A few days ago, Empire Mine shut the Visitor's Center and its parking, but one person is there to help you with information if you call. If you would like to know if the gates are still open, they are encouraging you to call the Visitor Center at 530-273-8522
"Executive Order N-33-20, which requires all Californians to “shelter-in-place” by remaining at home or at their place of residence, except as necessary to obtain food, care for a relative or friend, get necessary healthcare, or go to an essential job."
The county and state orders are not stopping you from hiking or riding your horse or bike outside, but you must maintain social distancing and not gather in groups.
Empire Mine is also under the Nevada County CODE RED instructions, meaning Nevada County is on lockdown. No visitors from outside the county. This a mandatory order.