Oregon on a fed. blm mining site here. Just to be on the safe side (there are alot of places you can cut for firewood but not needled trees, ...madrone and oak...O.K.) I contact the local boss at blm to request someone to come out and approve removal of "hazardous" trees. No matter how small or 150 foot Doug Firs if a tree poises a safety hazard to the mining site, structures or access it should be approved for removal. If (at least in my case) you will cut it and use the wood for perhaps cribbing for your new washplant or "on property" fire wood it will usually be a wash with BLM. Sales is a NO-NO. In other words, use some caution yellow tape and mark the trees to be removed and call BLM. I recently marked about 14 trees, mostly beetle dead 100+ doug firs ( looked like a scene of a crime....HA!) and got approved to wrack all those puppies down. Now don't take me wrong, the old "just cut em down" theory is right up my ally....but doing things that you are empowered to legally do has a special feeling to it and just might get you a bit tighter with your BLM personnel. And remember, no matter how you try to "hide" a freshly cut tree.....a tree guy in either a green or white truck with stuff printed on the doors will know.