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  3. Mineral Resource Data System (MRDS)

Irma Mine

Past Producer in Montgomery county in Maryland, United States with commodity Gold
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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. Host and associated rocks
  8. Nearby scientific data
  9. Geologic structures
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. Reporter information

Geologic information

Identification information

Deposit ID 10068006
MRDS ID W000910
Record type Site
Current site name Irma Mine

Geographic coordinates

Geographic coordinates: -77.20135, 38.98586 (WGS84)
Elevation 76
Relative position 0.7 MI NW OF CARDEROCK

Site location context

Political divisions (FIPS codes)

Montgomery(county)

Maryland(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Falls Church(quadrangle 1:24,000 scale)

Washington West(quadrangle 1:100,000 scale)

Washington(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Potomac-Catoctin(hydrologic unit)

Potomac(hydrologic accounting unit)

Potomac(hydrologic subregion)

Mid Atlantic(hydrologic region)

Geographic areas

Country State County
United States Maryland Montgomery

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Quartz Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -77.20135, 38.98586
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Reg.Trends: Northeast-Southwest

Ore body information

  • General form LINEAR

Comments on the geologic information

  • GEOL.DESC: THE VEIN IN THIS AREA IS QUITE IRREGULAR. AT NORTH END STRIKE IS N 60 DEG E WITH DIP OF 50-60 DEG. SE. AT SOUTH END STRIKE IS N 4 DEG W - VERTICAL DIP

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Comments on the production information

  • PRODUCTION FIGURES NOT AVAILABLE. WHEN PRODUCED THE ORE YIELDED ABOUT $10. PER TON

Workings at the site

  • Type of workings Underground
    Length 30.48M
    Overall depth 15.24M

Comments on development

  • IN 1890 THE MINE HAD A 10 STAMP MILL

Reference information

Bibliographic references

  • Deposit

    EMMONS, S.F., 1890, TRANS. AIME, V. 18, P. 401, 403-404

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1972 Wright, Nancy A. U.S. Geological Survey

Beyond USGS

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

Maps centered on this site