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Lerokis Project

Prospect in Maluku, Indonesia with commodities Barium-Barite, Silver, Gold
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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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Ownership information
  15. Reserves and resources
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10055805
MRDS ID SP00002
Record type Site
Current site name Lerokis Project
Related records 10280752

Geographic coordinates

Geographic coordinates: 126.29476, -7.71575 (WGS84)
Location accuracy 1000(meters)
Relative position 170 KM NORTHEAST OF DILI, EAST TIMOR., Latitude Is Only Approximate

Site location context

Political divisions (FIPS codes)

Maluku(province)

Indonesia(country)

Asia(continent)

Land(continent)

Geographic areas

Country State
Indonesia Maluku

Comments on the location information

  • LOCATED ON ISLAND OF WETAR, NEAR UPPER REACHES OF WETUK RIVER; NEAR VILLAGE OF LURANG.; PREVIOUS QUAD DESIGNATION = QUAD NO. 2508 1:250000

Commodities

Commodity Importance
Barium-Barite Critical Primary
Silver Primary
Gold Primary

Materials information

Materials Type of material
Barite Ore
Gold Ore
Clay Gangue
Hematite Gangue
Limonite Gangue
Quartz Gangue

Alteration

  • (Local) Volcanics Are Laterized; Laterization Superimposed On Silica - Clay Alteration. Variable Quartz Stockwork 25% To 30% Or More.

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic)
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic)

Nearby scientific data

(1) 126.29476, -7.71575
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Wetar Island Consists Of A Number Of Large, Partly Eroded Stratovolcanoes
Type of structure Local
Structure description Nnw Trending Faults

Ore body information

  • Name CLUSTER OF 5 ZONES
    General form LENS, BLANKET
    Length 1300M
    Width 600M

Comments on the ore body information

  • Orebody depth to bottom is shallow
  • Orebody is in an outcrop

Controls for ore emplacement

  • Associated With Silica - Clay Alteration; Quartz Stockworks Up To 30%

Comments on the geologic information

  • VERY LITTLE GEOLOGIC INFORMATION AVAILABLE. GOLD AND SILVER GENERALLY ASSOCIATED WITH BARITE WHICH IS CEMENTED IN LATERIZED VOLCANICS BY VARIABLE PROPORTIONS OF QUARTZ, LIMONITE, HEMATITE, AND CLAY.

Economic information about the deposit and operations

Development status Prospect
Commodity type Both
Deposit size Small
Significant No

Ownership information

  • Type Joint Venture Partner
    Owner Weta Minerals Pte Ltd.
    Interest 90
  • Type Joint Venture Partner
    Owner P. T. Prima Maluku Indah
    Interest 10
  • Type Operator
    Owner Pt. Prima Lirang Mining

Reserves and resources

  • Type In-situ
    Estimate year 1989
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 103.489 g/mt Silver Major 1989
    Gold Au 3.177 g/mt Gold Major 1989

Comments on the reserve resource information

  • MEASURED - 1 NORTH - 1.10 MT, 3.51 G/T AU, 100.9 G/T AG, 31.2 %BA; 1 CENTRAL - 0.33 MT, 6.27 G/T AU, 144.3 G/T AG, 39.2 %BA; 1 SOUTH - 0.14 MT, 1.94 G/T AU, 125.4 G/T AG, 52.7 %BA; 5 - 0.48 MT, 2.51 G/T AU, 135.5 G/T AG, 58.4 %BA; TOTAL MEASURED - 2.05 MT, 3.61 G/T AU, 122.9 G/T AG, 40.3 %BA; INDICATED - 2 - 0.26 MT, 2.4 G/T AU, 83.4 G/T AG, 42.1 %BA; 3 - 0.08 MT, 3.0 G/T AU, 94.7 G/T AG, 52.1 %BA; 4 - 0.44 MT, 4.27 G/T AU, 107.0 G/T AG; TOTAL INDICATED - 0.78 MT, 3.5 G/T AU, 97.0 G/T AG; TOTAL RESOURCE - 2.83 MT, 3.6 G/T AU,116.0 G/T AG. RESOURCE ESTIMATES WERE CALCULATED USING A 1 G/T RECOVERABLE GOLD EQUIVALENT CUT OFF.
  • MINING RESERVES ---------------------------------------------------------------------------------- CATEGORY ZONE RESERVE MT ORE G/T AU AG G/T % BARITE DILUTION % --------------------------------------------------------------------------------------------------- PROVEN 1 NORTH 1.188 3.3 104 40 9.5 1 CENTRAL 0.354 5.8 130 40 8.4 5 0.515 2.3 125 40 10.2 TOTAL 2.057 3.5 114 40 9.5 ---------------------------------------------------------------------- PROBABLE 2 0.280 2.2 78 40 12.4 3 0.088 2.8 89
  • 40 10.9 4 0.484 3.6 91 ND, 0 USED 10 EST TOTAL 0.852 3.1 86 17 12.0 --------------------------------------------------------------------------- TOTAL PROVEN AND PROBABLE 2.909 3.3 106 33 9.8

Comments on development

  • PRIOR TO 1989 WETA MINERALS LISTED AS SUBSIDIARY OF CRS, LTD., AUSTRALIA.

Reference information

Bibliographic references

  • Deposit

    PT. PRIMA LIRANG MINING, CONTRACT OF WORK, FIRST RELINQUISHMENT REPORT, MALUKU TENGGARA, INDONESIA, R. P. LINDSAY, DECEMBER 1987.

  • Deposit

    LEROKIS PROJECT, FEASIBILITY STUDY, EXECUTIVE SUMMARY, PT. PRIMA LIRANG MINING, JAKARTA, JULY 1989.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-90 Zientek, Michael L. U.S. Geological Survey

Beyond USGS

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

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