Mine

County

Notes

M & E Mine

Clear Creek

M & M Tunnel

Clear Creek

M & W Mine

Saguache

Miscellaneous "M"

M L # 23 - 2

Montrose

M. and N. Fraction

Lake

Miscellaneous "M"

M. G. M.

Chaffee

Miscellaneous "M"

M. G. Mine

Rio Blanco

Miscellaneous "M"

M. J. Group

Pitkin

Miscellaneous "M"

Mable Lode Group Tunnels

Hinsdale

Miscellaneous "M"

Mac Bob

Park

Miscellaneous "M"

Mac Donald Property

Clear Creek

Miscellaneous "M"

Mac Pherson Drilling

Montrose

Mackeen Claims No. 1, 2, 3

Chaffee

MacKenzie Mine

Boulder

Miscellaneous "M"

Mackey

Clear Creek

Miscellaneous "M"

Mackey

Gilpin

Mackey 444

Gilpin

Macky

Boulder

Miscellaneous "M"

Macotte Tunnel

Park

Madeline Mine

Boulder

Miscellaneous "M"

Madison Mine

Clear Creek

Madonna

Jefferson

Madonna Mine

Chaffee

Madonna Mining

Fremont

Miscellaneous M

Madredoro Mine

Boulder

Miscellaneous "M"

Maggie C

Montrose

Maggie Mine

Boulder

Miscellaneous "M"

Maggie Perry

Teller

Miscellaneous "M"

Magie U. Drilling

Montrose

Miscellaneous "M"

Magnet

Ouray

Magnolia Gold Mining Company

Teller

Miscellaneous "M"

Magnolia Mine and Mill

Park

Magpie Group

San Miguel

Mahala Mine

Lake

Maid of Orleans

Summit

Maine - Ouray Mining Company

Ouray

Miscellaneous "M"

Maine Mine No. 2

Custer

Maitland No. 2

Huerfano

Mal Pais Group

Montrose

Malachite Mine

Jefferson

Mammoth Gold Mining & Reduction Company

Gunnison

Miscellaneous M

Mammoth Group

Gunnison

Miscellaneous M

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

Miscellaneous "M"

Mammoth Virginia Mining

Clear Creek

Mammouth Mine

Rio Grande

Miscellaneous "M"

Manchester Tungsten Company

Gilpin

Mancos Canyon Gold Incorporated

Montezuma

Miscellaneous "M"

Mancos Gold Mining Company

Montezuma

Miscellaneous "M"

Mande

Montrose

Mandy May Milling & Mining Company

Eagle

Miscellaneous "M"

Manerva

Summit

Miscellaneous "M"

Mangusson Tunnel

Mineral

Miscellaneous "M"

Manhattan Leasing Company

Mineral

Miscellaneous "M"

Manito

Park

Miscellaneous "M"

Manito Mines

Saguache

Manitou Dam

El Paso

Miscellaneous "M"

Manitou Gold Mining & Milling Company

Chaffee

Miscellaneous "M"

Manitou Mine

Teller

Miscellaneous "M"

Mann No. 1

Jefferson

Manyana Mining & Leasing Company

Teller

Miscellaneous "M"

Manyon Lease

Boulder

Maple Leaf Mine

Gunnison

March Oil Shale Company

Garfield

Miscellaneous M

Marchmont Mines Company

Jefferson

Miscellaneous M

Marcy - Shenandoah Incorporated

La Plata

Miscellaneous "M"

Mardi

San Miguel

Miscellaneous "M"

Margaret

Chaffee

Miscellaneous "M"

Margaret B. Mine

Teller

Miscellaneous "M"

Margaret Glenen Mine & Mill

Gilpin

Miscellaneous "M"

Margie

Montrose

Marguerite M

Teller

Miscellaneous "M"

Marguerite Mine

Clear Creek

Marie

San Miguel

Marine Lode

Saguache

Marion Mines & Mills Company

Custer

Miscellaneous "M"

