Mine

County

Notes

1905

Boulder

1-F Tunnel

Moffat

45 - 90

Montezuma

5 Mine

Boulder

A & B Mining Company

Clear Creek

Miscellaneous "A"

A & H

Montrose

Miscellaneous "A"

A. B. G.

Dolores

Miscellaneous "A"

A. C. A. Mine

Clear Creek

A. E. C.

San Juan

A. E. C.

San Juan

A. L. & M. Mine

Boulder

Miscellaneous "A"

A. L. Bradford

San Miguel

Miscellaneous "B"

A. P. Tunnel

Clear Creek

A. V. Shaft

Lake

A. V. Slag Dump

Lake

A. Y. & Minnie Mine

Lake

Aaberite

Gunnison

Miscellaneous "A"

Abandon Shaft

Custer

Abe Lincoln

Teller

Ace in the Hole Mine

Gilpin

Miscellaneous A

Acme Mine

Boulder

Acme Uranium Mill

San Miguel

Miscellaneous "A"

Acme Uranium Mill

Summit

Miscellaneous "A"

Aco Mining Company

Summit

Ada Bell Mine

Teller

Adak

Montrose

Adams

San Juan

Miscellaneous "A"

Adams Shaft

Lake

Adelaide Mine

Lake

Adeline & Corydon

Gilpin

Adna Group

Clear Creek

Miscellaneous "A"

Aetna Mine

Gilpin

After Dinner & Perseverance

Gilpin

Agnes Mine

Teller

Miscellaneous "A"

Aguilar Imperial

Las Animas

Air Academy Tunnel

El Paso

Miscellaneous "A"

Ajax - Cave - Lucky Day

Mesa

Miscellaneous "A"

Ajax #2 Tunnel

Hinsdale

Ajax & Canyon Portals

Mesa

Miscellaneous "A"

Ajax Mine

Clear Creek

Ajax Mine

Mesa

Miscellaneous "A"

Ajax Mine

Teller

Ajax Mine

Teller

Miscellaneous "A"

Akers & Kunz

San Juan

Miscellaneous "A"

Akin Tunnel

Custer

Akney Copper Mining Company

Larimer

Akron Mine

Gunnison

Aksarben Mine

Chaffee

Al

San Miguel

Miscellaneous "A"

Ala Makee Mine

Boulder

Miscellaneous "A"

Aladdin Gold Mining Company

Lake

Miscellaneous A

Alamo Mines Company

Teller

Miscellaneous "A"

Alaska & Yukon

Saguache

Miscellaneous "A"

Alaska Mine

Gilpin

Alaska Tunnel

Boulder

Albers Mine

Ouray

Miscellaneous "A"

Albert Beacon Gold Mining Company

Teller

Miscellaneous "A"

Albert Lea Tungsten Mining & Milling Company

Boulder

Miscellaneous "A"

Albert Tunnel

Gilpin

Miscellaneous A

Albro Mine

Clear Creek

Alcante District

Lake

Miscellaneous A

Alcoa Shaft

Jackson

Miscellaneous "A"

Alexander Mine

Clear Creek

Alhambra #2

Gunnison

Miscellaneous "A"

Alhambra Mine

Teller

Alhambra Tunnel

Boulder

Alice

Gilpin

Miscellaneous A

Alice

San Miguel

Alice Blue Gown

Summit

Alice Mine

Boulder

Alice MIne

Clear Creek

Alice Mine

Custer

Alice Mine

Teller

Miscellaneous "A"

Alie Bell Mine

Chaffee

Alke

Montrose

Miscellaneous "A"

All Right Shaft

Lake

All Star

Montrose

Allard Beryllium Mine

Chaffee

Miscellaneous "A"

Allard Mining Company

La Plata

Allegany Shaft

Lake

Miscellaneous A

Allegheny Mine

San Miguel

Allen Emery

Summit

Allen Mine

Las Animas

Allen Park Power & Mining Company

Boulder

Miscellaneous "A"

Allgrove Mining & Milling Company

Boulder

Alliance Gold Mining Company

Teller

Miscellaneous "A"

Alliance Mine

Summit

Allie Mine

Gilpin

Miscellaneous A

Allied Gold Mining Company

Boulder

Allied Metals Corporation

Denver

Miscellaneous "A"

Alligator Tunnel

Eagle

Miscellaneous "A"

Allison Drilling Company

San Miguel

Miscellaneous "A"

