Ear Mountain Deposit

The Ear Mountain Deposit is a tin 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

Name: Ear Mountain Deposit

State: Alaska

County: na

Elevation:

Commodity: Tin

Lat, Long: 65.94361, -166.20556

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Satelite image of the Ear Mountain Deposit

Ear Mountain Deposit MRDS details

Site Name

Primary: Ear Mountain Deposit
Secondary: Winfield Shaft
Secondary: Patented Claims: Surprise, Chloride Fraction, Granite

Commodity

Primary: Tin
Secondary: Copper
Secondary: Uranium
Secondary: Zinc
Secondary: Lead
Tertiary: Antimony
Tertiary: Gold
Tertiary: Silver
Tertiary: Tungsten

Location

State: Alaska
District: Port Clarence-Serpentine

Land Status

Land ownership: State
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1904
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Calc-Silicate Alteration: Early Pyroxene-Plag.-Scapolite Hornfels, Later Stage Fine Grained Skarn With Subequal Pyroxene-Idocrase-Garnet, Cross-Cut By Coarse-Grained Tourmaline-Garnet-Quartz-Sulfide Adjacent To Tourmaline And Fluorite-Bearing Granite.

Rocks

Not available

Analytical Data

Analytical Data: U-BEARING DIKE CONTAINS UP TO 0.182% EU, AVG. GRADE OF 0.014% EU, USGS BULLETIN 1024-C, P. 89.
Analytical Data: ZONE 1000 FT BY 65 FT ON NE SIDE OF MT. AVERAGES 0.2% SN, TR WO3, 0.28% CU, 0.06% PB, 0.27% ZN, TR AU AND 0.15 OZ/TON AG, USBM RI 5493, TABLE 29, P. 47

Materials

Ore: Galena
Ore: Cassiterite
Ore: Stibnite
Ore: Sphalerite
Ore: Malachite
Ore: Chalcopyrite
Ore: Cinnabar
Ore: Scheelite
Ore: Stannite
Ore: Chalcocite

Comments

Comment (Deposit): CASSITERITE, STANNITE, PAIGEITE, CHALCOPYRITE AND OTHER BASE-METAL SULFIDES IN SKARNS AND SPARSE CASSITERITE-QUARTZ VEINS IN LIMESTONE ALONG CONTACT WITH MULTIPHASE BIOTITE GRANITE STOCK; HIGHLY VARIABLE CONTACT METAMORPHIC SILICATE AND SULFIDE ASSEMBLAGE; TOURMALINE-QUARTZ GREISEN VEINS IN UPPER LEVELS OF PLUTON; U OCCURS IN OXIDIZED TOURMALINIZED MAFIC DIKE AND ADJACENT BIOTITE GRANITE; BE-GEOCHEM. ANOMALY SURROUNDS STOCK.

Comment (Workings): NUMEROUS TRENCHES, SEVERAL SHALLOW SHAFTS AND DRIFTS; WINFIELD SHAFT; 29 FT DEEP WITH DRIFTS ON 29-FT LEVEL AND 35 FT WINZE INCLINED 34 DEGREES.

Comment (Commodity): SEE PERTINENT MINERALS FIELD FOR LIST OF MINERALS IDENTIFIED AT EAR MT.

Comment (Geology): COUNTRY ROCK CUT BY DIKES AND SILLS OF ALASKITE AND F. GRAINED GRANITE PORPHYRY; AT LEAST ONE MAFIC DIKE; ACCESSORY MONAZITE AND ZIRCON IN GRANITE; ACCESSORY TOPAZ-MUSCOVITE-CASSITERITE IN APOPHYSES; BORDER FACIES TOURMALINIZED, ACCESSORY CHALCOPYRITE. EAR MOUNTAIN STOCK; PORPHYRITIC TO EQUIGRANULAR BIOTITE GRANITE.

Comment (Location): WINFIELD SHAFT, USBM RI 5493, FIG. 4 AND FIG. 10. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Comment (Development): WINFIELD SHAFT SUNK: 1913-1914; USBM TRENCHING: 1953-54.