Admission for Ages 13 and Up - Info can be found on our Dig for Gems and FAQ pages. - Dates are updated weekly. Up to 8 weeks are available at a time. - Want to visit on a different day? See if our Special Reservations work for you! - Return customer? Check out the Loyalty Card. If you have any questions, please Contact Us. Need a place to stay? Stay at the local Best Western in Coalinga, CA and receive a 20% discount on the entirety of your stay when you mention us! NOTICE: Serpentine is present in digging material. Come at your own risk. You are welcome to bring a mask/protective gear. CALIFORNIA PROPOSITION 65 WARNING: Entering can expose you to chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov