|
Mine
|
County
|
|
M & E Mine
|
Clear Creek
|
|
M & M Tunnel
|
Clear Creek
|
|
M & W Mine
|
Saguache
|
|
M L # 23 - 2
|
Montrose
|
|
M. and N. Fraction
|
Lake
|
|
M. G. M.
|
Chaffee
|
|
M. G. Mine
|
Rio Blanco
|
|
M. J. Group
|
Pitkin
|
|
Mable Lode Group Tunnels
|
Hinsdale
|
|
Mac Bob
|
Park
|
|
Mac Donald Property
|
Clear Creek
|
|
Mac Pherson Drilling
|
Montrose
|
|
Mackeen Claims No. 1, 2, 3
|
Chaffee
|
|
MacKenzie Mine
|
Boulder
|
|
Mackey
|
Clear Creek
|
|
Mackey
|
Gilpin
|
|
Mackey 444
|
Gilpin
|
|
Macky
|
Boulder
|
|
Macotte Tunnel
|
Park
|
|
Madeline Mine
|
Boulder
|
|
Madison Mine
|
Clear Creek
|
|
Madonna
|
Jefferson
|
|
Madonna Mine
|
Chaffee
|
|
Madonna Mining
|
Fremont
|
|
Madredoro Mine
|
Boulder
|
|
Maggie C
|
Montrose
|
|
Maggie Mine
|
Boulder
|
|
Maggie Perry
|
Teller
|
|
Magie U. Drilling
|
Montrose
|
|
Magnet
|
Ouray
|
|
Magnolia Gold Mining Company
|
Teller
|
|
Magnolia Mine and Mill
|
Park
|
|
Magpie Group
|
San Miguel
|
|
Mahala Mine
|
Lake
|
|
Maid of Orleans
|
Summit
|
|
Maine - Ouray Mining Company
|
Ouray
|
|
Maine Mine No. 2
|
Custer
|
|
Maitland No. 2
|
Huerfano
|
|
Mal Pais Group
|
Montrose
|
|
Malachite Mine
|
Jefferson
|
|
Mammoth Gold Mining & Reduction Company
|
Gunnison
|
|
Mammoth Group
|
Gunnison
|
|
Mammoth Mine
|
Conejos
|
|
Mammoth Mine
|
Gilpin
|
|
Mammoth Mine
|
Lake
|
|
Mammoth Mine
|
Mesa
|
|
Mammoth Mine
|
San Miguel
|
|
Mammoth Mine & Development
|
Mineral
|
|
Mammoth Mine & Mill
|
Boulder
|
|
Mammoth Tunnel
|
San Juan
|
|
Mammoth Virginia Mining
|
Clear Creek
|
|
Mammouth Mine
|
Rio Grande
|
|
Manchester Tungsten Company
|
Gilpin
|
|
Mancos Canyon Gold Incorporated
|
Montezuma
|
|
Mancos Gold Mining Company
|
Montezuma
|
|
Mande
|
Montrose
|
|
Mandy May Milling & Mining Company
|
Eagle
|
|
Manerva
|
Summit
|
|
Mangusson Tunnel
|
Mineral
|
|
Manhattan Leasing Company
|
Mineral
|
|
Manito
|
Park
|
|
Manito Mines
|
Saguache
|
|
Manitou Dam
|
El Paso
|
|
Manitou Gold Mining & Milling Company
|
Chaffee
|
|
Manitou Mine
|
Teller
|
|
Mann No. 1
|
Jefferson
|
|
Manyana Mining & Leasing Company
|
Teller
|
|
Manyon Lease
|
Boulder
|
|
Maple Leaf Mine
|
Gunnison
|
|
March Oil Shale Company
|
Garfield
|
|
Marchmont Mines Company
|
Jefferson
|
|
Marcy - Shenandoah Incorporated
|
La Plata
|
|
Mardi
|
San Miguel
|
|
Margaret
|
Chaffee
|
|
Margaret B. Mine
|
Teller
|
|
Margaret Glenen Mine & Mill
|
Gilpin
|
|
Margie
|
Montrose
|
|
Marguerite M
|
Teller
|
|
Marguerite Mine
|
Clear Creek
|
|
Marie
|
San Miguel
|
|
Marine Lode
|
Saguache
|
|
Marion Mines & Mills Company
|
Custer
|
|
Marion Mining & Development
|
Chaffee
|
|
Mariposa Group
|
Gunnison
|
|
Mariposa Shaft
|
Teller
|
|
Marjorie Ann
|
Montrose
|
|
Mark K Mine
|
Custer
|
|
Marko Stanlin Lease
|
Dolores
|
|
Marmac Mine
|
San Juan
|
|
Marne
|
San Miguel
|
|
Marqeuis Tungsten Mining Company
|
Boulder
|
|
Marquette Mining
|
Gilpin
|
|
Marr Strip No. 1
|
Jackson
|
|
Marry McKinney Mine
|
Teller
|
|
Mars
|
La Plata
|
|
Marshall - Russell Group
|
Clear Creek
|
|
Marshall Tunnel
|
Clear Creek
|
|
Martha Belle
|
Montrose
|
|
Martha Jane
|
Clear Creek
|
|
Martin
|
Summit
|
|
Martin Group
|
San Juan
|
|
Martin Luther
|
Gilpin
|
|
Martin Mesa
|
Montrose
|
|
Martin Mine
|
Pitkin
|
|
Martin, E. R.
