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Narralapu-Lapu

Past Producer in Philippines with commodity Chromium
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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. Nearby scientific data
  8. Ore body information
  9. Economic information about the deposit and operations
  10. Mining district
  11. Mineral rights holdings
  12. Land status
  13. Ownership information
  14. Production statistics
  15. Reserves and resources
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. Reporter information

Geologic information

Identification information

Deposit ID 10206783
MAS/MILS ID 5650270019
Record type Site
Current site name Narralapu-Lapu
Alternate or previous names Narra, Trident Mini8ng

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: 118.31607, 9.30897 (WGS84)
Elevation 200
Location accuracy 1000(meters)

Site location context

Political divisions (FIPS codes)

Philippines(country)

Asia(continent)

Land(continent)

Geographic areas

Country
Philippines

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Antigorite Unknown
Chromite Unknown
Chrysolite Unknown
Olivine Unknown

Nearby scientific data

Ore Body (1) 118.31607, 9.30897
ListMap

Economic information

Ore body information

  • Strike N45W
    Dip 70S
    Thickness 6M
    Length 125M
    Width 5M
    Depth to top 20M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 OTHER
    Shape of Orebody #1 TABULAR
    Shape of Orebody #2 LENTICULAR
    Shape of Orebody #3 IRREGULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 UNKNOWN
    Strike And Dip N45W:70S
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 2
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830712
  • Area 20000HA
    Field Value
    Total Surface Area (HA) 20000
    Date of Last Modification 910418

Comments on the geologic information

  • MANY OREBODIES OCCUR OVER A 3KM NW-SW WIDTH. THIS AREA IS SPLIT INTO AT LEAST 6 INDIVIDUAL MINE/DEPOSIT AREAS. IT IS IMPOSSIBLE TO CHARACTERIZE ALL THE VARIETY OF DIMENSIONS OF THE NUMEROUS ORE BODIES INTO THE DATA BASE. THE DIMENSIONS CODED IN THE G-RECORD REPRESENT A ROUGH AVERAGE SIZE FOR AN INDIVIDUAL ORE BODY IN THE AREA. THERE ARE BASICALLY THREE TYPES OF ORE PRESENT IN THE VARIOUS AREAS: MASSIVE, FRIABLE ORE, NODULAR-TYPE ORE, AND BRECCIATED- DISSEMINATED TYPE ORE. ALL THREE TYPES ARE INCLUDED IN THE Q-MATRIX 1 TONNAGE ESTIMATE.

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Significant Yes
Discovery year 1977
Mining method Open Pit
Year of first production 1978
Milling method Gravity

Mining district

District name Palawan Island

Mineral rights holdings

Type of mineral rights Unknown

Land status

Ownership category Unknown

Ownership information

  • Type Operator
    Owner Trident Mining And Industrial Corp.
    Home office Philippines
    Year 1981
  • Type Owner
    Owner Grand Tierra Exploration Corp.
    Home office Philippines
    Year 1981
  • Type Owner
    Owner Columbian Exploration Corp.
    Home office Philippines
    Year 1981
  • Type Owner
    Owner Bethlehem Exploration Corp.
    Home office Philippines
    Year 1981
  • Type Owner
    Owner Dominion Exploration Corp.
    Year 1981

Production statistics

  • Year 1979
    Description 24061 Mt Ore/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Chromium Chromium 24061mt

Comments on the production information

  • PA REPRESENTS WEIGHT AVERAGE OF WHAT IS IN ACTUALITY 4 DIFFERENT PRODUCTS: (1) LUMP ORE-41% , (2) COARSE FINES -17% , (3) FINES CONC.-38% , AND (4) ROM FINES-3.5% GRADE RANGES OF PRODUCTS IS 43.8 - 47.7% CR2O3.

