2017-03-27_REVISION - M1981185 (29)

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Exhibit D-Mine Plan Amendment 01 In 2013 the May Day No. 1 portal was stabilized in accordance with TR-1 and used as the primary access to the underground mine workings. The Chief Manway will be used as an emergency escape way and for mine ventilation(Refer to Exhibit D-Figure D-10). The manway was reconstructed in 2016 in accordance with TR 5, TR 7 and TR 8.When necessary, an amendment or TR will be submitted if a surface disturbance activity outside of the affected mine area is anticipated. Other affected mine areas include the Idaho mine area (See Figure D-11) and pre-existing roads (See Figure 12 a and 12 b). When necessary, blasting will be done in accordance with the protocols described in the Geotechnical Stability Exhibit. 6.5.4 and will comply with Mine Safety and Health Administration(MSHA)and the Bureau of Alcohol, Tobacco and Firearms Administration (ATF)requirement. Mining and underground exploration activities work will be performed in accordance with MSHA regulations. The following workers will be engaged in mining activities: • two to three contract workers will be involved in blasting activities; • six to eight workers will conduct exploration and ore production activities; • two to four workers will be involved in ore removal and transport of ore from the mine site to a third party contracted custom mill. Power to the May Day No.1 work area will be provided by 110kW diesel powered generators located at the May Day No. 1 portal. Diesel fuel for May Day Idaho mine complex will be stored and handled in accordance with the Environmental Protection Plan(Exhibit U, Section 6.4.20.7)and MSHA regulations Phase 3-Production Expansion Based on the results of the underground exploration activities,the underground operational area may be expanded. If surface disturbance outside of the existing affected permit area is required, a DRMS permit amendment will be submitted for approval. Phase 4- Mine Completion and Closure At the end of the life of the mine,disturbed areas will be reclaimed in accordance with the approved Reclamation Plan(Exhibit E). Closure of the mine will include demolition of the mine buildings and structures and removal of salvageable material from the permit area.Non-salvageable materials will be buried in place or in the adits and stopes; or, if warranted removed from the permit area and disposed offsite in accordance with all applicable laws, rules, or ordinances. 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 5 of 13