|
Montrose
|
|
Martinette Mining Company
|
Summit
|
|
Martinez
|
Las Animas
|
|
Mary A. Claims
|
Chaffee
|
|
Mary Alice
|
La Plata
|
|
Mary Ann
|
Montrose
|
|
Mary B
|
Park
|
|
Mary B Mine
|
Clear Creek
|
|
Mary B. Mine
|
Pitkin
|
|
Mary Cashin Mine
|
Teller
|
|
Mary Christine Shaft
|
Custer
|
|
Mary Ettie
|
Clear Creek
|
|
Mary Florence Mine
|
Grand
|
|
Mary Goldfield
|
Gilpin
|
|
Mary Jane
|
Lake
|
|
Mary Jane
|
San Miguel
|
|
Mary L No. 1
|
Fremont
|
|
Mary Miller Mine
|
Gilpin
|
|
Mary Mine
|
Boulder
|
|
Mary Murphy Mine
|
Chaffee
|
|
Mary Nelson Mine
|
Boulder
|
|
Mary Nevin Mine
|
Teller
|
|
Mary Olive Mine
|
Boulder
|
|
Mary Tunnel
|
Clear Creek
|
|
Mary V. Mine
|
Boulder
|
|
Maryana Mining & Leasing Company
|
Teller
|
|
Maryland Mine
|
Gilpin
|
|
Mason Mine
|
Gilpin
|
|
Mason Mine
|
La Plata
|
|
Mastedon Group
|
La Plata
|
|
Master Key Mine
|
Routt
|
|
Master Key Mine & Tunnel
|
Gilpin
|
|
Masterpiece Mines Company
|
Teller
|
|
Matchless
|
Mesa
|
|
Matchless Mine
|
Gunnison
|
|
Matchless Mine
|
Lake
|
|
Matchless Tungsten Mining Company
|
Boulder
|
|
Mathilda
|
Summit
|
|
Matilda Mine
|
Chaffee
|
|
Matoa Gold Mining Company
|
Teller
|
|
Matrix Mine
|
Clear Creek
|
|
Mattie Jack Mine
|
Clear Creek
|
|
Mattie L. Mining Company
|
Teller
|
|
Mattie Mine
|
Clear Creek
|
|
Mattie Monroe Mine
|
Summit
|
|
Maud Monroe
|
Clear Creek
|
|
Maud S
|
Boulder
|
|
Maude Mine
|
San Juan
|
|
Maverick #6
|
Mesa
|
|
Maverick Mine
|
Custer
|
|
MAW
|
Mesa
|
|
Maxine Elliott
|
Custer
|
|
Maxwell Mine
|
Las Animas
|
|
May B Mine
|
Teller
|
|
May Belle Mine
|
Boulder
|
|
May Day
|
San Miguel
|
|
May Day
|
Mesa
|
|
May Day - Dumont
|
Clear Creek
|
|
May Day - Idaho Springs
|
Clear Creek
|
|
May Day Mine
|
La Plata
|
|
May Day Mine
|
San Juan
|
|
May McGinnis Mine
|
Saguache
|
|
May Mine
|
Boulder
|
|
May Queen
|
Gunnison
|
|
May Queen Mine
|
Boulder
|
|
May Queen Mine
|
Clear Creek
|
|
May Queen Mine
|
Lake
|
|
May Queen Mine
|
Park
|
|
May Queen Mine
|
Teller
|
|
May Ross Group
|
La Plata
|
|
Maybe
|
Montrose
|
|
Maybell Mine
|
San Juan
|
|
Mayflower & Lafayette
|
Clear Creek
|
|
Mayflower Group
|
Ouray
|
|
Mayflower Mine
|
Chaffee
|
|
Mayflower Mine
|
San Juan
|
|
Mayflower Tunnel
|
Lake
|
|
Mazda Tungsten Manufacturing Company
|
Boulder
|
|
Mazzeppa
|
San Juan
|
|
McCallister Mine
|
Gilpin
|
|
McCartney Group
|
La Plata
|
|
McClane Canyon
|
Garfield
|
|
McClellan
