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Gradishte

Producer in Plovdiv, Bulgaria with commodities Copper, Lead, Silver, Zinc
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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. Ownership information
  11. Production statistics
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10158300
MAS/MILS ID 4870230022
Record type Site
Current site name Gradishte
Alternate or previous names Gidjurska, Erma Reka, Marzjan, Stefan Stefanov

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: 25.11847, 41.3654 (WGS84)
Location accuracy 10000(meters)

Site location context

Political divisions (FIPS codes)

Plovdiv(province)

Bulgaria(country)

Geographic areas

Country State
Bulgaria Plovdiv

Commodities

Commodity Importance
Copper Tertiary
Lead Primary
Silver Tertiary
Zinc Critical Primary

Materials information

Materials Type of material
Galena Unknown
Sphalerite Unknown

Nearby scientific data

Ore Body (1) 25.11847, 41.3654
ListMap

Economic information

Ore body information

  • Thickness 3M
    Field Value
    MAS Matrix # 1
    MAS Column # 4
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 IRREGULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FRACTURING
    Date of Last Modification 940317

Comments on the geologic information

  • THE ORE DEPOSITS WERE FORMED DURING THE END OF THE MIOCENE ERA, WITH HYDROTHERMAL SOLUTIONS BEING INTRUDED INTO COUNTRY ROCK. THE DEPOSITS CONSIST MAINLY OF GALENA AND SPHALERITE AND ARE ASSOCIATED WITH A SERIES OF NORTH-WEST TRENDING BREAKS IN A GNEISS COMPLEX. THE HYDROTHERMAL VEINS ARE ASSOCIATED WITH BREAKS AND HAVE AN AVERAGE DIP OF 80 DEGREES.

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Metallic
Significant Yes
Mining method Shrinkage Methods
Year of first production 1964
Milling method Flotation

Ownership information

  • Type Unknown
    Owner Gorubso
    Home office Bulgaria
    Year 1990

Production statistics

  • Year 1984
    Description Ore Throughput/Yr (Est) 900000 Mt Ore
  • Year 1985
    Description Ore Throughput/Yr (Est) 900000 Mt Ore
  • Year 1986
    Description Pyrite Concentrate Production/Yr 24300 Mt Conc
  • Year 1986
    Description Zinc Concentrate Production/Yr 14200 Mt Conc
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Zinc Zinc 14200mt
  • Year 1986
    Description Lead Concentrate Production/Yr 16100 Mt Conc
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Lead Lead 16100mt
  • Year 1986
    Description Ore Throughput/Yr 964000 Mt Ore
  • Year 1987
    Description Pyrite Concentrate Production/Yr 24600 Mt Conc
  • Year 1987
    Description Zinc Concentrate Production/Yr 14200 Mt Conc
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Zinc Zinc 14200mt
  • Year 1987
    Description Lead Concentrate Production/Yr 14700 Mt Conc
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Lead Lead 14700mt
  • Year 1987
    Description Ore Throughput/Yr 958000 Mt Ore
  • Year 1988
    Description Pyrite Concentrate Production/Yr 22400 Mt Conc
  • Year 1988
    Description Zinc Concentrate Production/Yr 13800 Mt Conc
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Zinc Zinc 13800mt
  • Year 1988
    Description Lead Concentrate Production/Yr 13500 Mt Conc
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Lead Lead 13500mt
  • Year 1988
    Description Ore Throughput/Yr 928000 Mt Ore
  • Year 1989
    Description Pyrite Concentrate Production/Yr 19100 Mt Conc
  • Year 1989
    Description Zinc Concentrate Production/Yr 12900 Mt Conc
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Zinc Zinc 12900mt
  • Year 1989
    Description Lead Concentrate Production/Yr 10800 Mt Conc
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Lead Lead 10800mt
  • Year 1989
    Description Ore Throughput/Yr 888000 Mt Ore

Comments on the production information

  • THE LEAD CONCENTRATE CONTAINS LEAD, SILVER, AND COPPER. THE ZINC CONCENTRATE CONTAINS ZINC, IRON, COPPER, LEAD, AND SULFUR.

Comments on the reserve resource information

  • NO INDIVIDUAL DEPOSIT RESOURCE INFORMATION IS AVAILABLE. CRU REPORTS THAT ANOTHER 8,630,000 MT OF PROBABLE ORE COULD POSSIBLY BE EXPLOITED.
  • COMMODITY GRADES ARE AVERAGE GRADES FOR ALL FIVE DEPOSITS IN THE GORUBSO DIVISION II.

