Jefferson County Iron Mines

The Jefferson County Iron Mines is a iron mine located in Jefferson county, Colorado at an elevation of 7,100 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Jefferson County Iron Mines

Commodity

Primary: Iron

Location

State: Colorado
County: Jefferson
District: Morrison Area

Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1880
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Type: R
Description: Front Range Uplift

Type: L
Description: Bear Creek Shear Zone

Alterations

Not available

Rocks

Name: Schist
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Schist
Role: Host
Age Type: Host Rock Unit
Age Young: Neoproterozoic

Analytical Data

Analytical Data: HIGHER GRADE SAMPLE CONTAINED 20.56% FE AND 0.069%

Materials

Ore: Magnetite

Comments

Comment (Workings): THREE SMALL PROSPECT PITS

Comment (Location): ALONG STRAIN GULCH, 2000 FT ABOVE MOUTH ACCORDING TO HARRER AND TESCH BUT EXACT LOCATION IS UNCERTAIN ; INFO FROM LAND.ST :(1975)

Comment (Development): HARRER AND TESCH CONSIDERED DEPOSIT TO BE NONCOMMERCIAL

Comment (Deposit): HARRER AND TESCH DESCRIBE DEPOSIT AS OCCURRING IN PEGMATITIC AMPHIBOLE SCHIST. GABLE'S MAP AND ROCK-UNIT DESCRIPTIONS SUGGEST THAT FE COULD OCCUR IN ONE OF SEVERAL UNITS AS ACCESSORY MINERAL: MICROCLINE-QUARTZ-PLAGIOCLASE-BIOTITE GNEISS, PEGMATITE, OR CORDIERITE-BEARING BIOTITE GNEISS.

References

Reference (Deposit): HARRER, C.M., AND TESCH, W.J., JR., 1959, RECONNAISSANCE OF IRON OCCURRENCES IN COLORADO: USBM IC 7918, P. 45.

Reference (Deposit): SCOTT, G.R., 1972, GEOLOGIC MAP OF THE MORRISON QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-790-A

Reference (Deposit): GABLE, D.J., 1968, GEOLOGY OF THE CRYSTALLINE ROCKS IN THE WESTERN PART OF THE MORRISON QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS BULL. 1251-E.

Colorado Mining Photos

Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.