43 CFR §6302.15

1. (a)You may remove or disturb natural resources for non-commercial purposes in wilderness areas, including prospecting, provided—
   1. (1)You do it in a manner that preserves the wilderness environment, using no more than non-motorized hand tools and causing minimal surface disturbance; and
   2. (2)
      1. (i)Your proposed activity conforms to the applicable management plan; or
      2. (ii)You have a BLM authorization if one is required by statute or regulation.
2. (b)Where BLM allows campfires in a wilderness, you may gather a reasonable amount of wood for use in your campfire.