shows sheared zones that strike N 5 W and are vertical or dip about 65 NW. Several large interbedded conglomerate lenses and minor argillite are present within the graywacke. Mineralized quartz veins that are less than 1 ft thick and that can be traced for 400 ft, are found in two sheared zones 50 ft apart (Park, 1933). Quartz veins contain galena, pyrite, sphalerite, arsenopyrite, chalcopyrite, and limited malachite. Assays show 0.05 oz/ton Au and 10 to 25 oz/ton Ag (Park, 1933). Calcite veinlets found in joints of graywacke (Martin and others, 1915). The most conspicous quartz vein can be traced south of the river and probably is also exposed to the north of Eagle River.
Workings: Assays show 0.05 oz/ton Au and 10 to 25 oz/ton Ag (Park, 1933). Limited amount of work on prospect by 1933. Smith (1938) reported prospecting in 1936 - vein opened by a few open cuts with apparently encouraging results. By 1951 the prospect could not be found (White, 1952).
Age: Late Cretaceous or younger; the veins cut Late Cretaceous Valdez Group rocks.
Alteration: Oxidation of Cu minerals.
Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins ? (Cox and Singer, 1986; model 36a ? ) or Chugach-t
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
9 valid minerals.
Detailed Mineral List:
ⓘ Arsenopyrite Formula: FeAsS |
ⓘ Calcite Formula: CaCO3 |
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Galena Formula: PbS |
ⓘ Galena var. Silver-bearing Galena Formula: PbS with Ag |
ⓘ Gold Formula: Au |
ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Quartz Formula: SiO2 |
ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Sphalerite | 2.CB.05a | ZnS |
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Galena | 2.CD.10 | PbS |
ⓘ | var. Silver-bearing Galena | 2.CD.10 | PbS with Ag |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Calcite | 5.AB.05 | CaCO3 |
ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Malachite | Cu2(CO3)(OH)2 |
C | Carbon | |
C | ⓘ Calcite | CaCO3 |
C | ⓘ Malachite | Cu2(CO3)(OH)2 |
O | Oxygen | |
O | ⓘ Calcite | CaCO3 |
O | ⓘ Malachite | Cu2(CO3)(OH)2 |
O | ⓘ Quartz | SiO2 |
Si | Silicon | |
Si | ⓘ Quartz | SiO2 |
S | Sulfur | |
S | ⓘ Arsenopyrite | FeAsS |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Galena | PbS |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Sphalerite | ZnS |
S | ⓘ Galena var. Silver-bearing Galena | PbS with Ag |
Ca | Calcium | |
Ca | ⓘ Calcite | CaCO3 |
Fe | Iron | |
Fe | ⓘ Arsenopyrite | FeAsS |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pyrite | FeS2 |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Zn | Zinc | |
Zn | ⓘ Sphalerite | ZnS |
As | Arsenic | |
As | ⓘ Arsenopyrite | FeAsS |
Ag | Silver | |
Ag | ⓘ Galena var. Silver-bearing Galena | PbS with Ag |
Au | Gold | |
Au | ⓘ Gold | Au |
Pb | Lead | |
Pb | ⓘ Galena | PbS |
Pb | ⓘ Galena var. Silver-bearing Galena | PbS with Ag |
Other Databases
Link to USGS - Alaska: | AN113 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Chugach DomainDomain
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