Alllison Drilling Company

Dolores

Miscellaneous "A"

Alma

Ouray

Alma Lincoln

Clear Creek

Alma P. M. & S. Company

Ouray

Almaden Mine

Clear Creek

Aloha Gold Mining Company

Teller

Alpha Gold & Silver Mining Company

Gilpin

Miscellaneous A

Alphidor Mining & Refining Company

San Juan

Miscellaneous "A"

Alpine Horn Mine

Boulder

Alpine Mine

Park

Miscellaneous "A"

Alpine Mine

Pitkin

Miscellaneous "A"

Alpine Mine

Routt

Miscellaneous "A"

Alpine Mine

Saguache

Miscellaneous "A"

Alpine Tunnel

Eagle

Alpine Tunnel

Lake

Miscellaneous A

Alps Consolidated Mining Company

Lake

Miscellaneous A

Alps Group

Gilpin

Miscellaneous A

Alsa R. Shaft

Teller

Miscellaneous "A"

Alta - St. Louis Mine

San Miguel

Alta Group

Montrose

Alta Mines Leasing Company

San Juan

Miscellaneous "A"

Alter & Walcott

Teller

Miscellaneous "A"

Altoona

Ouray

Alturas Shale Oil Company

Garfield

Amanda Mine

Teller

Amazon

Gunnison

Miscellaneous "A"

America

Dolores

Miscellaneous "A"

American

Lake

American Eagle

Montrose

American Eagle

Summit

Miscellaneous "A"

American Eagle Mine

San Miguel

Miscellaneous "A"

American Eagles Mine

Teller

American Fluorspar

Chaffee

American Frenchman Tunnel

San Miguel

Miscellaneous "A"

American Girl

Gilpin

American Gold & Platinum Company

Boulder

American Gold Mining

Ouray

American Leduc

Mesa

Miscellaneous "A"

American Metals of Colorado

Summit

American Mine

Boulder

Miscellaneous "A"

American Mine

San Miguel

Miscellaneous "A"

American Mine

Summit

Miscellaneous "A"

American Mine and Mill

Park

American Mine Services

Saguache

Miscellaneous "A"

American Mineral Oil Company

Mesa

Miscell. Oil Shale

American Minerals

La Plata

Miscellaneous "A"

American Mines Development Company

Gilpin

American Mining & Refining Corporation

San Juan

Miscellaneous "A"

American Nettie

Ouray

American Rare Metals Company

San Miguel

Miscellaneous "A"

American Resource Company

San Miguel

Miscellaneous "A"

American Shale Refining

Garfield

American Sisters

Clear Creek

American Smelting & Refining Tunnel

Lake

Miscellaneous A

American Tunnel

San Juan

American Uranium Engineering Company

Mesa

Miscellaneous "A"

Amethyst Queen

Mesa

Amity Mine

Lake

Amy Mining Company

Lake

Miscellaneous A

Amy Paul Mine

Boulder

Anaconda

Eagle

Miscellaneous "A"

Anaconda Mine

Gunnison

Anaconda Mine

Teller

Anamosa

Clear Creek

Miscellaneous "A"

Anaweep Mine

San Miguel

Anchor

Montrose

Anchor Mine

Boulder

Anchor Mine

Gilpin

Anchor Tunnel

Lake

Miscellaneous A

Anchoria Leland Mine

Teller

Anderson and Benkelman

Teller

Andrew & Jackson

San Juan

Miscellaneous "A"

Andrus

San Miguel

Andy Lowe Mine

Clear Creek

Angel Mining Company

Ouray

Miscellaneous "A"

Angeline Lode

Gilpin

Anglo Celt

Gilpin

Miscellaneous A

Anglo Saxon

Clear Creek

Ann Ritiage Mine & Milling Company

Gilpin

Miscellaneous A

Anna B Mine

Clear Creek

Miscellaneous "A"

Anna C & L7

Gilpin

Miscellaneous A

Anna J Shaft

Teller

Anna Lee

Custer

Miscellaneous "A"

Anna May

Montrose

Anna May Wells Mine

Teller

Miscellaneous "A"

Annex Milling & Mines Company

Gilpin

Miscellaneous A

Annex No. 2 Strip

Fremont

Annie

Rio Grande

Miscellaneous "A"

Annie C.

