Feasibility Study and Technical Report - Pretivm

• wildlife management• waste management• archaeological and heritage site protection.Two employees, on a rotational basis, will be required for environmental monitoringincluding:• federal MMER monitoring requirements• permit and license compliance monitoring• environmental effects monitoring• reclamation research and monitoring.Pretivm’s environmental staff, supported by specialist consultants, will also research andadvise the Mine Manager on alternative mitigation strategies as part of the mine’sprocess of continual improvement. Outside laboratories will be required for someanalyses while more routine analyses will be done in-house, such as conventional watersample analysis. Resources will be required for ongoing equipment upgrades andreplacement, specialized equipment procurement, helicopter support, and mitigation andreclamation research.20.1.4 ACID ROCK DRAINAGE/METAL LEACHINGBGC completed an assessment of the ARD/ML characteristics of waste materials (wasterock and tailings) that will be generated at the Property. This assessment was required todetermine if waste materials will generate ARD and cause ML, so that appropriate wastemanagement strategies can be developed for the site. The assessment included:• a review of drill core logs to select waste rock samples• static tests (acid base accounting (ABA) data and elemental analysis) on thecollected samples• kinetic tests (humidity cells and subaqueous columns) on the collected samples• analysis and reporting of the test results.The following sections provide a brief summary of the key components to the ARD/MLassessment. BGC (2013) describes an in-depth discussion of the Brucejack ARD/MLtesting program.ACID BASE ACCOUNTINGABA data are used to assess the neutralization potential ratio (NPR) of waste materials inorder to determine which materials are classified as PAG. Static tests were carried out in2011 (using 150 samples) and 2012 (using 241 samples) on material collected fromdrill cores across the Project site. In addition, ABA tests were conducted on flotationtailings samples generated from the VOK Zone and West Zone ore. A frequency analysisPretium Resources Inc. 20-9 1291990200-REP-R0012-02.1Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC