Unnamed (near headwaters of Dillon Creek)

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Lead

Geologic information

Identification information

Deposit ID 10001939
MRDS ID A012773
Record type Site
Current site name Unnamed (near headwaters of Dillon Creek)

Geographic coordinates

Geographic coordinates: -163.82027, 65.20739 (WGS84)
Relative position This prospect is on the divide between Dillon Creek, a west headwater tributary of Pargon River, and an unnamed east headwater tributary of Niukluk River. It is about 1,000 feet south of the saddle between these two drainages at an elevation is 2.035 feet. It is locality 81 of Gamble (1988).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Chrysocolla Ore
Galena Ore
Malachite Ore
Limonite Gangue
Quartz Gangue

Alteration

  • (Local) Oxidation of vein sulfides has occurred.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Pegmatite

Nearby scientific data

(1) -163.82027, 65.20739

Comments on the geologic information

  • Geologic Description = Chalcopyrite, galena, pyrite (?), and duftite (?) are intergrown with drusy comb-quartz in fissure veins along a 30 foot-wide fault zone in high grade metamorphic rocks here (Briskey, 1983). The vein is oxidized and secondary minerals include limonite, malachite, and chrysocolla. A grab sample contained 0.5 ppm Au, 8 % As, 6,000 ppm Zn, 680 ppm Sb, 300 ppm Ag, 1.5 % Cu, greater than 2 % Pb, and 30 ppm Mo (Gamble, 1988). This occurrence, and several others in this part of the Bendeleben A-4 quadrangle, are in high grade metamorphic rocks that are structurally above or peripheral to the crosscutting Pargon pluton. The Pargon pluton is mostly granodiorite and assumed to be Cretaceous in age (Till and others, 1986). It was emplaced at shallower depths than the more deep-seated Bendeleben pluton to the east. The metamorphic rocks peripheral to the western Pargon pluton are also intruded by small, felsic dikes and plugs including quartz porphyry and muscovite granite.
  • Age = Cretaceous; this occurrence is probably related to emplacement of the Pargon pluton which is assumed to be Cretaceous in age.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Council

Comments on the workings information

  • Workings / Exploration = A shallow, 16 foot-long prospect trench trending N 55 W has been dug here.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012773
USGS Alaska Resource Data File ARDF BN128

Bibliographic references

  • Deposit

    Briskey, J.A., 1983, Summary of field observations on Seward Peninsula mineral deposits: U.S. Geological Survey, unpublished administrative report, 34 p.

  • Deposit

    Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.

  • Deposit

    Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Gamble, 1988

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein in high grade metamorphic rocks (Cox and Singer, 1986; model 22c ?)

Reporter information

Type Date Name Affiliation Comment
Reporter 15-MAR-1999 Travis L. Hudson Applied Geology