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O. I. C. Mine (ca.1892- ? ), located on the P. C. & Y . Railroad, Burdine, Chartiers Twp., Allegheny Co., PA
Owners: (ca.1892-  ?  ), W. J. Steen Company, Chartiers, PA
              (ca.1898-  ?  ), W. J. Steen Company, Carnegie, PA
              (ca.1900-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1903-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1905-  ?  ), Pittsburg Coal Company, Pittsburgh, PA
Web sites on the O.I.C. Mine, Burdine, Chartiers, Allegheny Co., PA:
    Coal Miners Memorial O.I.C. Mine, Burdine, Chartiers Twp., Allegheny Co., PA

O. J. Hall Company, East Pittsburgh, PA
See: Hall Mine, Allegheny Co., PA
See also: Hall Company, East Pittsburgh, PA

O'Neil & Company,
See: Enterprise Mine, Alleghgeny Co., PA

O'Neil Company, Elizabeth, PA
See: H. D. O'Neil Mine, Allegheny Co., PA
See also: H. D. O'Neil Company, Elizabeth, PA

O'Niel & Peterson Company, Bunola, PA
See: Bunola Mine, Bunola, Forward Twp., Allegheny Co., PA

Oak, Allegheny Co., PA
See: Oak Mine (Oak Hill No. 1 Mine) (Castle Shannon Mine), Oak, Allegheny Co., PA
        Oak Hill No. 2 Mine, Oak, Allegheny Co., PA

Oak Station, Allegheny Co., PA
[Located on the Castle Shannon Railroad.]
See: Oak Mine (Oak Hill No. 1 Mine) (Castle Shannon Mine), Oak, Allegheny Co., PA
        Oak Hill No. 2 Mine, Oak, Allegheny Co., PA

Oak Hill Mine (ca.   ?   ), located at West Liberty, Allegheny Co., PA
Owners:   ?

Oak Mine
(Oak Hill No. 1 Mine)
(Castle Shannon Mine) (ca.1878-  ?  ), a drift mine, located on the P. and C. S. Railroad, Oak Station, Allegheny Co., PA
Owners: (ca.1878-  ?  ), Dickson, Stewart & Company,
              (ca.1903-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1905-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
Web sites on the Oak Mine, Oak, Allegheny Co., PA:
    Coal Miners Memorial Oak Mine, Oak, Allegheny Co., PA

Oak Hill No. 2 Mine (ca.1878-  ?  ), located on the Pennsylvania Railroad, Oak, Allegheny Co., PA
Owners: (ca.1878-  ?  ), Dickson, Stewart & Company.
Web sites on the Oak Hill No. 2 Mine, Oak, Allegheny Co., PA:
    Coal Miners Memorial Oak Hill No. 2 Mine, Oak, Allegheny Co., PA

Oak Hill No. 3 Mine (ca.1878-  ?  ), located on the Pennsylvania Railroad, and the Bessemer & Lake Erie Railroad, near Turtle Creek, Allegheny Co., PA
[A drift Mine, pick mine, mining the 5 foot thick Pittsburg Coal Vain.]
Owners: (ca.1878-  ?  ), Dickson, Stewart & Company,
              (ca.1903-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1906-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1909-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1910-  ?  ), New York & Cleveland Gas Coal Company, Pittsburgh, PA
Web sites on the Oak Hill No. 3 Mine, Turtle Creek, Alegheny Co., PA:
    Coal Miners Memorial Oak Hill No. 3 Mine, Turtle Creek, Allegheny Co., PA

Oak Hill No. 4 Mine (ca.1889-  ?  ), located on the Bessemer & Lake Erie Railroad, near Turtle Creek, Allegheny Co., PA
Owners: (ca.1889-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1892-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1898-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA 
              (ca.1903-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
Web sites on the Oak Hill No. 4 Mine, Turtle Creek, Alegheny Co., PA:
    Coal Miners Memorial Oak Hill No. 4 Mine, Turtle Creek, Allegheny Co., PA

Oak Hill No. 5 Mine (ca.1903-  ?  ), located on the Pennsylvania Railroad, and the Bessemer & Lake Erie Railroad [Union Railroad], near Wilkinsburg, Gascola, Patton Twp., Allegheny Co., PA
[A drift Mine, pick mine, mining the 8 foot thick Pittsburg Coal Vain.]
Owners: (ca.1903-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1909-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1910-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
Web sites on the Oak Hill No. 5 Mine, near Turtle Creek, Gascola, Patton Twp., Alegheny Co., PA:
    Coal Miners Memorial Oak Hill No. 5 Mine, near Turtle Creek, Gascola, Patton Twp., Allegheny Co., PA

