Oregon Revised Statutes Mineral Resources § 517.855

(1) Any portion of a mining property that is preserved from mining, including, but not limited to, a setback, buffer zone or no-impact area, may be excavated, reduced, added to, elevated, reshaped, contoured, graded or otherwise disrupted for the purpose of facilitating the reclamation of the mined area or integrating the reclaimed area with its surroundings.

(2) Subsection (1) of this section does not permit the removal for profit of any valuable mineral.