SMARA established thresholds of one acre of surface disturbance and/or a surface excavation of 1,000 cubic yards. Mining operations that exceed either of these thresholds are required to obtain a Mining Conditional Use Permit and/or a Reclamation Plan approval from the County prior to initiating operations. For underground mines, these thresholds apply to any surface disturbance activities associated with the underground development including access to the mine, ore and overburden stockpiles and milling. You should be aware that SMARA has exempted certain types of mining operations. Please refer to SMARA Section 2714 and determine if your proposed activity is consistent with one of these exemptions.