Spills, acid rock drainage, or metal leaching resulting in water and sediment contamination See these data tables for additional information: GRI 303-4 74pan american silver • Sustainability Report 2020 OUR APPROACH We design, build, operate, maintain and close tailings storage facilities, water dams, heap leach pads, and waste stockpiles in accordance with the Towards Sustainable Mining (TSM) Tailings Management Protocol and the Canadian Dam Association (CDA) Guidelines.