Oak Hill No. 6 Mine (ca.1903-  ?  ), located on the Bessemer & Lake Erie Railroad [Union Railroad], on the oposite hill from the Oak Hill No. 5 Mine, near Monroeville, Penn Twp., Allegheny Co., PA
[Oak Hill No. 6 Mine was listed as a new mine ca.1903.]
Owners: (ca.1903-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1906-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
              (ca.1909-  ?  ), New York & Cleveland Gas Coal Company, Turtle Creek, PA
Web sites on the Oak Hill No. 6 Mine, Turtle Creek, Alegheny Co., PA:
    Coal Miners Memorial Oak Hill No. 6 Mine, Turtle Creek, Allegheny Co., PA

Oak Ridge Coal Company, Limited, Oak Dale, PA
[Acquired by Pittsburgh Coal Company.]
See: Oakridge Mine, Allegheny Co., PA

Oak Ridge Coal Company, Limited, Fourth Ave., Pittsburgh, PA
See: Oakridge Mine, Allegheny Co., PA

Oak Ridge Mine, Allegheny Co., PA
See: Oakridge Mine, Allegheny Co., PA

Oakdale, Allegheny Co., PA
See: Oak Ridge Coal Company, Oakdale, PA
        Oakridge Mine, Oakdale, Allegheny Co., PA
        R. J. McClean Coal Company, Oakdale, PA
        Valley Coal & Supply Company, Oakdale, PA

Oakdale Mine (ca.1905-  ?  ), located on the P.C. C. & St. L. Railroad, Oakdale, near Carnegie, Allegheny Co., PA
Owners: (ca.1905-  ?  ), Carnegie Coal Company, Carnegie, PA
              (ca.1916-  ?  ), Carnegie Coal Company, Pittsburgh, PA
              (ca.1917-  ?  ), Carnegie Coal Company, Pittsburgh, PA
              (ca.1919-  ?  ), Carnegie Coal Company, Pittsburgh, PA
              (ca.1920-  ?  ), Carnegie Coal Company, Pittsburgh, PA
Web sites on the Oakdale Mine, Oakdale, Carnegie, Allegheny Co., PA:
    Coal Miners Memorial Oakdale Mine, Oakdale, Carnegie, Allegheny Co., PA

Oakmont No. 1 Mine
(Barking Mine) (ca.1919-  ?  ), located along the Allegheny River at Barking, Plum Twp., Allegheny Co., PA
Owners: (ca.1919-  ?  ), Diamond Coal & Coke Company, Pittsburgh, PA
              (ca.1920-  ?  ), Diamond Coal & Coke Company, Pittsburgh, PA
              (ca.1931-  ?  ), Hillman Coal & Coke Company, Pittsburgh, PA
              (ca.1933-  ?  ), Hillman Coal & Coke Co.
              (ca.1936-  ?  ), Hillman Coal Company,
Web sites on the Oakmont Mines (Barking Mines), Barking, Plum Twp., Allegheny Co., PA:
    Coal Miners Memorial Oakmont Mines (Barking Mines), Barking, Plum Twp., Allegheny Co., PA
    History of the Oakmont Mine (Barking Mines), Barking, Plum Twp., Allegheny Co., PA

Oakridge Mine
(Oak Ridge Mine) (ca.1878-  ?  ), located on the Pittsburgh, Cincinnati & St. Louis Railway, Oakdale, Allegheny Co., PA
Owners: (ca.1878-   ?   ), Oak Ridge Coal Company, Ltd.,
              (ca.1889-   ?   ), Oak Ridge Coal Company, Limited, Oak Dale, PA
              (ca.1892-   ?   ), Oak Ridge Coal Company, Limited, Fourth Avenue, Pittsburgh, PA
              (ca.1898-   ?   ), Oak Ridge Coal Company, Limited, Pittsburg, PA
              (ca.1900-   ?   ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1903-  ?    ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1905-   ?   ), Pittsburg Coal Company, Pittsburgh, PA
              (ca.1917-   ?   ), R. J. McClean Coal Company, Oakdale, PA
              (ca.1918-1919), Hormel Coal Company, Hickman, PA
              (ca.1919-1920), R. J. McClean Coal Company, Oakdale, PA
              (ca. 1920-  ?   ), Gladden Coal Company, Oakdale, PA
Web sites on the Oakridge Mine, Oakdale, Allegheny Co., PA:
    Coal Miners Memorial Oakridge Mine, Oakdale, Allegheny Co., PA

Oblock Coal Company, Pum Twp., Allegheny Co., PA
See:

Ocean Mine (ca.1889-  ?  ), located on the Pennsylvania Railroad, Wilkinsburg, Allegheny Co., PA
Owners: (ca.1889-  ?  ), George Vogele Company
              (ca.1892-  ?  ), Gottlieb Vogele Company,
              (ca.1898-  ?  ), Gottlieb Voegele Company, Wilkinsburg, PA
              (ca.1901-  ?  ), G. Vogele Company, Pittsburg, PA
Web sites on the Ocean Mine, Wilkinsburg, Allegheny Co., PA:
    Coal Miners Memorial Ocean Mine, Wilkinsburg, Allegheny Co., PA