|
Clear Creek
|
|
McClelland Tunnel
|
Clear Creek
|
|
McCluskey, Cooks, & Panasa
|
San Miguel
|
|
McConochie Shaft
|
Teller
|
|
McCreer Mine
|
Gilpin
|
|
McCullough Tunnel
|
Summit
|
|
McDaniel
|
Eagle
|
|
McDonald Gold Mining & Milling Company
|
Boulder
|
|
McGinley
|
Mesa
|
|
McIntosh Mine
|
Gilpin
|
|
McIntyre Mining
|
Dolores
|
|
McPherson Drilling
|
San Miguel
|
|
McPherson Drilling Company
|
Gunnison
|
|
McPherson Drilling Company
|
Lake
|
|
McRea Leasing Company
|
Lake
|
|
Meadow Mountain Mining Company
|
Gunnison
|
|
Meadows Strip #1
|
Routt
|
|
Mears & Wilfley
|
San Juan
|
|
Mears, Slattery & Pitcher
|
San Juan
|
|
Meda Manufacturing Company
|
Boulder
|
|
Media
|
Montrose
|
|
Mediterranean
|
Dolores
|
|
Medley & Lizar
|
Mineral
|
|
Meek Tunnel
|
Montrose
|
|
Meeker Mine
|
Gilpin
|
|
Mehos & Trefone No. 3 Tunnel
|
Chaffee
|
|
Meldrum Group
|
Ouray
|
|
Melissa Mining & Milling Company
|
Boulder
|
|
Melrose Mine & Mill
|
Gunnison
|
|
Melvina
|
Summit
|
|
Melvina Mine
|
Boulder
|
|
Memphis Mine
|
Ouray
|
|
Memphis Mine
|
Saguache
|
|
Mena
|
Jefferson
|
|
Mendic Mine
|
Clear Creek
|
|
Mendota Mine
|
Clear Creek
|
|
Mercury Alpine
|
Saguache
|
|
Merger Company
|
San Juan
|
|
Merical Exploration Company Incorporated
|
Park
|
|
Merry Widow
|
Montrose
|
|
Mesa
|
Montrose
|
|
Mesa #1 & 2
|
San Miguel
|
|
Mesa Creek Mine & Mill
|
Mesa
|
|
Mesa No. 1, 2, 5, 8
|
Mesa
|
|
Metal & Thermit Corporation
|
Mesa
|
|
Metal Exploration Company
|
Dolores
|
|
Metallic Gold Mining Company
|
Teller
|
|
Meteor Mine
|
Clear Creek
|
|
Metropolitan - Furstenberg
|
Clear Creek
|
|
Metropolitan Mine
|
Clear Creek
|
|
Metz Mine
|
Park
|
|
Mexico
|
San Miguel
|
|
Miami Mining & Milling Company
|
Mineral
|
|
Miami Pineshade Mine
|
Boulder
|
|
Mic C
|
Montrose
|
|
Mica Products Company
|
Denver
|
|
Micawber
|
Gunnison
|
|
Micawber
|
Gunnison
|
|
Michigan Mine
|
Summit
|
|
Mickey Breen
|
Ouray
|
|
Microcosm Tunnel
|
Rio Grande
|
|
Mid Colorado Mines
|
Gilpin
|
|
Midas Exploration Company
|
Lake
|
|
Middle Creek
|
Routt
|
|
Middle Hawk #2
|
San Miguel
|
|
Middlesex Mining & Milling Company
|
Summit
|
|
Midget Mine
|
Teller
|
|
Midget Mine
|
Jackson
|
|
Midland Chief Mining
|
Clear Creek
|
|
Midnight
|
Rio Blanco
|
|
Midnight
|
Rio Blanco
|
|
Midnight Mine
|
Pitkin
|
|
Midnight Mine
|
San Miguel
|
|
Midway Gold Mining Company
|
Teller
|
|
Midwest
|
Mineral
|
|
Mid-West Co.
