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Alpacay Gold-Copper Deposit 77

Producer in Arequipa, Peru 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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Ownership information
  14. Production statistics
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10068874
MRDS ID W002146
Record type Site
Current site name Alpacay Gold-Copper Deposit 77

Geographic coordinates

Geographic coordinates: -72.8663, -15.84773 (WGS84)
Elevation 2400
Relative position 8-10 KM SW AND WSW OF YANAQUIHUA AND ANDARAY, ON AND NEAR THE DIVIDE BETWEEN THE CHURUNGA (CHORUNGA) AND CHULCA (CHUICA) VALLEYS IN THE PROVINCE OF CONDESUYOS (CHUQUIBAMBA SHEET).

Site location context

Political divisions (FIPS codes)

Arequipa(province)

Peru(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Peru Arequipa

Comments on the location information

  • NO. 77 ON METALLOGENIC MAPS OF PERU, 1969 SHOWN AS COPPER ON MAP

Commodities

Commodity Importance
Gold Primary
Copper Primary

Comments on the commodity information

  • GANGUE MINERALS ARE QUARTZ, CALCITE GOLD OCCURS IN AURIFEROUS PYRITE INCLUDED IN QUARTZ VEINS ALONG WITH LITTLE CHALCOPYRITE AND CALCITE. WHERE CALCITE WAS ABUNDANT IT COMMONLY WAS CUT BY VEINLETS OF AURIFEROUS PYRITE. GOLD ALSO OCCURRED FREE IN QUARTZ. THE GRAINS OF GOLD AVERAGED 0.012-0.025 MM (12-25 MICRONS) ACROSS. GOLD CONTENT RANGED FROM 6 TO 18 GRAMS PER TON, AVERAGING PROBABLY 11-13 G/TON/AU.

Materials information

Materials Type of material
Chalcopyrite Ore
Calcite Gangue

Alteration

  • (Local) Feldspars As Much As 3 M. From Vein Walls Are Altered To Calcite And Sericite And The Dark Minerals To Chlorite; Also, Clay Has Formed At The Vein Walls.

Analytical data

Result GRANODIORITE (CUT BY FRACTURES BEARING GOLD) COMPOSED OF QUARTZ (25%), ORTHOCLASE (20%), PLAGIOCLASE (35%), HORNBLENDE (15%), BIOTITE (5%)

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -72.8663, -15.84773
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description See Comments

Ore body information

  • Strike E
    Dip 75
    Length 250M
    Width 0.4M
    Depth to bottom 300M

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No
Discovery year 1680
Year of first production 1680

Ownership information

  • Type Owner
    Owner Cia. Minera Alpacay
    First year 1939
    Last year 1951

Production statistics

  • Year 1951
    Period 1939 - 1951
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^6 - 18 G Au/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 12g/mt
  • Year 1951
    Period 1939 - 1951
    Material CU
    Accuracy Estimate
    Description Cp_Grade: ^1 - 3 % Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Copper Copper 2wt-pct
  • Year 1951
    Period 1939 - 1951
    Material AU
    Accuracy Accurate
    Description Cp_Grade: ^6 - 18 G Au/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Gold Gold 12wt-pct

Comments on the production information

  • ESTIMATE OF ORE AMOUNT BASED ON AVERAGE GOLD CONTENT OF 12 G/TON AU; COPPER BASED ON 2% CU

Comments on the reserve resource information

  • INSUFFICIENT DATA 3/74 TO MAKE ESTIMATE. METALLOGENIC MAPS OF PERU INDICATE A DEPOSIT CONTAINING BETWEEN 100,000 AND ONE MILLION TONS OF ORE.

Reference information

Bibliographic references

  • Deposit

    SIMONS, FRANK, 1960, UNPUBLISHED REPORT, P. 344

  • Deposit

    PERU-MAPA METALOGENETICO, 1969, AND, GUIA PARA EL MAPA METALOGENETICO DEL PERU, SOCIEDAD NACIONAL DE MINERIA Y PETROLEO, LIMA, PERU, NOV. 1969

  • Deposit

    AGUILAR, REVOREDO, J.F., 1941, CURSO DE GEOLOGIA ECONOMICA DE YACIMIENTOS MINERALES: ESCUELA NAC. ING., INST. NAC. POLITECHNICO SUPERIOR, P. 54-55

  • Deposit

    1960 COMPILE FRANK SIMONS, UNPUB. REP

  • Production

    F. SIMONS, 1960, UNPUB REP.

  • Reserve-Resource

    METALLOGENIC MAPS OF PERU. 1969, 1972

General comments

Subject category Comment text
Deposit First Production Year: 1680; OPERATED AT INTERVALS UNTIL 1951

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1973 Shaffer, Glenn 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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