Oregon Revised Statutes Mineral Resources § 517.046

(1) Unless the claim for placer deposit referred to in ORS 517.044 is located by legal subdivisions, the surface boundaries of the claim must be marked so that the same may be readily traced. Such boundaries shall be marked within 30 days after the posting of the notice described in ORS 517.044 by substantial posts or other monuments of the same size, materials and dimensions as in the case of quartz claims. The boundaries of the claim shall be marked at each corner or angle, and, when any side or end of the claim extends for more than 1,320 feet without a corner or angle, then at intervals of not less than 1,320 feet along such side or end.

(2) Where the claim for placer deposit referred to in ORS 517.044 is taken by legal subdivisions, no other reference in the notice of claim required to be posted and filed under the provisions of ORS 517.042 to 517.052 than to the legal subdivisions shall be required and the boundaries of a claim so located and described need not be staked or monumented. The description by legal subdivisions in the notice required to be filed under ORS 517.052 shall be deemed the equivalent of marking the surface boundaries of the claim.