Ocean No. 1 Mine PCC
[Ocean No. 1 Mine PCC was located in Westmoreland Co., PA]

Ocean No. 1 Mine PCC
(Scott's Mine No. 1)
(Ocean Mine) (ca.1875- ?  ), located on the Pittsburg & Connellsville Railroad, later it became the B. & O. Railroad, at Scott Haven (Moore's Station), Sewickley Twp., Westmoreland Co., PA
[Mine was first called Ocean Mine, when Thomas Moore operated the mine, then changed to Scott's Mine No. 1, name was changed to Ocean No. 1 Mine when the Pittsburgh Coal Company purchased the mine, ca.1898.]
Owners: (ca.1875-  ?  ), Thomas Moore Company, Scott Haven, PA
              (1880's-1898), W. L. Scott Coal Company, Scott Haven, PA
              (ca.1898-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
                                      Company Store:  Federal Supply Company
              (ca.1901-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1903-  ?  ), Pittsburg Coal Company, Pittsburg, PA  
              (ca.1905-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
              (ca.1923-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
Web sites on the Ocean No. 1 Mine PCC (Scott's Mine No. 1), Scott Haven, Sewickley Twp., Westmoreland Co., PA:
    Coal Miners Memorial Ocean No. 1 Mine PCC (Scott's Mine No.1), Scott Haven, Sewickley Twp., Westmoreland Co, PA

Ocean No. 2 Mine PCC (ca.1889-  ?  ), located on the Youghiogeny Division Branch of the Pittsburgh & Lake Erie Railroad, near Frank, Elizabeth Twp., Allegheny Co., PA
[A disastrous fire occurred in this mine Wednesday, January 14, 1903, which necessiated the sealing off of the mine with air tight stoppings.  On May 2, 1903, the mine was re-opened, the fire found to by extinguished and the work of cleaning up the mine commenced.]
Owners: (ca.1889-  ?  ), Youghiogheny River Coal Company, Scott Haven, Westmoreland Co., PA
              (ca.1892-  ?  ), Youghiogheny River Coal Company, Scott Haven, PA
              (ca.1900-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1903-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1905-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
              (ca.1923-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
Web sites on the Ocean No. 2 Mine, Frank, Allegheny Co., PA:
    Coal Miners Memorial Ocean No. 2 Mine, Frank, Elizabeth Twp., Allegheny Co., PA

Ocean No. 3 Mine PCC (ca.1889- ? ), located on the Youghiogeny Division Branch of the Pittsburgh & Lake Erie Railroad, near Frank, Elizabeth Twp., Allegheny Co., PA
Owners: (ca.1889-  ?  ), Youghiogheny River Coal Company, Scott Haven, Westmoreland Co., PA
              (ca.1903-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1905-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
Web sites on the Ocean No. 3 Mine, Frank, Allegheny Co., PA:
    Coal Miners Memorial Ocean No. 3 Mine, Frank, Elizabeth Twp., Allegheny Co., PA

Ocean No. 4 Mine PCC (ca.1889- ? ), located on the Youghiogn=eny River, Youghiogeny Division Branch of the Pittsburgh & Lake Erie Railroad, near Frank, Elizabeth Twp., Allegheny Co., PA
Owners: (ca.1889-  ?  ), Youghiogheny River Coal Company, Scott Haven, Westmoreland Co., PA
              (ca.1892-  ?  ),  Youghiogheny River Coal Company Scott Haven, PA
              (ca.1900-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1903-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1905-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
Web sites on the Ocean No. 4 Mine, Frank, Allegheny Co., PA:
    Coal Miners Memorial Ocean No. 4 Mine, Frank, Elizabeth Twp., Allegheny Co., PA

Ocean No. 5 Mine PCC (ca.1889- ? ), located on the Youghiogeny River, on the Youghiogeny Division Branch of the Pittsburgh & Lake Erie Railroad, near Smithdale, Elizabeth Twp., Allegheny Co., PA
Owners: (ca.1889-  ?  ), Youghiogheny River Coal Company, Scott Haven, Westmoreland Co., PA
              (ca.1892-  ?  ), Youghiogheny River Coal Company, Scott Haven, PA
              (ca.1900-  ?  ), Pittsburg Coal Company, Pittsburg, PA
              (ca.1905-  ?  ), Pittsburgh Coal Company, Pittsburgh, PA
Web sites on the Ocean No. 5 Mine, Smithdale, Allegheny Co., PA:
    Coal Miners Memorial Ocean No. 5 Mine, Smithdale, Elizabeth Twp., Allegheny Co., PA

