v This report shall only be read in its entirety. File: WAI-985-000-REP-LC-0002_Rev0.docx. 9.1. Options for tailings disposal 50 9.1.1. In-pit disposal 50 9.1.2. Underground paste backfill 51 9.1.3. Central thickened discharge 51 9.1.4. Dry stacks 52 9.1.5. Mixed rock stacks 53 9.1.6. Downstream and centreline embankment dams 53 9.2. Rock disposal options 55 9.2.1. Underground backfill 55 9.2.2. Pit backfill 55 9.2.3. TSF embankments 55 9.2.4. TSF capping 55 9.2.5. Existing stockpiles 55 9.2.6. New rock stacks 56 10.0 OPTIONS FOR ASSESSMENT 57 10.1. Category, Criteria and Weighting 57 10.2. Potential project options 63 10.3. Assessment of Options 72 11.0 PROPOSED WAIHI NORTH PROJECT TAILINGS STORAGE AND ROCK DISPOSAL STRATEGY 74 11.1. Mine Overburden Disposal 74 11.2. Tailings Disposal 74 11.3. Closure 74
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