1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Royal Dutch

Occurrence in Alaska, United States with commodity Gold
Map
XML
JSON
KML
C
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10003264
MRDS ID A106007
Record type Site
Current site name Royal Dutch

Geographic coordinates

Geographic coordinates: -166.42517, 53.87911 (WGS84)
Relative position Near head of westernmost stream draining into Humpy Cove of Summer Bay, approximately 2.8 km inland.

Site location context

Political divisions (FIPS codes)

Aleutians West(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Unalaska C-2(quadrangle 1:63,360 scale)

Unalaska NE(quadrangle 1:100,000 scale)

Unalaska SE(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Fox Islands(hydrologic unit)

Aleutian Islands(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Alaska Maritime National Wildlife Refuge(National Wildlife Refuge)

National Wildlife Refuge FWS(Type of land area)

FWS(Federal land areas administered by FWS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) Regional propylitic alteration; increased(?) wall-rock propylitic alteration in association with veining.

Mineral occurrence model information

Model code 105
USGS model code 25a-d
Deposit model name Epithermal vein, generic
Mark3 model number 119

Nearby scientific data

(1) -166.42517, 53.87911
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Randolph (1991) reports this occurrence is very similar to Misty Mountain (UN012). "The prospect appears to be located within a transition zone between 2 regional rock packages. The lower package includes andesitic flows and tuffs and the upper package is a thick sequence of basaltic flows and lahars. *** Unlike Misty Mtn., both rock packages *** exhibit propylitic alteration, quartz veining, and intrusion by dioritic to gabbroic plutons (Randolph, 1991)." A wide-spaced cockscomb quartz/arsenopyrite vein system covers an area approximately 600 by 1,000 feet (180 x 300 m) and the veins have a dominant trend of N30x W. Veins approach 2 feet (0.7m) in thickness and vary in density from one vein to tens-of-feet to many veins per foot. In areas of high density veining the country rock is strongly propylitized and contains abundant epidote. Mineralization is restricted to the quartz veins.
  • Age = Late Tertiary or younger

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Aleutians

Comments on the workings information

  • Workings / Exploration = Pan concentrate, rock, and soil sampling by BMEC (Randolph, 1991). Rock (vein) samples had gold values to 6.58 oz/t (225 ppm) gold, 0.1 oz/t (3.4 ppm) silver, and 6,167 ppm arsenic. Only two rock samples on NW margin of grid had anomalous mercury, but pan concentrates had high mercury. Twenty of 29 rock samples had gold greater than 130 ppb. Nineteen of those 20 contain more than 52 ppm As. Of the 8 rocks containing more than 400 ppm AS, 5 contained more than 1 ppm Au, suggesting a strong correlation between As and Au.

Reference information

Bibliographic references

  • Deposit

    Randolph, D.B., 1991, Unalaska project, 1990 final report: Battle Mountain Exploration Company, Alaska District, 62 p., 5 appendices, 15 plates, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Comments on the references

  • Primary Reference = Randolph, 1991

General comments

Subject category Comment text
Deposit Model Name = Epithermal gold vein

Reporter information

Type Date Name Affiliation Comment
Reporter 07-MAY-1996 F.H. Wilson U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.