ORS 517.135: Exemption from crimes of mineral trespass and interfering with a mining operation.

(1) ORS 517.128 to 517.133 do not apply to conduct that would otherwise constitute an offense when it is required or authorized by law or judicial decree or is performed by a public servant in the reasonable exercise of official powers, duties or functions. (2) As used in subsection (1) of this section, “laws or judicial decrees” includes but is not limited to: (a) Laws defining duties and functions of public servants; (b) Laws defining duties of private citizens to assist public servants in the performance of certain of their functions; and (c) Judgments and orders of courts. [1999 c.354 §7] MINING USING MOTORIZED EQUIPMENT IN BEDS AND BANKS OF RIVERS