In December 1873, a 4,000 foot tunnel was completed through Big Lick Mountain in Dauphin County. Williamstown Tunnel opened up Bear Valley for profitable coal mining.
The completion of Williamstown Tunnel – 1873

In December 1873, a 4,000 foot tunnel was completed through Big Lick Mountain in Dauphin County. Williamstown Tunnel opened up Bear Valley for profitable coal mining.
The accidental explosion in Bear Valley, in Schuylkill County, could be heard as far away as Harrisburg.