This 784 acre State Park is close to downtown Grass Valley.  The trails are relatively level
and wind through the pine-forested land that was once one of the largest working hardrock mines
in Nevada County.  To get there, exit on Hwy 49 at Empire Street. Travel east for about one
mile, and you will arrive at the mine. Park in the main parking lot.  There are 3 major trails to hike:

HARDROCK TRAIL  -  This 2 mile loop passes through the historic mining site.
Mountain bikes and horse back riding are are not permitted on this trail.

OSBORNE HILL TRAIL  -  This 5 mile loop winds through old mine sites with foundations.
 The hike takes you through tall pines and along a year-round creek.
Horseback riding and mountain bikes are permitted on this trail.

UNION HILL TRAIL -  This 5 mile loop lets you see old mine sites and the historic pipeline
that brought water to the mines.  The whole hike is in a thick pine forest.
Horseback riding and mountain bikes are permitted on this trail.