|
Summit
|
|
Mighty Monarch
|
San Juan
|
|
Mikado Mine
|
Lake
|
|
Mike's Adit
|
Boulder
|
|
Mike's Strike
|
San Juan
|
|
Milan Mine
|
Boulder
|
|
Milbob
|
Saguache
|
|
Mildred Gold Mine Company
|
Summit
|
|
Mile High
|
Boulder
|
|
Mill #1, #2, #4
|
Montrose
|
|
Mill Gulch Mine
|
Park
|
|
Mill Tailings Dump
|
Fremont
|
|
Millasier Mining Corporation
|
Teller
|
|
Miller & Son
|
Park
|
|
Miller and Oram
|
Gunnison
|
|
Miller Gold Mining, Milling & Tunnel Company
|
Lake
|
|
Miller Milling & Mines Company
|
Teller
|
|
Miller Tunnel
|
Clear Creek
|
|
Millie G No. 1
|
Lake
|
|
Millington Mine
|
Clear Creek
|
|
Mills Group
|
Montezuma
|
|
Milwaukee Mine
|
Boulder
|
|
Milwaukee Tunnel & Mining Company
|
Dolores
|
|
Minday
|
Teller
|
|
Mine Flower Mine
|
Summit
|
|
Miner Boy
|
Lake
|
|
Mineral Channel Group
|
Mesa
|
|
Mineral Chief
|
Clear Creek
|
|
MIneral Extension
|
Clear Creek
|
|
Mineral Farm Mine
|
Ouray
|
|
Mineral Hill
|
Summit
|
|
Mineral Joe #1 - #12
|
Montrose
|
|
Mineral Lease #31
|
Mesa
|
|
Mineral Mountain Mine
|
San Miguel
|
|
Mineral Park #2, #4, #5
|
Montrose
|
|
Mineral Park Mine
|
Park
|
|
Mineral Point Mine
|
San Juan
|
|
Minerals Engineering Company
|
Gunnison
|
|
Minerals Engineering Company
|
Mesa
|
|
Minerals Management
|
San Miguel
|
|
Minerals Production Company
|
San Juan
|
|
Minerals Recovery Company
|
Denver
|
|
Minerva
|
Summit
|
|
Mines & Securities Company
|
Gunnison
|
|
Minneapolis Mine
|
Boulder
|
|
Minnehaha
|
San Juan
|
|
Minnesota Gold Mining & Tunnel Company
|
Clear Creek
|
|
Minnesota Group
|
Grand
|
|
Minnesota Mine
|
Gilpin
|
|
Minnie
|
Summit
|
|
Minnie B Mine
|
Summit
|
|
Minnie B. Mine
|
Ouray
|
|
Minnie D
|
Routt
|
|
Minnie Foy Mine
|
Boulder
|
|
Minnie Lee Mine
|
Hinsdale
|
|
Minnie Mine
|
Clear Creek
|
|
Mint Mine
|
Clear Creek
|
|
Miramonte Reservoir Dam
|
San Miguel
|
|
Miscellaneous "B"
|
Delta
|
|
Miscellaneous "C"
|
Delta
|
|
Miscellaneous "D"
|
Summit
|
|
Miscellaneous "F"
|
Delta
|
|
Miscellaneous "H"
|
Delta
|
|
Miscellaneous "I"
|
Saguache
|
|
Miscellaneous "K"
|
Delta
|
|
Miscellaneous "O"
|
Saguache
|
|
Miscellaneous "Q"
|
Summit
|
|
Miscellaneous "S"
|
Delta
|
|
Miscellaneous "S"
|
Park
|
|
Miscellaneous "S"
|
Routt
|
|
Miscellaneous "T"
|
Routt
|
|
Miscellaneous "U"
|
San Miguel
|
|
Miscellaneous "Y"
|
San Miguel
|
|
Miscellaneous Coal
|
Garfield
|
|
Miscellaneous Oil Shale
|
Mesa
|
|
Miser Tunnel
|
Rio Grande
|
|
Miss Dividends Mine
|
Clear Creek
|
|
Missing Link Mine
|
