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Hemerdon Mine

Past Producer in Devon, United Kingdom with commodities Tungsten, Tin
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Host and associated rocks
  7. Nearby scientific data
  8. Geologic structures
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Ownership information
  13. Production statistics
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10021609
MRDS ID DE00286
Record type Site
Current site name Hemerdon Mine

Geographic coordinates

Geographic coordinates: -4.00332, 50.40737 (WGS84)
Relative position PROPOSED OPEN PIT; 100 M

Site location context

Political divisions (FIPS codes)

Devon(province)

United Kingdom(country)

Europe(continent)

Land(continent)

Geographic areas

Country State
United Kingdom Devon

Commodities

Commodity Importance
Tungsten Critical Primary
Tin Critical Primary

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Hemerdon Granite;Killas
    Rock description Hemerdon Granite;Killas

Nearby scientific data

(1) -4.00332, 50.40737
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Economic information

Geologic structures

Type of structure Regional
Structure description Granite Emplaced In Orogenic Belt

Ore body information

  • Depth to top 0M

Comments on the geologic information

  • PRINCIPAL MINERAL ASSEMBLAGES: WLFM + CSTR + QRTZ + KOLN + MICA IN GRANITE. GRANITE IS STRONGLY KAOLINIZED, RESULTING SLIMES CAUSE PROBLEMS IN BENEFICATION.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1916
Year of first production 1917
Year of last production 1944

Mining district

District name South West England

Ownership information

  • Type Owner
    Owner Amax Inc.
    Home office P.O. Box 1700, Greenwich, Conn., 06836
  • Type Owner
    Owner Billiton
    Home office P.O. Box 436, 2260 Ak Leidschendam

Production statistics

  • Year 1919
    Period 1917-1919
    Material ORE W
    Accuracy Accurate
    Description Cp_Grade: ^1.0% W + 0.25% Sn
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Tin Tin 0wt-pct
    Major Ore Tungsten Tungsten 1wt-pct
  • Year 1944
    Period 1943-1944
    Material ORE W
    Accuracy Accurate
    Description Cp_Grade: ^1.0% W + 0.25% Sn
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Tungsten Tungsten 1wt-pct
    Major Ore Tin Tin 0wt-pct

Comments on the production information

  • PRODUCTION CAPACITY: NO CAPACITY ON SITE AT PRESENT. CUM. PROD. ITEM 1: ACTUAL MILL RECOVERY WAS 45.5% OF TOTAL WOLFRAM AND CASSITERITE IN THE ORE (1.17%). WOLFRAM CONCENTRATE PRODUCED REPORTED TO GRADE 60.03% WO3 (TERRELL, 1920, P. 79, 84)

Workings at the site

  • Type of workings Surface
    Area 38HA

Comments on development

  • NON-GEOLOGIC CONSTRAINTS ON DEVELOPMENT OR EXPANSION IN 1-5 YRS.: GOVERNMENT REGULATIONS AND LOW METAL PRICE. NO ACTIVE DEVELOPMENT IN MINE. ACTIVE EXPLORATION IN DISTRICT: YES. SOME PROSPECTING IN DEVON AND CORNWALL IN GENERAL BUT NONE AT THE HEMERDON SITE AT PRESENT. ASSESSMENT: MINE WILL PROBABLY COME INTO OPERATION IN 5-10 YEARS TIME PROVIDED THERE IS AN ADEQUATE METAL PRICE. NO OBVIOUS CONSTRAINTS ON EXPANSION EXCEPT ENVIRONMENTAL REGULATIONS AND THE SIZE OF THE DEPOSIT.

Reference information

Comments on the other database information

  • RECORD NUMBER MMMMMMM IS A POTENTIAL DUPLICATE OF THIS RECORD

Bibliographic references

  • Deposit

    HEMERDON MINE - PLANNING APPLICATION FOR THE DEVELOPMENT OF A TUNGSTEN AND TIN MINING OPERATION, VOL. 1: SUPPORT STATEMENT 16TH OCT. 1984.

  • Deposit

    DINES, H.G., 1956, THE METALLIFEROUS MINING REGION OF SOUTH-WEST ENGLAND, MEMOIRS OF THE GEOLOGICAL SURVEY OF GREAT BRITAIN, 2 VOLS., LONDON, H.M.S.O., 705 P., (ESPECIALLY PAGES 15, 53, AND 685-689).

  • Deposit

    TERRELL, E., 1920, THE HEMERDON WOLFRAM-TIN MINE, THE MINING MAGAZINE, VOL. 22, FEB., 1920, P. 75-87.

  • Production

    PLANNING APPLICATION - SUPPORT STATEMENT

General comments

Subject category Comment text
Deposit PRODUCT UPGRADED BEFORE EXPORT: REFINED

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1984 Harris, Peter M. British Geological Survey

Beyond USGS

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

Operator history (post-MRDS)

MRDS records operators as of each record's last update (≤ 2019). Some of the operators listed here have since changed hands or dissolved:

  • Amax Inc. — now part of Subsidiary of Freeport-McMoRan (2007)
    Merged with Cyprus Minerals to form Cyprus Amax in 1993; Cyprus Amax → Phelps Dodge (1999) → Freeport-McMoRan (2007).

Curated by qvyshift.com from publicly-reported M&A activity (SEC filings, press releases, USGS Mineral Yearbooks). Not authoritative — verify against primary sources before relying on it. The MSHA panel above is the current authoritative source for actively-permitted mines.

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