|
ine
|
County
|
|
N. K. W. Gold Mining Company
|
Teller
|
|
Nabob
|
Clear Creek
|
|
Nanawah Mine
|
Clear Creek
|
|
Nancy Cleo
|
Chaffee
|
|
Nancy Group
|
Boulder
|
|
Naomi Ann
|
Rio Blanco
|
|
Napoleon
|
Gunnison
|
|
Nare
|
Jefferson
|
|
Narrow
|
San Juan
|
|
Nasby
|
Ouray
|
|
Nashville Mine
|
Gilpin
|
|
National #2
|
Boulder
|
|
National Belle
|
Ouray
|
|
National Consolidated Mines Incorporated
|
Ouray
|
|
National Group
|
Mineral
|
|
National Liberty Mining & Reduction Company
|
Gunnison
|
|
National Mine
|
Clear Creek
|
|
National Treasure Mine
|
Summit
|
|
National Tungsten Company
|
Boulder
|
|
National Tunnel Mining & Milling Company
|
Gilpin
|
|
Nations Treasure Mine
|
Boulder
|
|
Navajo
|
Custer
|
|
Navajo
|
San Miguel
|
|
Navajo Mine
|
Saguache
|
|
Navy Mine
|
Summit
|
|
Neath Mine
|
Clear Creek
|
|
Needles Eye Tunnel
|
Gilpin
|
|
Neglected Mine
|
Clear Creek
|
|
Neglected Mine
|
La Plata
|
|
Negro Infant
|
Lake
|
|
Nellie and Laura Mine
|
San Miguel
|
|
Nellie B Claim
|
Lake
|
|
Nellie B. Mine
|
Chaffee
|
|
Nellie Bell Group
|
Gilpin
|
|
Nellie Bly Shaft
|
Chaffee
|
|
Nellie Creek
|
Hinsdale
|
|
Nellie K. Mine
|
Teller
|
|
Nellie Mine
|
San Miguel
|
|
Nellie V Shaft
|
Teller
|
|
Nelson Mines
|
Boulder
|
|
Nelson Oro Mine
|
Gilpin
|
|
Nelson Tunnel & Mining Company
|
Rio Grande
|
|
Nemaha Tunnel
|
Custer
|
|
Nemeha Mine
|
Gilpin
|
|
Neodosha Mine
|
Ouray
|
|
Neptune Mine
|
Clear Creek
|
|
Nest Egg Mine
|
Teller
|
|
Nettie B. Mine
|
Clear Creek
|
|
Nettie Mine
|
Boulder
|
|
Nevada
|
San Miguel
|
|
Nevada Mine
|
Ouray
|
|
New Alps Consolidated Mining Company
|
Lake
|
|
New Boston Mine & Mill
|
Clear Creek
|
|
New Century
|
Clear Creek
|
|
New Clara Mining & Milling Company
|
Lake
|
|
New Dawn
|
Dolores
|
|
New Dawn Group
|
Clear Creek
|
|
New Deal Mine
|
Routt
|
|
New Deal Mine
|
Summit
|
|
New Discovery
|
Chaffee
|
|
New Discovery
|
Lake
|
|
New Discovery
|
Mineral
|
|
New Dominion Mine
|
San Miguel
|
|
New Enterprise Mine
|
Boulder
|
|
New Era
|
Summit
|
|
New Era Mine
|
Clear Creek
|
|
New Extension Mine
|
Summit
|
|
New Girl Mine
|
Boulder
|
|
New Hope
|
Custer
|
|
New Hope
|
Larimer
|
|
New Hope Mining Company
|
Lake
|
|
New Hope Mining Company
|
Teller
|
|
New Hope Tunnel
|
Clear Creek
|
|
New Mammoth Mining & Milling Company
|
Lake
|
|
New Mining & Land Company
|
Lake
|
|
New Morning Gold Mining Company
|
Boulder
|
|
New President Dump
|
Lake
|
|
New Prussian Mine
|
Boulder
|
|
New Queen of the Hills
|
Mesa
|
|
New Recruit
|
Summit
|
|
New Rival Mine
|
Boulder
|
|
New South Canon
|
Garfield
|
|
New Totalless Mining & Investment Company
|
Lake
|
|
New Tunnel
|
Lake
|
|
New Uncle Sam
|
San Miguel
|
|
New Verde
|
Mesa
|
|
New Wapiti Mining Company
|
Summit
|
|
New Yok Mine
|
Summit
|
|
New York Mine
|
Boulder
|
|
New York Mine
|
Mineral
|
|
New York Union Gold Mining Company
|
Boulder
|
|
New Zealand Shaft
|
Teller
|
|
Newark Mine
|
Park
|
|
Newhouse Tunnel
|
Clear Creek
|
|
Newlin Creek
|
Fremont
|
|
Newman Hill Project
|
Clear Creek
|
|
Newman Tunnel
|