Marion Mining & Development

Chaffee

Mariposa Group

Gunnison

Miscellaneous M

Mariposa Shaft

Teller

Marjorie Ann

Montrose

Mark K Mine

Custer

Marko Stanlin Lease

Dolores

Miscellaneous "M"

Marmac Mine

San Juan

Marne

San Miguel

Marqeuis Tungsten Mining Company

Boulder

Miscellaneous "M"

Marquette Mining

Gilpin

Marr Strip No. 1

Jackson

Marry McKinney Mine

Teller

Mars

La Plata

Marshall - Russell Group

Clear Creek

Miscellaneous "M"

Marshall Tunnel

Clear Creek

Martha Belle

Montrose

Martha Jane

Clear Creek

Miscellaneous "M"

Martin

Summit

Miscellaneous "M"

Martin Group

San Juan

Martin Luther

Gilpin

Martin Mesa

Montrose

Miscellaneous "M"

Martin Mine

Pitkin

Martin, E. R.

Montrose

Miscellaneous "M"

Martinette Mining Company

Summit

Miscellaneous "M"

Martinez

Las Animas

Mary A. Claims

Chaffee

Mary Alice

La Plata

Miscellaneous "M"

Mary Ann

Montrose

Mary B

Park

Miscellaneous "M"

Mary B Mine

Clear Creek

Miscellaneous "M"

Mary B. Mine

Pitkin

Mary Cashin Mine

Teller

Mary Christine Shaft

Custer

Miscellaneous "L"

Mary Ettie

Clear Creek

Miscellaneous "M"

Mary Florence Mine

Grand

Mary Goldfield

Gilpin

Miscellaneous "M"

Mary Jane

Lake

Miscellaneous "M"

Mary Jane

San Miguel

Mary L No. 1

Fremont

Mary Miller Mine

Gilpin

Miscellaneous "M"

Mary Mine

Boulder

Miscellaneous "M"

Mary Murphy Mine

Chaffee

Mary Nelson Mine

Boulder

Miscellaneous "M"

Mary Nevin Mine

Teller

Mary Olive Mine

Boulder

Mary Tunnel

Clear Creek

Mary V. Mine

Boulder

Miscellaneous "M"

Maryana Mining & Leasing Company

Teller

Miscellaneous "M"

Maryland Mine

Gilpin

Mason Mine

Gilpin

Miscellaneous "M"

Mason Mine

La Plata

Miscellaneous "M"

Mastedon Group

La Plata

Miscellaneous "M"

Master Key Mine

Routt

Master Key Mine & Tunnel

Gilpin

Miscellaneous "M"

Masterpiece Mines Company

Teller

Matchless

Mesa

Matchless Mine

Gunnison

Matchless Mine

Lake

Matchless Tungsten Mining Company

Boulder

Miscellaneous "M"

Mathilda

Summit

Miscellaneous "M"

Matilda Mine

Chaffee

Matoa Gold Mining Company

Teller

Miscellaneous "M"

Matrix Mine

Clear Creek

Mattie Jack Mine

Clear Creek

Mattie L. Mining Company

Teller

Miscellaneous "M"

Mattie Mine

Clear Creek

Mattie Monroe Mine

Summit

Miscellaneous "M"

Maud Monroe

Clear Creek

Maud S

Boulder

Maude Mine

San Juan

Maverick #6

Mesa

Miscellaneous "M"

Maverick Mine

Custer

MAW

Mesa

Miscellaneous "M"

Maxine Elliott

Custer

Maxwell Mine

Las Animas

May B Mine

Teller

May Belle Mine

Boulder

Miscellaneous "M"

May Day

San Miguel

May Day

Mesa

Miscellaneous "M"

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

Miscellaneous M

May Queen Mine

Boulder

Miscellaneous "M"

May Queen Mine

Clear Creek

Miscellaneous "M"

