Nome Coastal Plain Mine, Nome Mining District, Nome Census Area, Alaska, USAi
Regional Level Types | |
---|---|
Nome Coastal Plain Mine | Mine |
Nome Mining District | Mining District |
Nome Census Area | Census Area |
Alaska | State |
USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
64° 32' 10'' North , 165° 27' 54'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Nome | 3,806 (2018) | 4.8km |
Mindat Locality ID:
199146
Long-form identifier:
mindat:1:2:199146:1
GUID (UUID V4):
488d4b23-2ade-411c-9984-7e6b7ff4a791
Location: The Nome Coastal Plain is the area between the Nome uplands and the present beach along Norton Sound, between Cape Rodney to the west, and Cape Nome. It has a maximum width of about 3.5 miles at Nome. The width of the coastal plain gradually decreases eastward for 12 miles to Cape Nome. It includes both alluvial and marine gold placers, but the marine placers are by far the most important. The map location is at the approximate center of the most important deposits. It is at the midpoint of the boundary of sections 15 and 16, T. 11 S., R. 34 W., Kateel River Meridian. These coastal plain deposits include localities 129, 135, 137, 138, 139, 141, 142, and 143 of Cobb (1972 [MF 463], 1978 [OFR 78-93]).
Geology: Pre-Pleistocene and Pleistocene marine and terrestrial sediments, especially near the major source areas of ancestral Snake River, Anvil Creek, and Nome River, contain small amounts of particulate gold. In the early days of the district, prospectors observed that they could obtain colors in sediments throughout the coastal plain (Brooks and others, 1901; Collier and others, 1908, plate X). Certain creeks cut only into the unconsolidated deposits. In those creeks, the gold disseminated in the terrestrial units and in marine sediments was locally concentrated into economic placer deposits by fluvial processes (Metcalfe and Tuck, 1942). Such creeks include Bourbon Creek (NM288), Lower Dry Creek (NM264), below Newton Gulch (NM266), Stevens Creek (NM274), Moss Creek (NM275), Laurada Creek (NM276), and Hastings Creek (NM298). All of these deposits are relatively young and were formed after marine transgression and deposition. Another class of coastal plain alluvial placer deposits formed before marine erosion. These deposits include the ancestral Anvil Creek (see Nome Placer Field, NM251), the Roxie placer and Newton Gulch (NM266). These streams cut headward into bedrock and flowed into the sea at the time Third Beach was formed. Subsequently, the channels were buried and preserved. Metcalfe and Tuck (1942, p. 26) also proposed that Evening Gulch, above the Sunset Creek (NM173) part of the Third Beach, is an old bedrock channel. Another type of buried placer deposit exists in lower parts of Snake and Nome Rivers and in Otter Creek. The lower 2 miles of Snake River has cut 50 feet below sea level and about 30 feet into bedrock. This part of the Snake River, as well as lower Nome River and lower Otter Creek, contain thick alluvial deposits. All of the shallow alluvial channels of the coastal plain, both in unconsolidated deposits and in schist bedrock, were discovered and mined in the early days of the Nome district. They had relatively minor production, although the ancestral Anvil Creek drainage was a main gold source for the marine deposits. The most important deposits of the coastal plain are the Present, Second, and Third beach strandline deposits; also present are Intermediate, Monroeville, and Submarine beach deposits. Submarine Beach is the oldest deposit certainly known (Metcalfe and Tuck, 1942, p. 47). Metcalf and Tuck believed that Submarine Beach was an eroded beachline that formed when sea level stood at about 40 feet and when the coastal plain was rolling hills traversed by an ancestral Anvil Creek. As envisaged by these authors, 'The sea advanced landward, and the Submarine area with its gold concentration was left behind on the abrasion platform. The sea continued to erode into bedrock gold-bearing sources which included the old Anvil Creek channel . . . and as it advanced, it carried a gold concentration on the beach before it. Likewise as the sea continued to advance, its abrasion platform was progressively being lowered so that any gold on its abrasion platform, such as the Submarine concentration, was gradually carried to a lower elevation.' Continued sea advances partially eroded and redistributed concentrations at the Intermediate and Monroeville so called beaches. At the same time, gold continued to be brought from the landward end of the system by ancestral Anvil, Newton, and Dry Creeks, and complex alluvial-marine deposits formed where these creeks entered the sea.
Workings: Exploration and production began with the discovery of Present Beach in 1899 and continued intermittently until 1998.
Age: Pliocene and Pleistocene.
Commodities (Major) - Au; (Minor) - Ag, W
Development Status: Yes
Deposit Model: Alluvial placer Au (Cox and Singer, 1986; model 39a); marine and complex placer
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
6 valid minerals.
Detailed Mineral List:
β Arsenopyrite Formula: FeAsS |
β 'Garnet Group' Formula: X3Z2(SiO4)3 |
β Gold Formula: Au |
β Ilmenite Formula: Fe2+TiO3 |
β Magnetite Formula: Fe2+Fe3+2O4 |
β Pyrite Formula: FeS2 |
β Scheelite Formula: Ca(WO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
β | Pyrite | 2.EB.05a | FeS2 |
β | Arsenopyrite | 2.EB.20 | FeAsS |
Group 4 - Oxides and Hydroxides | |||
β | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
β | Ilmenite | 4.CB.05 | Fe2+TiO3 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Scheelite | 7.GA.05 | Ca(WO4) |
Unclassified | |||
β | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | β Ilmenite | Fe2+TiO3 |
O | β Magnetite | Fe2+Fe23+O4 |
O | β Scheelite | Ca(WO4) |
O | β Garnet Group | X3Z2(SiO4)3 |
Si | Silicon | |
Si | β Garnet Group | X3Z2(SiO4)3 |
S | Sulfur | |
S | β Arsenopyrite | FeAsS |
S | β Pyrite | FeS2 |
Ca | Calcium | |
Ca | β Scheelite | Ca(WO4) |
Ti | Titanium | |
Ti | β Ilmenite | Fe2+TiO3 |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
Fe | β Ilmenite | Fe2+TiO3 |
Fe | β Magnetite | Fe2+Fe23+O4 |
Fe | β Pyrite | FeS2 |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
W | Tungsten | |
W | β Scheelite | Ca(WO4) |
Au | Gold | |
Au | β Gold | Au |
Other Databases
Link to USGS - Alaska: | NM254 |
---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Brooks-Seward DomainDomain
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.