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Kochkar Deposit

Producer in Kazakhstan with commodities Gold, Silver, PGE, Arsenic, Copper, Antimony, Lead, Cobalt, Molybdenum, Tungsten, Bismuth
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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. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10085921
MRDS ID W701772
Record type Site
Current site name Kochkar Deposit

Geographic coordinates

Geographic coordinates: 49.71817, 49.08145 (WGS84)

Site location context

Political divisions (FIPS codes)

Kazakhstan(country)

Geographic areas

Country
Kazakhstan

Comments on the location information

  • ON THE EASTERN SLOPE OF THE URALS.

Commodities

Commodity Importance
Gold Primary
Silver Secondary
PGE Critical Secondary
Arsenic Critical Tertiary
Copper Tertiary
Antimony Critical Tertiary
Lead Tertiary
Cobalt Critical Tertiary
Molybdenum Tertiary
Tungsten Critical Tertiary
Bismuth Critical Tertiary

Comments on the commodity information

  • GOLD OCCURS MOST FREQUENTLY IN QUARTZ, PYRITE AND COARSELY CRYSTALLINE ARSENOPYRITE, IN CLOSE ASSOCIATION WITH TETRADYMITE, CHALCOPYRITE AND TETRAHEDRITE-TENNANTITE.

Materials information

Materials Type of material
Chalcopyrite Ore
Cobaltite Ore
Galena Ore
Gold Ore
Marcasite Ore
Molybdenite Ore
Pyrite Ore
Pyrrhotite Ore
Scheelite Ore
Tetradymite Ore
Quartz Gangue
Tourmaline Gangue

Alteration

  • (Local) Silicification, Carbonitization. Dike Rocks Altered To Friable "Tobashka" - "Tobacco Color" Alteration Consisting Of Biotite, Phlogopite, Amphibole, And Feldspar With Some Epidote, Sphene, Chlorite, Tourmaline, Apatite, Calcite And Rutile. The Total Number Of Dikes Altered To Friable "Tobashka" Exceeds 1500. The Total Thickness Of Altered Dikes Reaches 2500 M. Swarms Of Dikes Occur In Zones Striking Ne And Ew.

Analytical data

Result GOLD CONTENT IN ARSENOPYRITE RANGES FROM 4 TO 50 G/TON. GOLD IS PRESENT AS GRAINS RANGING FROM 0.001 TO SEVERAL MILLIMETERS, AND IN RARE CASES, AS NUGGETS WEIGHING UP TO 270 GRAMS. GOLD IS 800 TO 970 FINE AND CONTAINS UP TO 35% SILVER AND PLATINUM GROUP METALS ( UP TO 3% AG AND UP TO 10% PT IN ONE OF THE VEINS).

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic)
    Rock unit name Demarinskiye Massif;;;;;;
    Rock description Demarinskiye Massif;;;;;;
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Kochkar
    Rock description Kochkar

Nearby scientific data

(1) 49.71817, 49.08145
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Major Massif Of Plagioclase Granite
Type of structure Local
Structure description Intruded Dikes Along Shear Fractures

Ore body information

  • General form IRREGULAR DIKES AND FRACTURE FILLED VEINS

Controls for ore emplacement

  • Dikes And Fractures.