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

Miscellaneous "M"

Mayflower Group

Ouray

Mayflower Mine

Chaffee

Mayflower Mine

San Juan

Mayflower Tunnel

Lake

Miscellaneous "M"

Mazda Tungsten Manufacturing Company

Boulder

Miscellaneous "M"

Mazzeppa

San Juan

Miscellaneous "M"

McCallister Mine

Gilpin

Miscellaneous "M"

McCartney Group

La Plata

Miscellaneous "M"

McClane Canyon

Garfield

McClellan

Clear Creek

Miscellaneous "M"

McClelland Tunnel

Clear Creek

McCluskey, Cooks, & Panasa

San Miguel

Miscellaneous "C"

McConochie Shaft

Teller

McCreer Mine

Gilpin

McCullough Tunnel

Summit

McDaniel

Eagle

Miscellaneous "M"

McDonald Gold Mining & Milling Company

Boulder

Miscellaneous "M"

McGinley

Mesa

McIntosh Mine

Gilpin

Miscellaneous "M"

McIntyre Mining

Dolores

McPherson Drilling

San Miguel

McPherson Drilling Company

Gunnison

Miscellaneous M

McPherson Drilling Company

Lake

Miscellaneous "M"

McRea Leasing Company

Lake

Miscellaneous "M"

Meadow Mountain Mining Company

Gunnison

Miscellaneous M

Meadows Strip #1

Routt

Mears & Wilfley

San Juan

Miscellaneous "M"

Mears, Slattery & Pitcher

San Juan

Miscellaneous "M"

Meda Manufacturing Company

Boulder

Miscellaneous "M"

Media

Montrose

Mediterranean

Dolores

Miscellaneous "M"

Medley & Lizar

Mineral

Miscellaneous "M"

Meek Tunnel

Montrose

Meeker Mine

Gilpin

Mehos & Trefone No. 3 Tunnel

Chaffee

Miscellaneous "M"

Meldrum Group

Ouray

Miscellaneous "M"

Melissa Mining & Milling Company

Boulder

Miscellaneous "T"

Melrose Mine & Mill

Gunnison

Miscellaneous M

Melvina

Summit

Miscellaneous "M"

Melvina Mine

Boulder

Memphis Mine

Ouray

Miscellaneous "M"

Memphis Mine

Saguache

Mena

Jefferson

Mendic Mine

Clear Creek

Miscellaneous "M"

Mendota Mine

Clear Creek

Mercury Alpine

Saguache

Miscellaneous "M"

Merger Company

San Juan

Merical Exploration Company Incorporated

Park

Miscellaneous "M"

Merry Widow

Montrose

Mesa

Montrose

Mesa #1 & 2

San Miguel

Mesa Creek Mine & Mill

Mesa

Miscellaneous "M"

Mesa No. 1, 2, 5, 8

Mesa

Metal & Thermit Corporation

Mesa

Miscellaneous "M"

Metal Exploration Company

Dolores

Miscellaneous "M"

Metallic Gold Mining Company

Teller

Miscellaneous "M"

Meteor Mine

Clear Creek

Metropolitan - Furstenberg

Clear Creek

Metropolitan Mine

Clear Creek

Metz Mine

Park

Mexico

San Miguel

Miami Mining & Milling Company

Mineral

Miscellaneous M & K

Miami Pineshade Mine

Boulder

Miscellaneous "M"

Mic C

Montrose

Mica Products Company

Denver

Miscellaneous "M"

Micawber

Gunnison

Micawber

Gunnison

Miscellaneous M

Michigan Mine

Summit

Mickey Breen

Ouray

Microcosm Tunnel

Rio Grande

Miscellaneous "M"

Mid Colorado Mines

Gilpin

Miscellaneous "M"

Midas Exploration Company

Lake

Middle Creek

Routt

Middle Hawk #2

San Miguel

Miscellaneous "M"

Middlesex Mining & Milling Company

Summit

Miscellaneous "M"

Midget Mine

Teller

Midget Mine

Jackson

Miscellaneous "M"

Midland Chief Mining

Clear Creek

Midnight

Rio Blanco

Midnight

Rio Blanco

Miscellaneous "M"

Midnight Mine

Pitkin

Midnight Mine

San Miguel

Miscellaneous "M"

Midway Gold Mining Company

Teller

Miscellaneous "M"

Midwest

Mineral

Mid-West Co.

