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Grand Isle Block 18 Mine

Producer in Plaquemines county in Louisiana, United States with commodities Sulfur, Halite, Limestone, Ultra Pure
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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. Economic information about the deposit and operations
  14. Land status
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10061186
MRDS ID TC34044
Record type Site
Current site name Grand Isle Block 18 Mine

Geographic coordinates

Geographic coordinates: -89.94008, 29.16027 (WGS84)
Relative position 6 MI SE OF GRAND ISLE

Site location context

Political divisions (FIPS codes)

Plaquemines(county)

Louisiana(state)

United States(country)

USGS map quadrangles

Grand Isle(quadrangle 1:24,000 scale)

Mississippi River Delta(quadrangle 1:100,000 scale)

Breton Sound(quadrangle 1:250,000 scale)

Geographic areas

Country State County
United States Louisiana Plaquemines

Comments on the location information

  • APPROXIMATELY 6.25 MILES FROM PLAQUEMINES PARISH. LOCATION OF SULFUR PRODUCTION PLATFORM IN GRAND ISLE BLOCK 9.

Commodities

Commodity Importance
Sulfur Primary
Halite Tertiary
Limestone, Ultra Pure Tertiary

Materials information

Materials Type of material
Halite Ore

Alteration

  • (Local) Biogenic Alteration Of Anhydrock To Limestone

Mineral occurrence model information

Model code 255
USGS model code 35a.7 (35ag)
Deposit model name Salt-dome sulfur

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Louann
    Rock description Louann
    Stratigraphic age (youngest) Middle Jurassic
  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Salt

Nearby scientific data

(1) -89.94008, 29.16027
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Piercement Salt Dome

Ore body information

  • Thickness 129.54M
    Depth to top 548.64M

Economic information about the deposit and operations

Development status Producer
Commodity type Non-metallic
Deposit size Large
Significant No
Discovery year 1949
Discoverer Humble Oil And Refining Co.
Year of first production 1960

Land status

Ownership category State Offshore

Ownership information

  • Type Operator
    Owner Freeport Sulfur Co.
  • Type Owner
    Owner State Of Louisiana
    Home office Louisiana

Comments on the production information

  • PRODUCTION DECLINING SINCE 1974. NEARLY EXHAUSTED 1989.

Comments on the reserve resource information

  • ESTIMATED TOTAL PRE-MINING RESOURCE

Comments on the workings information

  • FRASCH PRODUCTION OF SULFUR FROM OFFSHORE DRILLING PLATFORM. TEN PRODUCING WELLS IN 1960.

Comments on development

  • DOME DISCOVERED 1948 BY SEISMIC REFLECTION. SULFUR DISCOVERED 1949 DURING OIL TEST. HUMBLE DRILLED 10 SULFUR EXPLORATION WELLS IN 1953. ; DEV$: 30,000 ; ECON.COM: SOLD 9/19/56 TO FREEPORT. CUT OFF GRADE IS 5% S. WELLS WITH LESS THAN 20,000 LT SULFUR-IN-PLACE NOT ECONOMIC.

Reference information

Bibliographic references

  • Deposit

    WAGUESPACK, S.J., 1983, SALT DOMES OF SOUTH LOUISIANA: NEW ORLEANS GEOLOGICAL SOCIETY, V. 3, P. 34-35.

  • Deposit

    LEE, C.O., ET AL, 1960, THE GRAND ISLE MINE: MINING ENGINEERING, V. 12, P. 1578-1590.

  • Other Database

    CIMRI

General comments

Subject category Comment text
Deposit DEPTH TO CAP ROCK 1773 FT. DEPTH TO SALT 2062 FT. SALT VOLUME 4.7 CU MI TO 10,000 FT DEPTH. DEPTH TO SULFUR 1800 TO 2500 FT, SULFUR ZONE 220 TO 425 FT THICK. AVERAGE SULFUR GRADES PER HOLE RANGE FROM 15 TO 30% S.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1992 Long, Keith R. U.S. Geological Survey

Beyond USGS

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

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