Workings at the site

  • Type of workings Underground
    Overall depth 650M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method SHRINKAGE W/CAVING
    Year of Information 1990

Comments on other economic factors

  • ALL ORE FROM GRADISHTE, 20,000 MT/YR FROM STEFAN STEFANOV, AND 50,000 MT/YR FROM MARZJAN IS SENT TO RUDOZEM CONCENTRATOR - APPROXIMATELY 20% OF 1989 PRODUCTION FROM GORUBSO DIV II. LEAD AND ZINC CONCENTRATES FROM ERMA REKA ARE SENT TO THE KURDJAZI SMELTER; PYRITE CONCENTRATES ARE TREATED AT THE DIMITROVGRAD CHEMICAL WORKS. ALL LEAD CONCENTRATES AND SOME ZINC CONCENTRATES FROM RUDOZEM ARE SENT TO THE DIMITUR BLAGOEV SMELTER. THE REMAINING ZINC CONCENTRATES ARE SENT TO THE GEORGI DIMITROV SMELTER.
  • THE SHAFTS AT DIVISION II ARE THE DEEPEST OF THE GORUBSO GROUP, WITH THE DEEPEST SHAFT AT A DEPTH OF 650M. TEMPERATURES AT THIS DEPTH ARE BEGINNING TO BECOME A PROBLEM. CRU REPORTS THAT ALL MINES HAVE TWO SHAFTS. MOST OF THE ORE IS MINED USING SHRINKAGE STOPING, BUT SOME OF THE ORE IS RECOVERED BY SUB-LEVEL CAVING. CRU REPORTS THAT ALTHOUGH WASTE CAN BE AS HIGH AS 20%, OVERALL ORE RECOVERY IS 94%. WHEN NOT BEING USED TO HOIST PERSONNEL, THE SHAFT SKIPS CAN BE USED TO HOIST ORE. ORE IS ALSO HOISTED IN 1MT HOPPERS.
  • THE MILL RECORD REPRESENTS THE MILLING OPERATIONS AT ERMA REKA. ORE CONCENTRATED AT RUDOZEM IS CONCENTRATED IN ESSENTIALLY THE SAME WAY. ORE IS CRUSHED IN THREE STAGES, THEN MILLED IN TWO 2.7 AND 2.75 M LONG BALL MILLS. CONCENTRATED ORE IS THEN SENT THROUGH A 1.5 M SPIRAL CLASSIFIER. GROUND ORE (45% 80 MICRONS) IS FED TO DENVER 300 FLOTATION CELLS, WHERE LEAD IS RECOVERED. UNDERFLOW IS THICKENED, RE-GROUND, AND SENT TO SCAVENGER CELL, WHERE ZINC AND PYRITE SEPARATED. THICKENERS AND VACUUM DRUM FILTERS ARE USED FOR FINAL CONCENTRATE PREPARATION.

Reference information

Bibliographic references

  • Deposit

    COMMODITIES RESEARCH UNIT, LTD. THE BASE METALS INDUSTRIES

  • Deposit

    OF EASTERN EUROPE, VOL I AND II, 1990, LONDON.

  • Deposit

    DOKOV, R. ET AL, GEOLOGICAL INSTITUTE - BULGARIAN ACADEMY OF

  • Deposit

    SCIENCES, METALLOGENIC MAP OF BULGARIA, SOFIA, 1989.

General comments

Subject category Comment text
Deposit THIS REPORT REPRESENTS ALL FIVE MINES IN THE GORUBSO DIVISION II GROUP. FOR SPECIFIC INFORMATION ABOUT EACH OF THE MINES IN THE GROUP, SEE THE FOLLOWING DEPOSIT FILES: GIDJURSKA -------- 4870230021 GRADISHTE -------- 4870230022 ERMA REKA -------- 4870230023 STEFAN STEFANOV -- 4870230024 MARZJAN ---------- 4870230025 CRU REPORTS THAT THERE ARE PLANS TO INCREASE CAPACITY OF THE PLANT TO 930,000 MT/YR. ALSO, GEOTHERMAL ENERGY MAY BE EXPLOITED. THE LATITUDE AND LONGITUDE ARE FOR ZLATOGRAD. THIS IS A CENTRAL LOCALITY FOR THE FOUR MINES, LOCATED AROUND ZLATOGRAD.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-95 Difrancesco, Carl A. 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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