Crater of Diamonds State Park, Arkansas
The only public diamond mine in the world. Pay the entrance fee, dig all day, and keep whatever you find — including actual diamonds. Visitors find an average of 1-2 diamonds per day. Bring your own tools or rent them on-site.
Emerald Hollow Mine, North Carolina
The only emerald mine open to the public in the US. You can sluice, dig, or pan for emeralds, sapphires, and 60+ other gems. North Carolina's western mountains sit in a geologically rich zone where pegmatite intrusions exposed gem-quality beryl.
Spencer Opal Mine, Idaho
One of the few places in the country where you can dig for precious opals. The Spencer area produces beautiful play-of-color opals from ancient volcanic deposits. Digging season is typically May–October.
General Rules for State Parks
Most state parks prohibit collection. National Parks strictly prohibit it. Your best bets are BLM land (casual collection usually free), National Forests (25 lbs/day rule), and dedicated fee-dig mines. Always check the park's specific regulations before you dig — fines can be steep.
Check Our Regulations Database
The We Lick Rocks dig regulations page covers BLM, National Forest, and state rules for every US state — including whether a permit is needed, bag limits, and contact info for the managing agency.