Most rockhounding in the US happens on Bureau of Land Management land — 245 million acres across the western states, the majority of which allows personal-use collection of rocks, minerals, and gemstones without a permit. The federal rule (43 CFR 8365.1-5(b)) allows "reasonable amounts" for personal, non-commercial use on open BLM land. No registration, no fee. The regulation sets no weight. BLM state offices define "reasonable" themselves: BLM Arizona uses 25 lbs a day and 250 lbs a year, while BLM Oregon/Washington uses what fits in a car trunk, under 250 lbs. The only federal weight limit is for petrified wood: 25 lbs a day plus one piece, 250 lbs a year (43 CFR 3622.4). Our BLM collecting rules guide covers the details.
The complications are the exceptions — and there are enough of them that knowing the baseline rule isn't enough on its own. Mining claims look identical to open BLM land from the road. State parks prohibit collecting almost universally. National parks prohibit it entirely. And on any federal land, vertebrate fossils (bone, teeth, tracks) are separately regulated under federal law regardless of how common or small they look.