Summit

Mighty Monarch

San Juan

Mikado Mine

Lake

Mike's Adit

Boulder

Miscellaneous "M"

Mike's Strike

San Juan

Miscellaneous "M"

Milan Mine

Boulder

Milbob

Saguache

Miscellaneous "M"

Mildred Gold Mine Company

Summit

Miscellaneous "M"

Mile High

Boulder

Miscellaneous "M"

Mill #1, #2, #4

Montrose

Mill Gulch Mine

Park

Mill Tailings Dump

Fremont

Miscellaneous M

Millasier Mining Corporation

Teller

Miller & Son

Park

Miscellaneous "M"

Miller and Oram

Gunnison

Miscellaneous M

Miller Gold Mining, Milling & Tunnel Company

Lake

Miscellaneous "M"

Miller Milling & Mines Company

Teller

Miscellaneous "M"

Miller Tunnel

Clear Creek

Millie G No. 1

Lake

Millington Mine

Clear Creek

Mills Group

Montezuma

Miscellaneous "M"

Milwaukee Mine

Boulder

Milwaukee Tunnel & Mining Company

Dolores

Miscellaneous "M"

Minday

Teller

Miscellaneous "M"

Mine Flower Mine

Summit

Miscellaneous "M"

Miner Boy

Lake

Miscellaneous "M"

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

Miscellaneous "M"

Mineral Mountain Mine

San Miguel

Miscellaneous "M"

Mineral Park #2, #4, #5

Montrose

Mineral Park Mine

Park

Mineral Point Mine

San Juan

Miscellaneous "M"

Minerals Engineering Company

Gunnison

Miscellaneous M

Minerals Engineering Company

Mesa

Minerals Management

San Miguel

Miscellaneous "M"

Minerals Production Company

San Juan

Minerals Recovery Company

Denver

Miscellaneous "M"

Minerva

Summit

Miscellaneous "M"

Mines & Securities Company

Gunnison

Miscellaneous M

Minneapolis Mine

Boulder

Miscellaneous "M"

Minnehaha

San Juan

Minnesota Gold Mining & Tunnel Company

Clear Creek

Miscellaneous "M"

Minnesota Group

Grand

Minnesota Mine

Gilpin

Minnie

Summit

Minnie B Mine

Summit

Minnie B. Mine

Ouray

Miscellaneous "M"

Minnie D

Routt

Miscellaneous "M"

Minnie Foy Mine

Boulder

Miscellaneous "M"

Minnie Lee Mine

Hinsdale

Miscellaneous "M"

Minnie Mine

Clear Creek

Miscellaneous "M"

Mint Mine

Clear Creek

Miramonte Reservoir Dam

San Miguel

Miscellaneous "M"

Miscellaneous "B"

Delta

Miscellaneous "C"

Delta

Miscellaneous "D"

Summit

Empty

Miscellaneous "F"

Delta

Miscellaneous "H"

Delta

Miscellaneous "I"

Saguache

Empty

Miscellaneous "K"

Delta

Miscellaneous "O"

Saguache

Empty

Miscellaneous "Q"

Summit

Empty

Miscellaneous "S"

Delta

Miscellaneous "S"

Park

out per jb on 3/11/97

Miscellaneous "S"

Routt

Empty

Miscellaneous "T"

Routt

Empty

Miscellaneous "U"

San Miguel

Empty

Miscellaneous "Y"

