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Kropfmuhl

Producer in Bayern [Bavaria], Germany with commodity Graphite
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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. Workings at the site
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10134431
MAS/MILS ID 4280500003
Record type Site
Current site name Kropfmuhl

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: 13.70214, 48.64872 (WGS84)
Elevation 500
Location accuracy 1000(meters)

Site location context

Political divisions (FIPS codes)

Bayern [Bavaria](province)

Germany(country)

Europe(continent)

Land(continent)

Geographic areas

Country State
Germany Bayern [Bavaria]

Commodities

Commodity Importance
Graphite Critical Primary

Materials information

Materials Type of material
Graphite Unknown

Nearby scientific data

Ore Body (1) 13.70214, 48.64872
ListMap

Economic information

Ore body information

  • Strike N90E
    Dip 60S
    Thickness 1.5M
    Length 900M
    Width 980M
    Depth to top 200M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Shape of Orebody #2 LENTICULAR
    Primary mode of Origin SEDIMENTATION
    Secondary mode of Origin METAMORPHISM
    Primary Ore Control FOLDING
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. UNKNOWN
    Strike And Dip N90E:60S
    Minimum Depth to Top 80
    Date of Last Modification 850102
  • Area 300HA
    Field Value
    Total Surface Area (HA) 300
    Date of Last Modification 910418

Comments on the geologic information

  • ROCK AND ORE HORIZONS GREATLY AFFECTED BY FOLDING AND TECTONISM. CODED STRIKE DIRECTION IS THE GENERAL AXIS OF MAJOR FOLDING. ON A N-S SECTION, THE ORE HORIZONS HAVE AN APPARENT DIP RANGING FROM 60 TO 80 DEGREES TO BOTH THE NORTH AND SOUTH (PREDOMINANTLY SOUTH).

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Non-metallic
Significant Yes
Discovery year 1220
Mining method Filled Stopes - Other Filled Stope Methods
Year of first production 1882
Milling method Flotation

Ownership information

  • Type Owner-Operator
    Owner Grafitwerk Kropfmuhl Ag
    Interest 100
    Home office Germany Fr
    Year 1983

Comments on the ownership information

  • GRAFITWERK KROPFMUHL IS A PUBLIC COMPANY WHOLLY OWNED BY THREE PARTIES.

Comments on the production information

  • THE PRODUCT GRADE IS AN AVERAGE FOR ALL PRODUCTS. IT IS WEIGHTED BASED ON ESTIMATED TONNAGES PRODUCED AT VARIOUS CARBON GRADES. ABOUT 30% OF ALL PRODUCTS HAVE A GRADE GREATER THAN 99% C. THE OTHER 70% FALLS IN THE RANGE OF 60-96% C.
  • ACCORDING TO COMPANY LITERATURE, GK PRODUCES 18 DIFFERENT GRAPHITE CONCENTRATES RANGING IN GRADE FROM 60 TO 99.98% CARBON AND IN SIZE FROM MATERIAL AS SMALL AS 2 MICRONS TO MATERIAL GREATER THAN 630 MICRONS. BECAUSE THERE ARE 5 STAGES OF FLOTATION, MATERIAL MAY BE RECOVERED FROM THE VARIOUS STAGES AT GRADES OF 60, 70, 82, 90, OR 96% CARBON. THE FIFTH FLOTATION STAGE PRODUCES MATERIAL OF 96% CARBON, BUT MAY ASSAY AS HIGH AS 98% CARBON. AN UNDETERMINED PERCENTAGE OF THIS MATERIAL IS CHEMICALLY REFINED TO PRODUCE PRODUCTS OF VARYING SIZE RANGES THAT ASSAY FROM 96 TO 99.98% CARBON. FOR THE PURPOSES OF EVALUATION, THE CONTRACTOR ESTIMATED THE PROPORTIONS OF PRODUCTS AT VARIOUS CARBON GRADES, REGARDLESS OF SIZE DISTRIBUTIONS. THESE ESTIMATES FOLLOW: CARBON MTPY FROM % OF GRADE KROPFMUHL TOTAL FEED ONLY PRODUCTION 60% 211 4.9 70% 211 4.9 82% 421 9.8 90% 700 16.3 96% 1405 32.7 97% 507 11.8 98% 507 11.8 99% 335 7.8 TOTALS 4297 100.0 THE ABOVE FIGURES REFLECT ONLY FEED FROM THE KROPFMUHL MINE, AND DO NOT INCLUDE FEED FROM OTHER SOURCES. SEE THE CONCENTRATOR (K) COMMENTS FOR FURTHER DISCUSSION OF OTHER SOURCES OF FEED. THE OVERALL AVERAGE GRADE OF GRAPHITE CONCENTRATES IS ESTIMATED AT 93.1% CARBON. FLOTATION PROCUCT GRADE IS ESTIMATED TO AVERAGE 88.2% CARBON, AND THE OVERALL AVERAGE GRADE OF PRODUCTS FROM THE CHEMICAL PLANT IS ESTIMATED AT 97.88% CARBON.
  • THE KROPFMUHL DEPOSIT HAS BEEN MINED MORE-OR-LESS CONTINUOUSLY SINCE THE YEAR 1220. NO PAST PRODUCTION FIGURES ARE AVAILABLE FOR KROPFMUHL.

Comments on the reserve resource information

  • M1C1=M9C4. QUANTITY DATA ESTIMATED BY ZELLARS-WILLIAMS, INC. FROM GEOMETRY OF OREBODY. RESOURCE INCLUDES 100% DILUTION AND IS 100% RECOVERABLE. THE ACTUAL MINE RECOVERY OF 80% HAS BEEN INCLUDED IN THE RESOURCE TONNAGES.
  • RESERVE TONNAGE IS UPDATED TO DEC, 1988.
  • NEED INFORMATION ON THE ORE TONNAGE SENT TO KROPHMUHL MILL FROM OTHER COUNTRIES TO BE PROCESSED.

Workings at the site

  • Type of workings Underground
    Overall depth 270M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method HORIZ CUT & FILL W/WASTE ROCK 10-60
    Swell Factor .6
    Percent Recovery 100
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNKNOWN
    Mine Support Chars. UNKNOWN
    Number of Shafts 1
    1st Condition of Workings OPEN
    Capacity 115.5
    Capacity Units MT ORE/DAY
    Unit Production Cost 46
    Units of Production $/MT ORE
    Operating Days per Year 220
    Operating Shifts per Day 1
    Year of Information 1983

Comments on other economic factors

  • RECOVERY IS ACTUALLY 80%, BUT THIS HAS ALREADY BEEN ACCOUNTED FOR IN THE Q1 MATRIX, WHICH SHOWS RECOVERABLE, DILUTED ORE. THE TOTAL NUMBER AND AVERAGE DEPTHS OF THE SHAFTS IS NOT KNOWN, BUT IT IS BELIEVED THAT THE ONLY SHAFT USED IS THE MAIN SHAFT, KNOWN AS THE ERHARD SHAFT. IT IS 270 METERS DEEP. A NUMBER OF ADITS OF UNKNOWN LENGTH EXIST. THEY ARE EVIDENTLY USED FOR BOTH ACCESS AND MINE DEWATERING. THE TOTAL WORKINGS LENGTH IS UNKNOWN BUT EXTENSIVE. THE WORKINGS EXTEND OVER AN AREA ABOUT 5200 METERS IN LENGTH BY 1600 METERS IN WIDTH. SOME OF THESE WORKINGS ARE HUNDREDS OF YEARS OLD.
  • ORE TRANSPORTATION FROM MINE TO MILL IS BY HOIST. THE COST IS INCLUDED IN THE MINE OP. COST. GRAPHITE CONCENTRATE IS SHIPPED BY TRUCK 20 KM TO THE RAILHEAD AT PASSAU AND THEN BY RAIL 950 KM TO HAMBURG. THE COST OF THE TRUCK TRANSPORTATION IS INCLUDED IN THE RAIL COST. THE COST IS $24.73/MT OF PRODUCT.

Reference information

Bibliographic references

  • Deposit

    BRITTANICA ATLAS WITH 1968 RAND-MCNALLY PLATES

  • Deposit

    INTERVIEWS WITH GRAFITWERK KROPFMUHL PERSONNEL THOMAS FREY,

  • Deposit

    COMMERCIAL DIRECTOR, AND KARL GOHLA, TECHICAL DIRECTOR,

  • Deposit

    CONDUCTED BY INVESTIGATORS T.P. OXFORD AND A.R. STILL,

  • Deposit

    6/27/83-6/28/83.

General comments

Subject category Comment text
Deposit COST DATA FOR THIS PROPERTY WERE GATHERED UNDER BUREAU OF MINES CONTRACT J0225019, "THE DEVELOPMENT OF ENGINEERING AND COST DATA FOR FOREIGN GRAPHITE PROPERTIES"; THE CONTRACT WAS AWARDED TO ZELLARS-WILLIAMS, INC. IN SEPTEMBER 1982.

Reporter information

Type Date Name Affiliation Comment
Reporter 19-APR-95 Z&W Inc 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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