Reserves and resources

  • Type In-situ
    Estimate year 1987
    Demonstrated 2504000mt ore
    Total resources 2504000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 28 wt-pct Chromium Major 1987

Comments on the reserve resource information

  • THE RESOURCE TONNAGE IN Q-MATRIX 1 REPRESENTS AN ESTIMATE OF THE TONNAGE AVAILABLE IN THE ENTIRE LEASE AREA, AND IS REFFERED TO AS "GEOLOGIC RESERVE" AS OF 1980. HOWEVER, FROM RESULTS OF ONLY THREE OR FOUR YEARS OF EXPLORATION, IT IS FELT THAT THIS LEVEL OF TONNAGE SHOULD FIT INTO A DEMONSTRATED RESOURCE CATEGORY. EXACT IN SITU RESERVES: 4,130,219 MT M1C1=M9C4
  • SITE VISIT JUNE,1987. TRIDENT MINING SUPPOSEDLY SPENT $30,000,000 ON BRINGING PROPERTY INTO PRODUCTION IN 1978 BUT ONLY 140,000 MT OF CHROMITE PROD- UCTION FROM 1978 THRU 1981 WHEN CO. WENT BANKRUPT. FOR ANALYSIS: 150,000 MTPY ROM FOR PRODUCTION OF 22,160 MTPY OF LUMP PRODUCTS AT 40 % CR2O3 AND 43,600 MTPY OF CONCS.AT 48 % CR2O3. ALL PRODUCTS ANALYZED AS CHROMITE MET PRODS.FOB PORT.

Workings at the site

  • Type of workings Surface
    Area 20000HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OPEN PIT
    Percent Waste Rock 75
    Avg. Overburden Thickness 5
    Primary Material Cover SAND, SILT
    Percentage 100
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 5
    Max. Pit Slope (degrees) 70
    Capacity 220
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 0
    Units of Production $/MT ORE
    Operating Days per Year 300
    Operating Shifts per Day 2
    Year of Information 1981

Comments on other economic factors

  • TRANSPORTATION COST, MILL TO SMELTER IS $22.16/ MT MILL OUTPUT.

Reference information

Bibliographic references

  • Deposit

    ANON. 1980. "AN UPTURN IN THE INTERNATIONAL CHROMITE MARKET"

  • Deposit

    ENGINEERING AND MINING JOURNAL. SEPTEMBER. P.317.

  • Deposit

    ANON. 1980. "DIRECTORY OF PHILIPPINE PRODUCING MINES AND

  • Deposit

    QUARRIES," BUREAU OF MINES AND GEO-SCIENCES, MANILA.

  • Deposit

    JULY. P. 11.

  • Deposit

    ANON. 1980. "MINES MIDYEAR REVIEW." BUREAU OF MINES AND GEO-

  • Deposit

    SCIENCES, MANILA. P. 4.

  • Deposit

    BACUTA, G.C. 1978. "GEOLOGY OF SOME ALPINE-TYPE CHROMITE

  • Deposit

    DEPOSITS IN THE PHILIPPINES." BUREAU OF MINES, MANILA.

  • Deposit

    PP. 16-17.

  • Deposit

    FERNANDEZ, H.E. 1967. "CHROMITE DEPOSITS OF CENTRAL PALAWAN"

  • Deposit

    2ND GEOLOGICAL CONVENTION AND 1ST SYMPOSIUM OF THE

  • Deposit

    GEOLOGICAL MINERAL RESOURCES OF THE PHILIPPINES AND

  • Deposit

    NEIGHBORING COUNTRIES, JANUARY 11-14, VOLUME 1.

  • Deposit

    PP. 77-78, 80-82.

  • Deposit

    PALENCIA, C.M. "MINERAL RESOURCES OF THE PHILIPPINES," U.S.

  • Deposit

    BUREAU OF MINES. P. 19.

  • Deposit

    PERSONAL COMMUNICATION.

  • Deposit

    BACANI, MANUEL M. AND TARONGOY, HENRY C., "MINING METHODS OF

  • Deposit

    PHILIPPINE CHROMITE DEPOSITS." 1979.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-SEP-1992 Boyle, Ed U.S. Bureau of Mines

Beyond USGS

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

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