Old Bower Hill Mine (ca.1889- ? ), located in Allegheny Co., PA
Owners: (ca.1889- ?  ), A. Shulte Company, Bridgeville, PA
              (ca.1892- ?  ), A. J. Shulte Company, Bridgeville, PA

Old Eagle Coal Works (ca.1876-  ?  ), located near Monongahela City, Forward Twp., Allegheny Co., PA
See: Old Eagle Mine, Allegheny Co., PA 

Old Eagle Mine
(Old Eagle Coal Works)
(Morgan Mine) (ca.1876- ? ), located on the Monongahela Railroad, Monongahela City, Forward Twp., Allegheny Co., PA
[There were two mine openings at the Old Eagle Coal Works.]
[Coal was shipped to market on the Monongahela River.]
Owners: (ca.1876-  ?  ), W. H. Brown Company, Monongahela City, PA
              (ca.1889-  ?  ), W. H. Brown's Sons Company, Monongahela City, PA
              (ca.1892-  ?  ), Brown Brothers Company, Monongahela City, PA
              (ca.1898-  ?  ), W. H. Brown Sons Company, Monongahela, PA
              (ca.1903-  ?  ), Monongahela River Consolidated Coal & Coke Company, Pittsburgh, PA
Web sites on the Old Eagle Mine, Monongahela City, Allegheny Co., PA:
    Coal Miners Memorial Old Eagle Mine, Monongahela City, Allegheny Co., PA

Old Mine (ca.1878-  ?  ), located on the Pittsburgh & Castle Shannon Railway, Allegheny Co., PA
Owners: (ca.1878-  ?  ), Castle Shannon Coal Company,

Oliver Station, Mifflin Twp., Allegheny Co., PA
See:

Ollett Brothers Coal Company, Bridgeville, PA
See: Rosedale Mine, Allegheny Co., PA

Ontario Gas Coal Company, Pittsburgh, PA
See: Ontario Shaft Mine, Cokeburg, Bethlehem Twp., Washington Co., PA

Option P.O. (Millers Grove), Baldwin Twp., Allegheny Co., PA
See:

Ormsby Mine (ca.1884- ? ), located on the Pennsylvania Railroad, located on the South Side, Pittsburgh, Allegheny Co., PA
Owners: (ca.1884-  ?  ), Birmingham Coal Company, Limited, South Side, Pittsburgh, PA
              (ca.1892-  ?  ), Birmingham Coal Company, Limited, South Side, Pittsburgh, PA
              (ca.1898-  ?  ), Keeling Coal Company, Carrick, PA 
Web sites on the Ormsby Mine, Carrick, Allegheny Co., PA:
    Coal Miners Memorial Ormsby Mine, Carrick, Allegheny Co., PA

Osceola Coal Company, Emblem, PA
See: Osceola Mine, Emblem, South Versailles Twp., Allegheny Co., PA

Osceola Coal Company, Pittsburgh, PA
See: Osceola Mine, Emblem, South Versailles Twp., Allegheny Co., PA

Osceola Mine (ca.1884- ? ), located on the B & O. Railroad, on the Youghiogheny River opposite Greenock, Emblem, South Versailles Twp., Allegheny Co., PA
[In ca.1878 Mr. Jones leased the Osceola mine from Thomas Mellon, founder of the Mellon National Bank, and formed the Osceola Coal Company. This was the first mine owned by James Jones. He sold his interest in the Osceola Coal Company and formed a partnership with Congressman W. L. Scott of Erie, Pa. They leased the Grant mines at Carnegie from Judge Mellon and operated them for some time.]
Owners: (ca.   ?   -1878), Thomas Mellon Company,
              (ca.1878-   ?  ), James Jones Company,
              (ca.1878-   ?  ), Osceola Coal Company, Emblem, PA
              (ca.1884-   ?  ),   ?
              (ca.1889-   ?  ), Osceola Coal Company, Emblem, PA
              (ca.1892-   ?  ), Osceola Coal Company, Emblem, PA
              (ca.1905-   ?  ), Osceola Coal Company, Pittsburgh, PA
              (ca.1909-   ?  ), Myers Coal Company, McKeesport, PA
Web sites on the Osceola Mine, Emblem, South Versailles Twp., Allegheny Co., PA:
    Coal Miners Memorial Osceola Mine, Emblem, South Versailles Twp., Allegheny Co., PA

Otto, Portvue Twp., Allegheny Co., PA
[Located o the Pittsburgh & Lake Erie Railroad, Monongahela Division.]
See:

Overholt Coal Company, Pittsburgh, PA
See: Carpenter Mine, Allegheny Co., PA
See also: A. C. Overholt Coal Company, Pittsburgh, PA

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