Feasibility Study and Technical Report - Pretivm

• Further groundwater quality and quantity assessment in the undergroundworkings at closure is required to inform closure and post-closure monitoringand mitigation requirements.• The completion of the EA process under the BCEAA and the CEAA 2012 andother permitting requirements including major permits under the Mines Act andEnvironmental Management Act, among others (estimated cost at $2 million).• The development of a more detailed reclamation and closure plan inconjunction with the EA and Mines Act permitting. The detailed reclamation andclosure plan will require a final site plan and a detailed description of thevarious facilities, as well as project scheduling to provide assurance toregulators that Pretivm has accounted for closure of the Project in mine projectplanning (estimated cost at $60,000).• The continuation with the consultation and the development of a good workingrelationships with local First Nations including the Skii km Lax Ha and TahltanFirst Nation as well as the Nisga’a Nation.26.6.1 GEOCHEMISTRYGiven the preliminary conclusions and the data available to date, the followingrecommendations for the continuing study of the geochemistry at Brucejack are made:• The composition of waste rock (PAG, non-PAG) generated from mining theunderground workings will need to be determined once the mine plan has beenfinalized.• The final mine plan will have to specify the composition of the run of mine (ROM)waste (tailings and waste rock) destined for (1) the underground mine and (2)Brucejack Lake.• Ongoing kinetic tests need to be continued to provide better steady statechemistry data that will be scaled up for use in the water quality model to beupdated in the detailed design and the EA.• Ongoing column tests need to be modified to estimate more accurately the porewater chemistry (tailings and waste rock) and the diffusion of solubleconstituents into the overlying water column.• Paste backfill static tests and kinetic tests will need to be conducted to furtherevaluate the NP contribution of the paste.• The water quality model will need to be updated with relevant information, as itbecomes available.• Site specific guidelines and a compliance point for the site should be developedto properly evaluate the impact mine operations will have on water quality.• Nitrogen species should be incorporated into the model once a blastingschedule is finalized.Pretium Resources Inc. 26-11 1291990200-REP-R0012-02.1Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC