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Pierrepont Mine

Past Producer in St. Lawrence county in New York, United States with commodities Zinc, Lead
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Mineral rights holdings
  17. Ownership information
  18. Production statistics
  19. Reserves and resources
  20. Workings at the site
  21. Links to other databases
  22. Bibliographic references
  23. General comments
  24. Reporter information

Geologic information

Identification information

Deposit ID 10082073
MRDS ID W044665
Record type Deposit
Current site name Pierrepont Mine

Geographic coordinates

Point of reference Centroid
Geographic coordinates: -75.00111, 44.54222 (WGS84)
Location accuracy 100(meters)
Relative position 0.55 miles east of the main intersection in Pierrepont, NY.

Site location context

Political divisions (FIPS codes)

St. Lawrence(county)

New York(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pierrepont(quadrangle 1:24,000 scale)

Ogdensburg(quadrangle 1:100,000 scale)

Ogdensburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Great Lakes(hydrologic region)

Geographic areas

Country State County
United States New York St. Lawrence

Commodities

Commodity Importance
Zinc Critical Primary
Lead Secondary

Materials information

Materials Type of material
Sphalerite Ore

Alteration

  • (Local) Dolomitization
  • (Local) Silicification

Mineral occurrence model information

Model code 208
USGS model code 31a
Deposit model name Sedimentary exhalative Zn-Pb
Mark3 model number 13

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Marble
    Rock unit name Upper Marble Formation
    Rock description Upper Marble Formation
    Stratigraphic age (youngest) Proterozoic

Nearby scientific data

Centroid (1) -75.00111, 44.54222
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Northwest plunging isoclinal fold

Ore body information

  • General form STRATABOUND
    Strike NE
    Dip 20-45 NW
    Plunge direction NW
    Thickness 18.29M
    Depth to bottom 228.6M
  • Area 60HA
    Depth to top 84M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 MASS SULFIDE
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 REPLACEMENT
    Shape of Orebody #2 LENTICULAR
    Type of Orebody #3 SEDIMENTARY
    Primary mode of Origin METAMORPHISM
    Primary Ore Control FOLDING
    Secondary Ore Control BEDDING
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 DOLOMITIZATION
    Type of Wallrock Alter. #2 CARBONATE SILIC
    Minimum Depth to Top 61
    Total Surface Area (HA) 60
    Date of Last Modification 960923

Controls for ore emplacement

  • Northwest Plunging Isoclinial Fold

Comments on the geologic information

  • Host rocks are dolomitic and silicated marbles. Proterozoic rocks of the Balmat-Edwards district are part of the Grenville Supergroup.

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery year 1979
Discoverer St. Joe's Mineral Resources geologists
Mining method Open Stope
Year of first production 1982
Plant type Beneficiation (Mill)
Milling method Flotation

Mining district

District name Balmat-Edwards District

Mineral rights holdings

Type of mineral rights Fee Ownership
Type of mineral rights Private Lease
Type of mineral rights Minerals Only

Ownership information

  • Type Owner-Operator
    Owner St. Joe's Mineral Resource Co., Unit Of Fluor Co.
    First year 1986
  • Type Operator
    Owner Zinc Corp. Of America
    ID 3002577
    Interest 100
    Home office P. O. Box 2266, Hailesboro, Ny 13645
    Year 1993

Production statistics

  • Year 2001
    Period 1982-2001
    Material ore
    Ore mined 2556000mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major zinc Zinc Zinc 16wt-pct

Reserves and resources

  • Type In-situ
    Estimate year 1983
    Measured 2268000mt ore
    Demonstrated 4536000mt ore
    Inferred 2268000mt ore
    Total resources 6804000mt ore
    Remarks 86 BROOK-HUNT DATA.
    Commodity Subtype Grade units Group Importance Year
    Zinc Zn 16 wt-pct Zinc Major 1983

Comments on the reserve resource information

  • M9C4=M1C1 THE DILUTED RECOVERABLE TONS AND GRADES ARE 1,879,000 MT AT 13.91 PERCENT ZN AND 0.30 PERCENT PB.

Workings at the site

  • Type of workings Underground
    Overall depth 230M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OTHER OPEN STOPE METHODS
    Percent Waste Rock 40
    Percent Recovery 85
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. OTHER
    Number of Shafts 3
    Length of Inclines (m) 1830
    Slope of Inclines 15
    Number of Inclines 1
    1st Condition of Workings OPEN
    Capacity 544
    Capacity Units MT ORE/DAY
    Unit Production Cost 27.57
    Units of Production $/MT ORE
    Operating Days per Year 200
    Operating Shifts per Day 2
    Year of Information 1985

Comments on other economic factors

  • AS OF 1996, ORE IS TRUCKED TO THE BALMAT MILL. THE MILL HAD SEVERAL FLOTATION CELLS ADDED TO HANDLE THE HIGH-GRADE PIERREPONT ORE.

Comments on development

  • EXPLORATION PROGRAM USED TO FIND THE DEPOSIT WAS BASED ON ROCK TYPE AND STRUCTURE.
  • In 2001 the Pierrepont mine was permanently closed and reclaimed. (New York State Department of Environmental Conservation Division of Mineral Resources; New York State 2006 Mineral Fact Sheets, p. 12).

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit Two orebodies are found -- the Grange, and 1500 feet to the east is the Crary.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-85 Nyahay, Richard E. (Kelly, William M.) New York State Geological Survey
Reporter 09-OCT-96 Smith U.S. Bureau of Mines
Editor 14-NOV-03 Woodruff, Laurel G. U.S. Geological Survey Work done in Filemaker

Beyond USGS

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

Current status (per MSHA)

StatusAbandoned since 10/01/2001
MSHA mine ID3002577
Mine name (MSHA)PIERREPONT PROPERTY
Current operatorZca Mines Inc
Current controller (parent)Horsehead Industries Inc
Mine typeUnderground (Metal / non-metal)

MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

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