We noticed that you're using an unsupported browser. The TripAdvisor website may not display properly.
We support the following browsers:
Windows: Internet Explorer, Mozilla Firefox, Google Chrome. Mac: Safari.

Grass Valley Guide

  • Walking tours (1)
  • Before You Go
EveryTrail
Hardrock Trail and Osborn Hill Loop
Hardrock Trail and Osborn Hill Loop

Welcome to Empire Mine State Historic Park, home to Empire Mine, which was once the most profitable gold mine in California during the gold rush. This hike will take you around the Empire Mine site...

Rated 5 out of 5 by EveryTrail members