Chaffee

Miscellaneous "A"

Annie D. Lode

Teller

Miscellaneous "A"

Annie H. Mine

Gilpin

Annie Lode

Gilpin

Miscellaneous A

Annie Mine

Eagle

Miscellaneous "A"

Annie Mine

Gilpin

Anoka Lease

Clear Creek

Miscellaneous "A"

Anon

Clear Creek

Antelope Mine

Clear Creek

Antelope Tunnel

Lake

Antero

Chaffee

Miscellaneous "A"

Antlers Gold Mining & Milling Company

Routt

Miscellaneous "A"

Apex

Gilpin

Apex #2

Routt

Apex Copper Company Mine

Park

Miscellaneous "A"

Appel Developing Company

Routt

Miscellaneous "A"

Appel, A. F.

Routt

Miscellaneous "A"

Applejack

Montrose

Miscellaneous "A"

April

Gilpin

Miscellaneous A

April #1

San Miguel

April Fool Leasing Company

Mesa

Miscellaneous "L"

April Fool Leasing Company

Mineral

Miscellaneous "A"

April Mine

San Miguel

Miscellaneous "A"

April No. 1

Montrose

Arapahoe Group

Boulder

Arasta Leasing Company

San Juan

Miscellaneous "A"

Arastra Gulch Mining & Milling Company

Alamosa

Miscellaneous "A"

Arcadia Consolidated Mining Company

Teller

Miscellaneous "A"

Archibald Mine

Park

Miscellaneous "A"

Archibell

Clear Creek

Miscellaneous "A"

Arequa

Teller

Miscellaneous "A"

Argeata Mutual Mines Company

San Miguel

Miscellaneous "A"

Argeata Mutual Mines Company

Summit

Miscellaneous "A"

Argentine Mine

San Miguel

Miscellaneous "A"

Argentine Mine

Summit

Miscellaneous "A"

Argo Mine

Boulder

Argo Mine

Clear Creek

Argo Reduction & Ore Purchasing Company

Gilpin

Miscellaneous A

Argo Tunnel

Clear Creek

Argo Tunnel

Gilpin

Argon Gold Mining & Milling Company

Teller

Miscellaneous "A"

Ariadne

Clear Creek

Miscellaneous "A"

Ariadne Corporation

San Juan

Arkansas Mine

Lake

Miscellaneous A

Army and Navy

Ouray

Aro

Jackson

Aroostook

San Juan

Miscellaneous "A"

Arps Brothers Leasing Company

Ouray

Miscellaneous "A"

Arps Leasing Company

Ouray

Miscellaneous "A"

Arrowhead

Mesa

Arrowhead

Montrose

Arthur Mine

Clear Creek

Miscellaneous "A"

Arthur Mining & Exploration Company

Clear Creek

Miscellaneous "A"

Artic Mine

Summit

Ascension

Jefferson

Ashby Tunnel

Clear Creek

Miscellaneous "A"

Ashland

Clear Creek

Aspen Bi - Metallic

Pitkin

Aspen Concentrator

Pitkin

Aspen Creek Mine

Chaffee

Miscellaneous "A"

Aspen Mine

San Juan

Aspen Sampling Company

Pitkin

Aspen Tunnel

Ouray

Miscellaneous "A"

Athey Group

Montrose

Miscellaneous "A"

Atkinson Mine

Gilpin

Atlanta

Teller

Atlanta Mine

Boulder

Miscellaneous "A"

Atlantic & Rifle Group

Clear Creek

Atlantic Group

San Juan

Miscellaneous "A"

Atlantic Mine

Boulder

Atlantic Mine

Chaffee

Atlantic Mine

Gilpin

Atlantis Mine

Lake

Atlas

Lake

Miscellaneous A

Atlas

Mesa

Miscellaneous "A"

Atlas

San Miguel

Atlas Mine

Clear Creek

Atlas Mine

Ouray

Atomic Energy Commission

Mesa

Miscellaneous "A"

Atomic Energy Commission

Montrose

Auburn

San Juan

Augusta

Gunnison

Augusta

Jefferson

Aurelia Lode

Gilpin

Aurora Rampart Tunnels No. 1 & No. 2

Douglas

Aurum Enterprises Incorporated

Boulder

Miscellaneous "A"

Austin

Mesa

Austria Mine

San Juan

Miscellaneous "A"

Ava Jay

San Miguel

Avoca Virginia Mine

Gunnison

Aztec

Dolores

Miscellaneous "A"

Aztec

Montrose

Aztec Mine

Boulder

Miscellaneous "A"