San Miguel

Empty

Miscellaneous Coal

Garfield

Miscellaneous Oil Shale

Mesa

Miser Tunnel

Rio Grande

Miss Dividends Mine

Clear Creek

Miscellaneous "M"

Missing Link Mine

Boulder

Miscellaneous "M"

Missionary Tunnel

Rio Grande

Miscellaneous "M"

Missoula Mine

Boulder

Missouri Mine

Park

Missouri Consolidated Mining Company

Gilpin

Miscellaneous "M"

Missouri Girl Mine

Mesa

Miscellaneous "M"

Missouri Mine

Summit

Mistletoe Mine

Gilpin

Miscellaneous "M"

Mitchell Drilling Company

Mesa

Miscellaneous "M"

Mitchell Mine

Gilpin

Mitchell Mine

Summit

Miscellaneous "M"

Mix Mine

Clear Creek

Mocking Bird

Gilpin

Miscellaneous "M"

Modena Mine

San Miguel

Modene Group

Montrose

Modern "Gold of Ophir" Mining Company

Montrose

Miscellaneous "M"

Modern Ore Reduction Company

Boulder

Miscellaneous "M"

Modoc Mine

Lake

Miscellaneous "M"

Modoc Mine

Teller

Moffat Tunnel

Grand

Moffat Tunnel

Teller

Moffat Tunnel

Teller

Miscellaneous "M"

Mogul

San Juan

Mogul Mill Tailings

San Juan

Miscellaneous "M"

Mogul Mining Company

San Juan

Miscellaneous "M"

Mogul Tunnel

Boulder

Mohawk

Gunnison

Miscellaneous M

Mohawk

San Juan

Mohawk

Summit

Molas Mine

San Juan

Mollie B Mine

Summit

Mollie Bawn Mine

Clear Creek

Mollie Gibson Dump

Pitkin

Miscellaneous "M"

Mollie S Mine

Mineral

Molly Kathleen Mine

Teller

Moltke Mine

Boulder

Moly Mine & Mill

Fremont

Miscellaneous M

Molybdenum Production Corporation

Summit

Mona

Larimer

Monarch

La Plata

Monarch

Ouray

Monarch - Badger

Summit

Monarch & Anglo Saxon

San Juan

Miscellaneous "M"

Monarch Gold Mining Company

La Plata

Miscellaneous "M"

Monarch Mine

Gilpin

Monarch Mine

Lake

Monarch Mine

San Juan

Monarch Pool Mining Company

Chaffee

Miscellaneous "M"

Monarch Shale Oil

Garfield

Monarch Tunnel & Development Company

Chaffee

Miscellaneous "M"

Monitor Mine

Gunnison

Miscellaneous M

Mono - Ajax

Hinsdale

Miscellaneous "M"

Monogram Group

Montrose

Monomouth Mining & Leasing

Gunnison

Monon Mine

Mineral

Monon Mine

Saguache

Miscellaneous "M"

Monster

Montrose

Montana Mine

Gilpin

Monte Carlo

Gunnison

Miscellaneous M

Monte Cristo

Clear Creek

Miscellaneous "M"

Monte Cristo Mine

Summit

Monte Cristo Shaft

Ouray

Miscellaneous "M"

Monte Cristo Tunnel

Teller

Monte Queen

Hinsdale

Montezuma - Gold Reef Group

La Plata

Miscellaneous "M"

Montezuma Mine

Boulder

Miscellaneous "M"

Montezuma Mine

Pitkin

Miscellaneous "M"

Montezuma Mines & Mills

Summit

Montezuma Valley Irrigation

Montezuma

Miscellaneous "M"

Montezuma, Silver Lead Mining Company

Summit

Miscellaneous "M"

Montgomery Dam

Park

Montgomery Shaft

Teller

Miscellaneous "M"

Monticello Mines Company

San Miguel

Miscellaneous "M"

Montreal Gold Mining & Milling Company

Teller