Overholt Lode

City of Creede, Colorado

37.8612°N 106.9310°W

Mine Overview

The Overholt Lode is in City of Creede, Colorado. Historically the site has been associated with the Creed Mining District which is now part of the Rio Grande National Forest. The site was first discovered in 1892. The Overholt Lode was closed at the time of data entry with no known plans to re-open. Production size when active was considered to be small. The ore mined is composed of chalcopyrite with waste material consisting primarily of amethyst and barite. The ore body extends 1 meters (4 feet) wide at a depth of 274 meters (900 feet) below the surface. Associated rock in this area is rhyolite from the Oligocene epoch 33.90 to 23.03 million years ago. The Southern Rocky Mountains physiographic province of the Rocky Mountain System characterize the geomorphology of the surrounding area.

Site identification and general characteristics. Learn about USGS mines.

Gold and Silver Primary Commodity
Copper Secondary Commodity
Antimony Secondary Commodity
Site Record Type^?
Mine Development Status^?
Underground Operation Type^?
1892 Year Discovered^?
Ore Mineral In Place Discovery Method^?
Small Production Size^?
Metallic Site Commodity Type^?
Small Mine Size^?

Overholt Lode In City of Creede, Colorado

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Mine Names

Name^? Status^?
Overholt Lode Current

Commodities

Additional textual information about a site or mine.

Commodity Type Importance
Gold Metallic Primary
Silver Metallic Primary
Copper Metallic Secondary
Antimony Metallic Tertiary

Deposit

ATTITUDE IS FOR FRACTURED, SHEETED ZONE THAT, ON TUNNEL LEVEL, CONTAINS THREE VEINS AT N15E, 35-70 SE.

DISCOVERY YEAR: EARLY 1890'S

Location Info

Mineral , Colorado County / State

Continent Country State County
North America The United States Colorado Mineral

Notes

S-T-R, LAT-LONG, AND ELEV DETERMINED FROM EMMONS AND LARSEN'S (1923) TOPO MAP (1:24, 000 ). MINE OR CLAIM LIES 2047 FEET FROM PORTAL OF NELSON TUNNEL.; INFO FROM LAND. ST : (1976).

Meridian / Township / Range Description

Meridian^? Township^? Section^? Aliquot^?
New Mexico Meridian T.42N R.1W Sec. 24 NE
New Mexico Meridian T.42N R.1W Sec. 24 SW
New Mexico Meridian T.42N R.1W Sec. 36 NE

Land Status

Land status information.

Land Status^? Admin Area^?
National Forest -
Private -

Mining Districts

Formal or informal mining district names.

District
Creed Mining District

Development

LODE DISCOVERED DURING DRIVING OF NELSON TUNNEL AT DISTANCE OF 2047 FEET FROM PORTAL.

Workings

300-FEET LONG RAISE WITH SHORT STOPES AND DRIFTS. SAME VEIN IS APPARENTLY WORKED AT SW END OF OVERHOLT CROSSCUT OFF MCCLURE DRIFT AND CROSSCUT ON COMMODORE 5 LEVEL.

Concentration Process

Processes that concentrated or enriched the mineralization of the mine.

Concentration Process
Pressure From Stock Beneath Bachelor Caldera Reactivated Keystone Graben And Started North-South-Flowing, Freely Convecting Hydrothermal System Of Sulfate-Rich Solutions That Deposited Ore And Gangue Near Top Of Convecting Cell By Hypogene Enrichment Process. Boiling, With Loss Of Acid Constituents, And Resulting Rise In Ph Caused Precipitation Of Ores And Formation Of Intensely Altered Sericitic Cap Above Ore. Cap Is Actually Coalescence Of Alteration Fans Spreading Upward And Outward Thru Fractured And Porous Rock In Main Fault Zones And Along Parallel And Antithetic Fractures In Hanging Wall.

Materials

Minerals or other materials present in the mine.

Role^? Material^?
Gangue/Waste Amethyst
Gangue/Waste Barite
Ore Chalcopyrite

Orebody

Characteristics of the ore body.

Width: 1.52 meters (4.99 feet)
Top Depth: 274.32 meters (900.00 feet)
Bottom Depth: 365.76 meters (1,200.00 feet)
Strike: north 40-45 west
Dip: 70 to 85 southwest

Rocks

Geological materials at the site.

Class^? 1st Order Name^? 2nd Order Name^? 3rd Order Name^? 4th Order Name^? Most Specific Name^? Begin Time End Time Description^?
Associated Rock Campbell Mountain Member Of Bachelor Mountain Rhyolite Volcanic Rock (Aphanitic) Felsic Volcanic Rock Rhyolite Rhyolite Oligocene Oligocene -
Host Rock Campbell Mountain Member Of Bachelor Mountain Rhyolite Volcanic Rock (Aphanitic) Felsic Volcanic Rock Rhyolite Rhyolite - - -
Mineralization - - - - - Miocene Miocene -

Structure

Geologic structural features affecting or characterizing the site or mine.

Scale Description
Local Amethyst Fault Zone; Creede Graben
Regional La Garita, Creede, And Bachelor Calderas; San Juan Volcanic Field

Tectonic

Tectonic setting in which the site or deposit is situated.

Setting^?
Central Cordillera (Southern Rocky Mountains)

Physiography

Physiographic area where the resource is found.

Division Province^? Section
Rocky Mountain System Southern Rocky Mountains -

Alteration

Mineralogical and chemical alteration at or near the site, which may help to indicate the geographic extent of the geological processes producing the mine.

Type^? Alterations
Local Copper Carbonates; Limonite

Analytical Data

Results of chemical or mineralogical analysis on materials at or near the site

Line^? Analysis Data^?
1 39 TO 40 OUNCE PER TON SILVER, $0.60/TON GOLD

Ore Control

Controls on emplacement of ore such as faults or other structural features.

Text^?
Fracture Zone Subparallel To And In Hanging Wall Of Amethyst Fault Zone

Nearby Deposits

Other deposits in the same region.

Nearby Places

Creede (0.06 miles away)
Cathedral (16.32 miles away)
South Fork (19.97 miles away)

Nearby Mining Districts

Creed Mining District (0 miles away)
Bondholder Mining District (6.86 miles away)

Nearby Lands

Rio Grande National Forest (0 miles away)
La Garita Wilderness (3.55 miles away)
Gunnison National Forest (6.33 miles away)

Footnotes

* Mine bounds on map indicate the general area that a mine occupies. For an detailed map, refer to the overseeing BLM field office.

** The mine central point is based on an average of the mine's bounding box(es) and does not necessarily fall on the claim itself.

¹ World-class significance is determined by total endowment of the contained commodity. This includes all past production and remaining reserves. Each commodity is considered separately and commodities cannot be combined to arrive at a significant size. The tonnage thresholds are from the mine model grade-tonnage studies. As of June 2008, many entries were classified as significant under less strict rules.

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