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Iron Dike

Occurrence in Larimer county in Colorado, United States with commodities Iron, Titanium, Metal
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  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. Land status
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10013978
MRDS ID D010558
Record type Site
Current site name Iron Dike

Geographic coordinates

Geographic coordinates: -105.6956, 40.39359 (WGS84)
Elevation 3487
Location accuracy 500(meters)
Relative position 10 MILES N83W FROM ESTES PARK

Site location context

Political divisions (FIPS codes)

Larimer(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Trail Ridge(quadrangle 1:24,000 scale)

Estes Park(quadrangle 1:100,000 scale)

Greeley(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Big Thompson(hydrologic unit)

South Platte(hydrologic accounting unit)

South Platte(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Rocky Mountain National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State County
United States Colorado Larimer
United States Colorado Boulder

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 006N;005N;004N;004N 075W;074W;074W;073W 10,14,15,23,25,26,36;05,06,08,16,21,22,25,26,27,36;01;21,28,34 Colorado

Comments on the location information

  • DIKE IS NEARLY CONTINUOUS FROM NW TO SE THROUGH SW LARIMER COUNTY AND WEST-CENTRAL BOULDER COUNTY. TOWNSHIPS LISTED ABOVE ARE ALL LARIME R COUNTY. IN BOULDER COUNTY, DIKE EXTENDS THROUGH T3N, R73W; T2N, R72W ; T1N, R72W; AND T1S, R71W. WAHLSTROM EXAMINED EXPOSURES ON FALL RIVER SOUTH OF MOUNT CHAPIN (APPROX SEC. 05, T5N, R74W) AND ON TRAIL RIDGE ROAD. ELEV AND LAT-LONG GIVEN ARE FOR RANGER STATION ON TRAIL RIDGE RO AD IN APPROX SW SEC. 16, T5N, R74W. ; INFO FROM LAND.ST :1977

Commodities

Commodity Importance
Iron Tertiary
Titanium, Metal Critical Tertiary

Materials information

Materials Type of material
Apatite Gangue
Augite Gangue
Biotite Gangue
Labradorite Gangue
Limonite Gangue
Quartz Gangue
Sillimanite Gangue

Alteration

  • (Local) Sericitization Of Plagioclase In Wallrock; Chloritization Of Pyrox Ene; Limonite Replacement Of Augite And Chlorite

Analytical data

Result ANALYSIS OF AUGITE FROM TRAIL RIDGE EXPOSURE SHOWED 49.23% SIO2, 0 .35% TIO2, 5.73% AL203, 1.02% FE203, 14.70% FEO, 0.30% MNO, 11.90% MGO , 14.89% CAO, 0.92% NA20, 0.66% K20, 0.19% P205. ANALYSIS OF FRESH DIA BASE AT CONTACT WITH GRANITE SHOWED 48.71% SIO2, 0.74% TIO2, 16.47% AL 203, 2.90% FE203, 12.01% FEO, 0.19% MNO, 4.47% MGO, 7.85% CAO, 4.60% N A20, 1.17% K20, 0.53% P205, 0.78% H20.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Rock unit name Diabase Dike;Silver Plume Granite
    Rock description Diabase Dike;Silver Plume Granite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Rock unit name Diabase Dike;Metasedimentary Rocks Undivided
    Rock description Diabase Dike;Metasedimentary Rocks Undivided

Nearby scientific data

(1) -105.6956, 40.39359
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Front Range Uplift, Silver Plume Batholith, Boulder Creek Batholith
Type of structure Local
Structure description Nw-Trending Faults

Ore body information

  • General form TABULAR
    Thickness 30.48M
    Length 61153.4M

Controls for ore emplacement

  • Nw-Trending Fault

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Trail Ridge Area

Land status

Ownership category National Park

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit DIABASE DIKE CONTAINING FE-RICH MINERALS AND LIMONITE-STAINED WEA THERING PRODUCTS TRENDS GENERALLY N30W, 60 TO 80 SW, PARALLEL TO ARE A BRECCIA REEFS, CHARACTERISTICALLY 50 TO 100 FT WIDE BUT IN PLACES ONL Y A FEW FEET OR INCHES, INTERSECTED AND OFFSET BY NUMEROUS EAST-WEST-T RENDING FAULTS, SOME OF WHICH HAVE LOCALIZED W MINERALS AND TELLURIDES SUCH AS IN BOULDER CO. GRAIN SIZE INCREASES INWARD FROM CHILLED WALL R OCK CONTACTS. AVERAGE MODAL COMPOSITION (VOL%): 49.8% LABRADORITE, 38. 4% AUGITE, 8.5% TITANIFEROUS MAGNETITE, 2.3% QUARTZ, 1.0% ORTHO CLASE. TITANIFEROUS MAGNETITE OCCURS AS EQUANT CRYSTALS, PLATES, SKELETAL DE NDRITIC CRYSTALS AND IN VEINS FILLING FRACTURES IN PYROXENE AND PLAGIO CLASE. DIKE PREVIOUSLY THOUGHT TO BE LARAMIDE IN AGE AND CORRELATED WI TH OTHER MAFIC INTRUSIVES IN AREA, BUT WAHLSTROM'S CHEMICAL ANALYSES S HOWED DIFFERENCES THAT SUGGEST IT FORMED SEPARATELY; STATE GEOLOGIC MA P SHOWS DIKE TO BE PREC Y AGE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1983 Schwochow, Stephen D. Colorado Geological Survey

Beyond USGS

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

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.