The Marshall Mine, northeast of Imperial, was opened by the Marcon Coal Company around 1920.  The mine was serviced by the Montour Railroad via a spur on the north side of the main track west of Jefferytown Tunnel.  The track followed McLaren Road for a short distance before turning north and following a creek up to the mine site.

 

The mine maps show that Marshall Mine had approximately six drift entries along the eastern side of the outcrop, between 1,145 and 1,155 feet MSL.  The railroad was at approximately 920 feet MSL, which means the spur climbed about 80 feet over a distance of 0.5 mile for an average grade of 3%.

 

This is a link to a satellite view of the spur and mine site.

Click on the image for higher resolution