Boulder
|
|
Missionary Tunnel
|
Rio Grande
|
|
Missoula Mine
|
Boulder
|
|
Missouri Mine
|
Park
|
|
Missouri Consolidated Mining Company
|
Gilpin
|
|
Missouri Girl Mine
|
Mesa
|
|
Missouri Mine
|
Summit
|
|
Mistletoe Mine
|
Gilpin
|
|
Mitchell Drilling Company
|
Mesa
|
|
Mitchell Mine
|
Gilpin
|
|
Mitchell Mine
|
Summit
|
|
Mix Mine
|
Clear Creek
|
|
Mocking Bird
|
Gilpin
|
|
Modena Mine
|
San Miguel
|
|
Modene Group
|
Montrose
|
|
Modern "Gold of Ophir" Mining Company
|
Montrose
|
|
Modern Ore Reduction Company
|
Boulder
|
|
Modoc Mine
|
Lake
|
|
Modoc Mine
|
Teller
|
|
Moffat Tunnel
|
Grand
|
|
Moffat Tunnel
|
Teller
|
|
Moffat Tunnel
|
Teller
|
|
Mogul
|
San Juan
|
|
Mogul Mill Tailings
|
San Juan
|
|
Mogul Mining Company
|
San Juan
|
|
Mogul Tunnel
|
Boulder
|
|
Mohawk
|
Gunnison
|
|
Mohawk
|
San Juan
|
|
Mohawk
|
Summit
|
|
Molas Mine
|
San Juan
|
|
Mollie B Mine
|
Summit
|
|
Mollie Bawn Mine
|
Clear Creek
|
|
Mollie Gibson Dump
|
Pitkin
|
|
Mollie S Mine
|
Mineral
|
|
Molly Kathleen Mine
|
Teller
|
|
Moltke Mine
|
Boulder
|
|
Moly Mine & Mill
|
Fremont
|
|
Molybdenum Production Corporation
|
Summit
|
|
Mona
|
Larimer
|
|
Monarch
|
La Plata
|
|
Monarch
|
Ouray
|
|
Monarch - Badger
|
Summit
|
|
Monarch & Anglo Saxon
|
San Juan
|
|
Monarch Gold Mining Company
|
La Plata
|
|
Monarch Mine
|
Gilpin
|
|
Monarch Mine
|
Lake
|
|
Monarch Mine
|
San Juan
|
|
Monarch Pool Mining Company
|
Chaffee
|
|
Monarch Shale Oil
|
Garfield
|
|
Monarch Tunnel & Development Company
|
Chaffee
|
|
Monitor Mine
|
Gunnison
|
|
Mono - Ajax
|
Hinsdale
|
|
Monogram Group
|
Montrose
|
|
Monomouth Mining & Leasing
|
Gunnison
|
|
Monon Mine
|
Mineral
|
|
Monon Mine
|
Saguache
|
|
Monster
|
Montrose
|
|
Montana Mine
|
Gilpin
|
|
Monte Carlo
|
Gunnison
|
|
Monte Cristo
|
Clear Creek
|
|
Monte Cristo Mine
|
Summit
|
|
Monte Cristo Shaft
|
Ouray
|
|
Monte Cristo Tunnel
|
Teller
|
|
Monte Queen
|
Hinsdale
|
|
Montezuma - Gold Reef Group
|
La Plata
|
|
Montezuma Mine
|
Boulder
|
|
Montezuma Mine
|
Pitkin
|
|
Montezuma Mines & Mills
|
Summit
|
|
Montezuma Valley Irrigation
|
Montezuma
|
|
Montezuma, Silver Lead Mining Company
|
Summit
|
|
Montgomery Dam
|
Park
|
|
Montgomery Shaft
|
Teller
|
|
Monticello Mines Company
|
San Miguel
|
|
Montreal Gold Mining & Milling Company
|
Teller
|
|
Montrose Gold Mining Company
|
Teller
|
|
Monument
|
Ouray
|
|
Moon Anchor Mine
|
Teller
|
|
Moore
|
Gilpin
|
|
Moore Mining, Milling & Development Company
|
Boulder
|
|
Moose
|
