ORS 275.300

In any conveyance or agreement for conveyance of any minerals, or other interest, less than the whole fee, in any lands acquired by any county by foreclosure of delinquent tax liens or otherwise under ORS 275.090 to 275.220, the governing body of the county may provide such conditions and regulations as may be deemed to be for the best interests of the county and may require of the purchaser a satisfactory bond or undertaking in the name of the county in an amount not less than the whole purchase price of such minerals or other interests in such lands, conditioned upon the compliance of the purchaser with such conditions and regulations.