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Rois Malk

Occurrence in Peleliu, Palau with commodities Gold, Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10086430
MRDS ID WA00001
Record type Site
Current site name Rois Malk

Geographic coordinates

Geographic coordinates: 134.59486, 7.382 (WGS84)
Elevation 104
Location accuracy 1000(meters)
Relative position Location Given Is Center Of Study Area Shown By Miller And Others (Usgs Bull 1872) On Plates 1,2, And 3 (1989)

Site location context

Political divisions (FIPS codes)

Peleliu(province)

Palau(country)

USGS map quadrangles

Babeldaob OE S(quadrangle 1:24,000 scale)

Geographic areas

Country State
Palau Peleliu

Comments on the location information

  • PALAU IS WESTERNMOST PART OF CAROLINE ISLANDS, 1500 KM SW OF GUAM. BABELTHAUP IS THE LARGEST OF PALAU'S 200 ISLANDS. ROIS MALK ARES IS IN SE PART OF BABELTHAUP. ROIS MALK AREA LIES ON A NW-TRENDING RIDGE WHICH CONTAINS THE PROMINENT HILL OF ROIS MALK WITH ELEVATION 104 M, THE HIGHEST POINT IN THE STUDY AREA.

Commodities

Commodity Importance
Gold Primary
Copper Secondary

Comments on the commodity information

  • THE SIZE OF THE MINERALIZED AREA, THE NUMBER AND EXTENT OF VEINS, AND THE CHEMISTRY OF THE MINERALIZED ZONES ARE COMPARABLE TO THOSE OF MANY DISTRICTS THAT HAVE HAD A SIGNIFICANT PRECIOUS-METAL PRODUCTION AND BY-PRODUCT BASE-METAL PRODUCTION (ABDUNDANCE OF CU IN THE VEIN SYSTEM).

Materials information

Materials Type of material
Chalcopyrite Ore
Electrum Ore
Gold Ore
Pyrite Ore

Analytical data

Result GOLD VALUES IN MINERALIZED VEINS: 0.005 - 13 PPM. ELEMENTS ASSOCIATED WITH GOLD INCLUDE: MO (5 - 100 PPM IN VEINS
Result INSUFFICIENT DATA FOR CALCULATION OF GEOMETRIC MEAN), TE (0.02 - 18.6 PPM IN VEINS
Result MEAN OF 3.19 PPM), BI (<1 - 25 PPM IN VEINS
Result MEAN 0.93 PPM), PB (<10 - 700 PPM IN VEINS
Result MEAN 24 PPM), AG (<0.5 -30 PPM IN VEINS
Result MEAN 0.67 PPM), CU (30 -5000 PPM IN VEINS
Result MEAN 411 PPM), ZN (<5 - 10000 PPM IN VEINS
Result MEAN 79.8 PPM), AND AS (10 - 300 PPM IN VEINS
Result MEAN 11.4 PPM).

Mineral occurrence model information

Model code 154
USGS model code 25e
Deposit model name Epithermal quartz-alunite Au
Mark3 model number 38

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Babelthuap Formation
    Rock description Babelthuap Formation
    Stratigraphic age (youngest) Eocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Airai Formation; Babelthuap Formation
    Rock description Airai Formation;Babelthuap Formation

Nearby scientific data

(1) 134.59486, 7.382
ListMap

Economic information

Ore body information

  • General form OTHER (>100 MINERALIZED VIENS AND SHEAR ZONES OVER AN AREA 1 X 1.5KM IN SIZE)
    Strike NE TO NW
    Dip STEEP
    Length 500M
    Width 5M

Controls for ore emplacement

  • Mineralized Veins, Shear Zones, And Brecciated Areas

Comments on the geologic information

  • BABELTHAUP FM. = BASALT AND BASALTIC ANDESITE FLOWS AND FLOW BRECCIAS; IN MOST AREAS NEAR ROIS MALK, IT IS INTENSLY WEATHERED TO LATERITE. AIRIA FM. IS ON WEST SIDE OF STUDY AREA, IN FAULT CONTACT WITH THE OLDER BABELTHAUP FM. AIRAI FM. = INTERBEDDED, WEAKLY CONSOLIDATED SHALES AND SHALY SILTSTONES AND PEBBLE CGL. AIRIA FM. IS POST-MINERALIZATION AGE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No
Discoverer This Area Was Previously Prospected By The Japanese, But In 1938-39 Was Considered To Be Of No Commercial Interest.

Comments on the reserve resource information

  • TONNAGES OF KNOWN ENARGITE-GOLD-TYPE DEPOSITS ELSEWHERE IN THE WORLD RANGE FROM 0.2 TO 11 MILLION METRIC TONS AND GOLD GRADES FROM 3 TO 18 PPM.

Comments on the workings information

  • SEVERAL TRENCHES WERE DUG WITH A BACKHOE (3M LIMIT) ACROSS ZONE ON MINERALIZATION TO BETTER DETERMINE THE NATURE OF THE VEIN SYSTEM DURING USGS FIELD STUDY. ALSO STUDIED WERE JAPANESE WW II TRENCHES (<2M DEEP) AND ROAD CUTS ALONG OLD ROAD ACROSS S. PART OF VEIN SYSTEM.

Comments on development

  • ECON.COM: DRILLING AND FURTHER TESTING ARE REQUIRED TO DETERMINE WHETHER SUFFICIENT GRADES AND VOLUME ARE PRESENT IN THE SUBSURFACE TO WARRANT ECONOMIC DEVELOPMENT.

Reference information

Bibliographic references

  • Deposit

    MILLER, W.R., RYTUBA, J.J., ARNOLD, M.A., AND VERCOUTERE, T.L., 1989, INVESTIGATION OF THE ROIS MALK EPITHERMAL GOLD SYSTEM, REPUBLIC OF PALAU: U.S. GEOLOGICAL SURVEY BULLETIN 1872, 85P. PLUS 3 PLATES.

  • Deposit

    RYTUBA, J.J., MILLER, W.R., AND STEWART, J.H., 1985, ROIS MALK EPITHERMAL GOLD SYSTEM, REPUBLIC OF PALAU: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 85-606, 6P.

  • Deposit

    RYTUBA, J.J., MILLER, W.R., AND MCKEE E.H., 1987, EPITHERMAL GOLD MINERALIZATION IN THE REPUBLIC OF PALAU: IN U.S. GEOLOGICAL SURVEY CIRCULAR 995 (MCKELVEY FORUM ABSTRACTS, 1987), P. 59-60.

  • Deposit

    USGS BULLETIN 1872 (1989

  • Reserve-Resource

    USGS BULLETIN 1872 (1989)

General comments

Subject category Comment text
Deposit VEINS AND MINERALIZED SHEAR ZONES CONTAINING HIGH GOLD (0.7-5.8 PPM) STRIKE N. 20 E TO N 10 W., AND N 30 TO 35 W. HIGHEST GOLD CONTENT IS IN VEINS AND SHEAR ZONES OF N 10 W AND N 30 W.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-90 Jenness, Jane E. U.S. Geological Survey

Beyond USGS

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

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