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Oita Group

Past Producer in Oita, Japan with commodity Mercury
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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. Mining district
  15. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10040012
MRDS ID M053014
Record type Site
Current site name Oita Group

Geographic coordinates

Geographic coordinates: 131.83225, 32.9321 (WGS84)
Relative position 4.5 APPROX. 3.5 KM FROM KAMIOKA STATION, NIPPO RR LINE

Site location context

Political divisions (FIPS codes)

Oita(province)

Japan(country)

Asia(continent)

Land(continent)

Geographic areas

Country State
Japan Oita
Japan Oita

Commodities

Commodity Importance
Mercury Secondary

Materials information

Materials Type of material
Cinnabar Ore
Calcite Gangue
Chalcedony Gangue
Opal Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Brecciation, Pyrite Dissemination

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Stratigraphic age (youngest) Early Triassic
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone

Nearby scientific data

(1) 131.83225, 32.9321
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Faults Which Parallel Bedding Planes

Ore body information

  • Strike N 75 DEG E APPROX. E
    Dip 30 - 35 DEG N
    Thickness 1M
    Length 215M
    Width 55M

Controls for ore emplacement

  • Fault Planes, Crush Zones, Bedding Planes

Comments on the geologic information

  • GEOL.DESC: 5 DEPOSITS-MOST DEVELOP IN ABOVE 3 SITUATIONS, SOME DISSEMINATION OF CINNABAR

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No
Production years 1938 - 1945

Mining district

District name Saeki Mine

Production statistics

  • Year 1944
    Material HG
    Accuracy Accurate
    Description Ap_Grade: ^Hg = 0.040 %
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Mercury Mercury 0wt-pct
  • Year 1945
    Period 1945
    Material HG
    Accuracy Accurate
    Description Cp_Grade: ^Hg = 0.056 %
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Mercury Mercury 0wt-pct

Comments on the production information

  • DATA BEFORE 1938 IS UNAVAILABLE. DATA FIGURES INCLUDE PRODUCTION FROM ALL WORKINGS OF THE SAEKI MINE, OF WHICH AT LEAST 40 % HAS BEEN FROM DEPOSIT NO. 13 OF THE OITA GROUP

Reserves and resources

  • Type In-situ
    Estimate year 1947
    Total resources 3458000mt ore
    Commodity Subtype Grade units Group Importance Year
    Mercury Hg 0.47 wt-pct Mercury Minor 1947

Comments on the reserve resource information

  • THIS INCLUDES PROVED RESERVES OF DEPOSITS NOS 13 , 17 .

Workings at the site

  • Type of workings Underground
    Overall depth 50M

Comments on the workings information

  • THIS DATA IS FOR DEPOSIT NO. 13

Reference information

Bibliographic references

  • Deposit

    HORI, S., 1953 , "MERCURY DEPOSITS OF JAPAN", GEOL SUR JAP REPORT NO 154 , P. 114

  • Deposit

    KINOSHITA, K., 1942 , "MERCURY DEPOSITS OF KYUSHU", JAP ASS MIN PET ECO GEOL B. VOL 25 NO. 1 P. 29 - 35

  • Deposit

    KINOSHITA, K., 1942 , "MERCURY DEPOSITS OF KYUSHU", JAP ASS MIN PET ECO GEOL B. VOL 25 NO. 2 P. 66 - 77

  • Deposit

    GEN. HEADQU. SUP. ALL COMMAND, NAT RES. DIV., 1947 , "MERCURY RESOURCES OF JAPAN" REPORT NO. 91

  • Production

    GEN HEADQU. SUP COM ALLIES NAT RES DIV, 1947 , REP 91

  • Reserve-Resource

    GEN HEADQU. SUP COMM ALL FOR, NAT RES DIV, 1947 , REP. NO. 91

General comments

Subject category Comment text
Deposit * DATA OF DIMENSIONS ORIENTATION IS OF DEPOSIT NO. 13 .

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1978 Roddy, Stephen J. U.S. Geological Survey

Beyond USGS

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

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