Neirod - East

The Neirod - East is a gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Neirod - East

Commodity

Primary: Gold
Secondary: Mercury
Secondary: Zinc
Secondary: Antimony
Secondary: Arsenic
Secondary: Lead
Secondary: Copper

Location

State: Alaska
District: Innoko

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Porphyry Cu-Au

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Extensive sericitization of plutonic rocks; late tourmaline metasomatism.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Zinkenite
Ore: Pyrite
Ore: Jamesonite
Ore: Boulangerite
Ore: Arsenopyrite
Gangue: Quartz
Gangue: Tourmaline

Comments

Comment (Workings): Workings / Exploration = Five chip channel samples collected along about 1,640 feet (500 m) strike of the zone contained up to 760 ppb gold, 1.00 percent arsenic, 5,360 ppb mercury, and 178 ppm copper (Bundtzen and others, 1997).

Comment (Exploration): Status = Active

Comment (Deposit): Model Name = Porphyry Cu-Au (Cox and Singer, 1986; model no. 20c)

Comment (Commodity): Gangue = Ferricrete breccia

Comment (Geology): Age = Late Cretaceous (inferred) based on 71.0 Ma age of adjacent pluton (Bundtzen and others, 1997).

Comment (Reference): Primary Reference = Bundtzen and others, 1997

Comment (Deposit): Other Comments = See Montana Saddle prospect (MD018).

Comment (Geology): Geologic Description = An extensive altered zone in border phase plutonic rocks and hornfels extends in a north-south direction for a distance of about 1,968 feet (600 m). The mineralization consists of : (1) ferricrete breccia in the border phase of the Cripple Creek Mountains pluton; (2) stockwork veins in hornfels; and (3) quartz stockwork in fine grained monzonite. The Neirod-East prospect falls within a north 40 degrees east alignment of several metallic lodes--including the Moose Jaw (MD019), Montana Saddle (MD018), and Wyoming Lode (MD016) prospects. Age of mineralization is inferred to be Late Cretaceous based on 71.0 Ma age of adjacent pluton (Bundtzen and others, 1997). . Microprobe analyses of mineralization from the Neirod-East prospect indicates the presence of boulangerite, jamesonite, and zinkenite in addition to the megascopic arsenopyrite observed in hand specimens. Gold is intimately intergrown with jamesonite - an uncommon association (Bart Cannon, written communication, 1998). Five chip channel samples collected along about 1,640 feet (500 m) strike of the zone contained up to 760 ppb gold, 1.00 percent arsenic, 5,360 ppb mercury, and 178 ppm copper (Bundtzen and others, 1997).

References

Reference (Deposit): Bundtzen, T.K., Pinney, D.S., and Laird, G.M., 1997, Preliminary geologic map and descriptive data tables from the Ophir C-1 and western Medfra C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 97-46, 10 p., 1 sheet, scale 1:63,360.

Reference (Deposit): Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.

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