2017-03-27_REVISION - M1981185 (29)

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Exhibit D-Mine Plan Amendment place and maintained. As necessary,the May Day No.l (Figure D-6),May Day No. 1 East (Figure D-7) and May Day No. 2 (refer to Figure D-8 and 8a)mine benches will be used to temporarily store ore and waste rock. A Stormwater Management Plan has been approved by the Colorado Department of Public Health and the Environment(CDPHE) (Section 6.4.20.10). In accordance with this Plan; Best Management Practices (BMP) (Exhibit D—Figure D-9)have or are planned to be installed. The BMP control features will include, but are not limited to: • Rolling water bars; • Riprapped and wattle protected runouts; • Crash and erosion barriers; • Vegetated buffer zones; • Silt fences; • Wattles; • Erosion Control Blankets; and • Check dams. C. Ore Stockpile Consolidation and Processing Several historic surface ore stockpiles(referred to as the May Day No.2, Lamb, and Bessie G stockpiles. (See-Exhibit D Figure D-4)will be removed and processed at an offsite custom mill. Phase 2—Underground Exploration and Production Phase: May Day No 1. 0perational Area Underground stockpiled ore within the May Day No. 1 stope (approximately 7,400 CY)and ore stockpiles located near the historic Idaho Mill building(2,500 CY) (Exhibit D-Figure D-4)will be the mining focus during the first two to three years.After ore stockpiles have been removed and offsite custom mill processed, and upon completion of the Phase 2 underground exploration phase, a more detailed mine plan will be developed and, if necessary, an amendment or technical revision(TR-1)will be submitted for approval. The initial underground mining phase will commence in May Day No. 1 utilizing blasting methods,jack legs, and front end loaders. Mine support vehicles will also include excavators, backhoes,front end loaders,rock bolt drills, dozers, pickup trucks, dump trucks and five-25 ton ore haulers. Ore will be hauled from May Day No.l and the Idaho mine area to the base of operation to be loaded into over the road approved haul trucks. Preliminary exploration results indicate ore production will continue for a minimum of 10 years at average rate of 100 tons per day 5 days per week. 6 Ore and Rock storage pads are designed with an impermeable clay liner or 30 mil geotextile. The storage pad will be capable of temporarily storing 500 tons(May Day No.1 and No.2 benches)and 1,000 tons within the base of operations). 112(d)Permit May Day and Idaho Mine and Mill Application M-1981-185 Revised-03.08.2017 Exhibit D—Rule 6.4.4 Page 4 of 13