Surface Mining Permitting Process Mineral Land ...
Dec 23, 2019· Exclusion Certificate . Exclusion certificates are required for mining activity that removes less than 5,000 cubic yards and affects less than one acre of land within a 12month period. Operating Permits are required for mining activities above these thresholds. The Exclusion Certificate program was established by the Oregon Legislature in 2015, and is in statute as ORS
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