Pitkin
|
|
Newport & Providence
|
Gilpin
|
|
Newsboy Company
|
Ouray
|
|
Newton Tunnel
|
Teller
|
|
Next President Mine
|
Gilpin
|
|
Niagara Mine
|
Clear Creek
|
|
Nicholls Mine
|
Boulder
|
|
Nicholson Lease
|
Lake
|
|
Nielson & Larsen Mining Company
|
San Miguel
|
|
Night Hawk Mine
|
Teller
|
|
Night Shade
|
Boulder
|
|
Nightingale Mine
|
Teller
|
|
Nil #2
|
Montrose
|
|
Nil Desperandum Mines Company
|
Boulder
|
|
Nil Sine Numine
|
Boulder
|
|
Nimrod Mine
|
Clear Creek
|
|
Nineteen Hundred Five
|
Boulder
|
|
Ninety Four Mine
|
Boulder
|
|
Ninety One Mine
|
Gilpin
|
|
Nisi Prius Mine
|
Lake
|
|
No End Group
|
Park
|
|
No Name
|
Fremont
|
|
No Name
|
Gilpin
|
|
No Name
|
Lake
|
|
No Name
|
Park
|
|
No Name #3
|
Rio Blanco
|
|
No Name Mine
|
Boulder
|
|
No. 8 Lode
|
Clear Creek
|
|
Nola 3
|
San Miguel
|
|
Nome
|
San Juan
|
|
Nooster Tunnel & Mining Company
|
Rio Grande
|
|
Noppe Mine
|
Eagle
|
|
Nora Lily Mine
|
Dolores
|
|
Norad
|
El Paso
|
|
Norcross Chemical Company
|
Denver
|
|
Norma Jean Mine
|
San Miguel
|
|
Norman Jean
|
San Juan
|
|
Normandy Mine
|
Summit
|
|
Norsigo Mill
|
Lake
|
|
Norsigo Processing & Refining Limited
|
Lake
|
|
North America Mining Company
|
Clear Creek
|
|
North American Exploration Company Limited
|
San Miguel
|
|
North Cheyenne Canyon
|
El Paso
|
|
North Continent Mine
|
San Miguel
|
|
North Fork Tunnel
|
Clear Creek
|
|
North Gilpin Gold Mining Company
|
Gilpin
|
|
North Hammer
|
Montrose
|
|
North London Mine
|
Park
|
|
North Moyer Dump
|
Lake
|
|
North Park Company
|
Jackson
|
|
North Pole
|
Gunnison
|
|
North Slope
|
San Miguel
|
|
North Star
|
Gilpin
|
|
North Star
|
Gunnison
|
|
North Star
|
Ouray
|
|
North Star
|
San Juan
|
|
North Star & Holliston
|
Teller
|
|
Norther #6
|
San Miguel
|
|
Northern Light
|
San Miguel
|
|
Northern Light Mine
|
Gunnison
|
|
Northern No. 1
|
Rio Blanco
|
|
Northern Ohio
|
San Miguel
|
|
Northfield
|
El Paso
|
|
Northgate
|
Jackson
|
|
Northwestern Engineering Company
|
Dolores
|
|
Northwestern Gold Mining & Milling
|
Boulder
|
|
Novasembla Mine
|
Park
|
|
NRA Mine
|
Boulder
|
|
Nucla Strip
|
Montrose
|
|
Nucles
|
San Miguel
|
|
Nu-Gap
|
Garfield
|
|
Number 2 Tunnel
|
Pitkin
|
|
Number Five Mine
|
Boulder
|
|
Nu-Mine No. 2
|
Gunnison
|
|
Nutmeg
|
Dolores
|
|
Nye Mathews Mining Company Incorporated
|
Gilpin
|
|
O & M Mine
|
Boulder
|
|
O. C. Mine No. 2
|
Gunnison
|
|
O. J. & G. M. Lease
|
Lake
|
|
O. J. Property
|
Costilla
|
|
O. P. Group
|
Gunnison
|
|
O. S. Storrs Mine
|
Clear Creek
|
|
Oak Claim
|
Teller
|
|
Oakland Mine
|
Pitkin
|
|
Obnoxious
|
Montrose
|
|
Occidental
|
Boulder
|
|
Occidental
|
San Juan
|
|
Occidental Mine
|
Boulder
|
|
Ocean Queen Mine
|
Clear Creek
|
|
Ocean Spray
|
Montrose
|
|
Ocean Wave Mine
|
Hinsdale
|
|
Ocean Wave Mine
|
Teller
|
|
Ochner Hotaling Company
|
Mesa
|
|
Ochre Mine
|
Mineral
|
|
O'Connell Drilling Company
|
Mesa
|
|
October Adit
|
Mesa
|
|
Ocumpaugh
|
San Miguel
|
|
Ocumpaughy
|
San Miguel
|
|
Ohilo
|
Fremont
|
|
Ohio
|
Boulder
|
|
Ohio
|
San Juan
|
|
Ohio Tunnel
|
Lake
