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pen Cut Mining <br />• Eligible Lands - Previously mined deposits where no reclamation was <br />completed. <br />• Maximum 3500 cubic yard export. <br />• No onsite processing or sorting. <br />• Offsite impact identification and mitigation plan required. <br />Tier 3 — Limited Impad Operation (Special Use Mining Permit — Environmental <br />Assessment (EA) to NEPA standards, or an acceptable equivalent is required) <br />Hard Rock <br />• Limited Impact Operation (as per MLRB) <br />• No onsite Designated Chemical processing. <br />• Offsite impact identification and mitigation plan required. <br />Placer <br />• Surface disturbance above ordinary high water, as defined by the US Army <br />Corps of Engineers, greater than Ya acre but less than 2 acres. <br />• No onsite Designated Chemical processing. <br />• No material export except metallic ore - bearing rock. <br />• Offsite impact identification and mitigation plan required. <br />Open Cut Mining <br />• Tier 2 Open Cut Permit made available for unlimited renewals via Tier 3 <br />Special Use permitting process. <br />• Onsite processing or sorting permitted <br />• Offsite impact identification and mitigation plan required. <br />Tier 4 — Regular Mining Operation (Special Use Mining Permit — Environmental <br />Impact Statement (EIS) to NEPA standards, or an acceptable equivalent is required) <br />Hard Rock <br />• Regular Mining (as per MLRB) <br />• Offsite impact identification and mitigation plan required. <br />Placer <br />• Surface disturbance above ordinary high water, as defined by the US Army <br />Corps of Engineers, greater than or equal to 2 acres. <br />• No material export except metallic ore - bearing rock. <br />• Offsite impact identification and mitigation plan required. <br />Open Cut Mining <br />• Rock quarry only. Mining of alluvial sand and gravel deposits is prohibited <br />• Offsite impact identification and mitigation plan required. <br />Gilpin County Zoning Regulations Page 48 of 56 <br />