Comments on the geologic information

  • THE KOCHKAR ORE FIELD IS ASSOCIATED WITH THE EXOCONTACT OF MICROCLINE GRANITES. MINERALIZATION DECREASES IN INTENSITY FROM WEST TO EAST WITH INCREASE IN DISTANCE FROM THE MASSIF OF MICROCLINE GRANITES. THE GREATEST DEPOSITION OF GOLD TAKES PLACE TOGETHER WITH SULFIDES (PARTICULARLY ARSENOPYRITE) OF LATE GENERATION. THE SWARM DIKES ARE OF THREE TYPES: 1. PLAGIOCLASE PEGMATITES, PLAGIOCLASE APLITES, AND PLAGIOCLASE GRANITE-PORPHYRIES - DERIVATIVES OF KOCHKAR PLAGIOCLASE GRANITES. 2. MOTTLED SERIES OF STRONGLEY METAMORPHOSED DIKES OF DIORITE, DIORITE PORPHYRIES, DIABASES, DACITE PORPHYRIES, SYENITE PORPHYRIES, AND FELSITES. THE STRIKE OF DIKES OF THIS COMPOSITION IS CLOSE TO E-NE. THE DIKES FORM BELTS IN THE EAST AND CONTINUE BEYOND THE BOUNDARIES OF THE PLAGIOCLASE GRANITES. 3. MICROGRANITES, PEGMATITES, AND APLITES - DERIVATIVES OF DEMARINSKIYE MICROCLINE GRANITES. IN THE CONTACT ZONE AFFECTED BY MICROCLINE GRANITES, THE DIKES ARE METAMORPHOSED TO DARK FRIABLE ROCK LOCALLY CALLED
  • "TABASHKA". ORE VEINS DEVELOPED IN THE FOLLOWING STAGES: 1. RECRYSTALLIZATION AND SEALING OF QUARTZ VEINS FORMED PRIOR TO ORE DEPOSITION AND CARBONATIZATION OF ALTERED ROCKS AND FORMATION OF VEINLETS. 2. REPLACEMENT OF THE CARBONATIZED PARTS OF THE "TABASHKA" BY QUARTZ; DEVELOPMENT OF ASSOCIATED VEINLETS. 3. DEPOSTION OF THE BULK SULFIDES AND GOLD - INCLUDING DEPOSITION OF ARSENOPYRITE AND PYRITE, AND FORMATION IN ARSENOPYRITE AND PYRITE OF THIN VEINLETS OF LATE GENERATION SULFIDES (TETRADYMITE, CHALCOPYRITE, TETRAHEDRITE-TENNANTITE, BOURNONITE, JAMESONITE, GALENA, SPHALERITE AND OTHERS). 4. DEPOSITION OF MILKY QUARTZ, TOURMALINE, PYRITE, AND PINK CARBONATE.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Large
Significant No

Comments on development

  • ECON.COM: KOCHKAR HAS BEEN MINED FOR OVER ONE HUNDRED YEARS AND HAS YIELDED A GREAT AMOUNT OF GOLD FROM VEIN DEPOSITS AND PLACERS.

Reference information

Bibliographic references

  • Deposit

    MAGAK'YAN, I.G., 1968, ORE DEPOSITS: IGR, V. 10, N.9, P. 141-202

General comments

Subject category Comment text
Deposit THE KOCHKAR GOLD-BEARING FIELD CONSISTS OF DIKE SWARMS AND FRACTURE FILLED VEINS LOCATED WITHIN A MAJOR MASSIF OF PLAGIOCLASE GRANITE, AND OCCUPYING AN AREA OF 50 X 15 TO 20 KM EXTENDING IN A N-S DIRECTION. VEINS OF ECONOMIC INTEREST FORM A SYSTEM OF FLAT LENSES, HAVING A THICKNESS FROM 0.4 OR 0.6 TO 2 M, AND ARE FOLLOWED ALONG STRIKE FOR A FEW TENS OR HUNDREDS OF METERS. THE SYSTEM OF FRACTURES FILLED WITH ORE-BEARING VEINS DUPLICATES IN MANY AREAS THE OLDER SYSTEM ALONG WHICH DIKES INTRUDED. THE THICKNESS OF DIKE SWARMS RANGES FROM 30 TO 6O M AND THEIR KNOWN LENGTH IS 2 TO 2.5 M. IN THE EAST, DIKES AND THE ACCOMPANYING VEINS BRANCH INTO A SERIES OF THIN APOPHYSES, THIS CREATES AN IMPRESSION OF A FANLIKE DISTRIBUTION OF VEINS. MOST OF THE ORE-BEARING VEINS ARE WITHIN THE BOUNDARIES OF THREE MAIN ZONES OF DIKES: THE NORTHERN, CENTRAL AND SOUTHERN ZONES, FORMING SYSTEMS OF CONTIGUOUS VEINS. THE SYSTEMS OF VEINS ARE ALMOST PARALLELL TO EACH OTHER, STRIKE TO THE NE AT 65-70
Deposit DEGREES, AND DIP STEEPLY TO THE SE. TWO THIRDS OF ALL VEINS ARE IN THE CENTRAL PART OF THE ORE FIELD, OCCUPYING AN AREA OF 17 SQUARE KM. THE TOTAL NUMBER OF VEINS EXCEEDS 1000, 200 OF WHICH ARE OF ECONOMIC INTEREST. SOUTH OF THIS ORE FIELD THE VEINS CONTAIN ARSENOPYRITE MINERALIZATION AND ARE WEAKLY AURIFEROUS. THE RICHEST ORE SHOOTS ARE AT JUNCTURES OF VEINS STRIKING EW WITH THOSE STRIKING NE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1990 Paidakovich, Matthew E. U.S. Geological Survey
Updater 01-JUN-1992 Moyer, Lorre A. (Marcus, S.M.) U.S. Geological Survey

Beyond USGS

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

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