|
|
Oil Shale Mining Company
|
Garfield
|
|
Ojo
|
Huerfano
|
|
OK Mining & Milling Company
|
Teller
|
|
O'Kan
|
Mesa
|
|
Oklahoma Mine
|
Boulder
|
|
Old '76 Mine
|
Lake
|
|
Old Crucible Mining & Milling Company
|
Boulder
|
|
Old Dougherty Mine
|
Gilpin
|
|
Old Faithful
|
Gunnison
|
|
Old Grandad
|
Montrose
|
|
Old Green Mountain
|
San Juan
|
|
Old Hundred Mine
|
San Juan
|
|
Old Kentucky Mine
|
Montezuma
|
|
Old Lost Claim
|
San Miguel
|
|
Old Lot Mine
|
Gunnison
|
|
Old Lout
|
Ouray
|
|
Old Lout Mine
|
San Juan
|
|
Old Maid Group
|
Ouray
|
|
Old Man
|
San Miguel
|
|
Old Salt Lick
|
Montrose
|
|
Old Settler Mine
|
Clear Creek
|
|
Old Smoky
|
Ouray
|
|
Old South London
|
Park
|
|
Old Stag Mine
|
San Miguel
|
|
Old Stone Wall Mine
|
Clear Creek
|
|
Old Tom
|
Gunnison
|
|
Old Town Company
|
Clear Creek
|
|
Old Town Mine
|
Gilpin
|
|
Oliver
|
Fremont
|
|
Oliver Twist Mine
|
Park
|
|
Ollie Reed Mine
|
Lake
|
|
Omaha
|
Clear Creek
|
|
Omega
|
San Miguel
|
|
One
|
Montezuma
|
|
One & Three Quarters Mine
|
Boulder
|
|
One Star No. 1
|
Pitkin
|
|
Oneida - Stag
|
Clear Creek
|
|
O'Neill Group
|
San Miguel
|
|
O'Neill, Bull & Martin
|
Montrose
|
|
Onondaga Mine
|
Clear Creek
|
|
Ontario Mine
|
Clear Creek
|
|
Ontario Mine
|
Lake
|
|
Onyx Mines Company
|
Lake
|
|
Open Cut Mine
|
Montrose
|
|
Opera Box Group
|
Montrose
|
|
Ophir
|
Teller
|
|
Ophir #17 & 27
|
San Miguel
|
|
Ophir Creek Gold Mining & Milling Company
|
Custer
|
|
Ophir Iron Springs
|
San Miguel
|
|
Ophir Mine
|
Boulder
|
|
Ophir Mine
|
Gilpin
|
|
Ophir Mine
|
Ouray
|
|
Ophir Mine
|
Park
|
|
Ophir Mine
|
Teller
|
|
Ophir Nevada
|
Hinsdale
|
|
Ophir Range Gold Mine
|
San Miguel
|
|
Ophir Tunnel
|
San Miguel
|
|
Ora Alta Mining Company
|
Park
|
|
Orange Shaft
|
Custer
|
|
Orchard Tunnel
|
Archuleta
|
|
Orchard Valley - Converse
|
Delta
|
|
Ore Body
|
Costilla
|
|
Ore Buying Station - Mineral Recovery Corporation
|
Montrose
|
|
Ore Products Corporation
|
Denver
|
|
Oregon
|
Montrose
|
|
Oregon
|
Saguache
|
|
Oregon Mine
|
Clear Creek
|
|
Oregon Mine & Mill
|
Boulder
|
|
Ores & Metals Mining & Milling Company
|
Ouray
|
|
Orient Mine
|
Clear Creek
|
|
Orient Mine
|
Saguache
|
|
Oriental Mine
|
Clear Creek
|
|
Oriole Tunnel
|
Lake
|
|
Orizaba Mine
|
Grand
|
|
Orlando
|
Gilpin
|
|
Ormsbee Development Company
|
Grand
|
|
Oro
|
Dolores
|
|
Oro Mine
|
Teller
|
|
Orpha May Mine
|
Teller
|
|
Orphan Boy
|
Park
|
|
Orphan Boy Mine
|
Boulder
|
|
Orphan Mine
|
Clear Creek
|
|
Osceola Lease
|
San Juan
|
|
Otisito Mines Company
|
Lake
|
|
Ottawa Mine
|
Clear Creek
|
|
Ouray
|
San Juan
|
|
Ouray Mining Company's Mine
|
San Juan
|
|
Ouray Tungsten Mining Company
|
Ouray
|
|
Out West Mill
|
Montezuma
|
|
Out West Mine
|
Montezuma
|
|
Outlaw
|
Mesa
|
|
Outlet Tunnel
|
Mineral
|
|
Outlet Tunnel
|
Montrose
|
|
Outlet Works Trinidad
|
Las Animas
|
|
Overland Production & Refining
|
Garfield
|
|
Oversite
|
Montrose
|
|
Owenby Group
|
San Miguel
|
|
Owl Canyon Road
|
Larimer
|
|
Owl Tunnel
|
Summit
|
|
Oxide Mine
|
Fremont
|
|
Oyla
|
San Miguel
|
