Piedra Niegro Claim

The Piedra Niegro Claim is a manganese mine located in Hinsdale county, Colorado at an elevation of 11,138 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: Piedra Niegro Claim
Secondary: Piedra Niegro Mining Claim

Commodity

Primary: Manganese

Location

State: Colorado
County: Hinsdale
District: Finger Mesa Area

Land Status

Land ownership: National Forest
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

Owner Name: J. J. And Jack Sylvester
Years: 1951 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Underground
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: San Juan Volcanic Field

Type: L
Description: Lost Lake Caldera

Alterations

Not available

Rocks

Name: Rhyodacite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene

Name: Rhyodacite
Role: Associated
Age Type: Host Rock
Age Young: Oligocene

Analytical Data

Not available

Materials

Ore: Psilomelane

Comments

Comment (Location): ABOVE (UNVERIFIED) LOCATION TAKEN FROM USBM MILS LISTING. PLOTTED LOCATION LIES AT HEAD OF NORTH CLEAR CREEK 3.2 MILES WSW OF PEARL LAKES AND NEAR DIVIDE BETWEEN NORTH CLEAR CREEK AND LOST TRAIL CREEK. ; INFO FROM LAND.ST :1977

Comment (Deposit): BASED ON THIS UNVERIFIED LOCATION, DEPOSIT LIES IN FISH CANYON TUFF JUST BEYOND NW RIM OF LOST LAKE BURIED CALDERA. NATURE OF MN OCCURRENCE IS UNCERTAIN BUT COULD BE SIMILAR TO OTHERS IN VOLCANIC TERRAINS OF SOUTHERN RUNNISON COUNTY AND NORTHERN HINSDALE COUNTY. THERE, HARD, COMPACT, FINELY GRANULAR, HIGHLY SILICEOUS PSILOMELANE OCCURS AS BOTRYOIDAL MASSES IN POCKETS AND FREQUENTLY IN NETWORK OF SMALL VEINS UP TO FOUR INCHES WIDE, AND IN BRECCIA.

References

Reference (Deposit): LIPMAN, P.W., 1976, GEOLOGIC MAP OF THE LAKE CITY CALDERA AREA, WESTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-962.

Reference (Deposit): MUILENBURG, G.A., 1919, MANGANESE DEPOSITS OF COLORADO: CGS BULL. 15, P. 42-45.

Reference (Deposit): USBM MILS LISTING 0080530075

Reference (Deposit): STEVEN, T.A., AND LIPMAN, P.W., 1976, CALDERAS OF THE SAN JUAN VOLCANIC FIELD, SOUTHWESTERN COLORADO: USGS PROF. PAPER 958, P. 8-10.

Colorado Mining Photos

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