BLM Land — The Rockhound's Best Friend
The Bureau of Land Management oversees 245 million acres of public land, mostly in the Western US. Most BLM land explicitly allows "casual collection" — up to 25 lbs per day per person, plus one piece if it exceeds 25 lbs — with no permit required. This includes rocks, minerals, and common invertebrate fossils.
National Forest Rules
USDA National Forests (193 million acres) generally follow the same 25 lb/day casual collection rule as BLM. However, each National Forest Supervisor's Office can restrict collection in specific areas. Always check with the local ranger district before collecting. The Emerald Creek Garnet Area in Idaho's Panhandle National Forest is a famous example of a designated fee-dig site.
What You CAN'T Take — Important Exceptions
Vertebrate fossils (dinosaurs, fish, mammals) on federal land require permits and belong to the government. Archaeological objects (arrowheads, pottery) are protected by federal law — never take them. Crystals in caves and mine tunnels are typically off-limits. Quantities over 25 lbs require a permit — for larger quantities, contact the local BLM field office.
State Land Rules Vary Widely
State trust land, state wildlife management areas, and state parks each have different rules. Most state parks prohibit all collecting. State trust lands in Arizona, Colorado, and other western states often allow collecting with a low-cost recreation permit. Always research the specific land management agency before you go.
How to Find BLM Open Areas
The BLM's online mapping tool (blm.gov) shows land ownership overlaid on topographic maps. The "My Public Lands" app provides offline maps for field use. Pair this with USGS topographic maps and the We Lick Rocks dig site database to identify productive BLM areas near known mineral localities.