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Technical Memorandum - <br /> Liner Integrity Engineering Support ■ <br /> VLF2 Ore Stacking Recommendations <br /> NewFields Job No.475.0106.023 <br /> April 30,2018 <br /> TABLE 1 <br /> Parameter Value <br /> Maximum Ore depth Over Geomembrane Liner 800 feet <br /> Nominal Ore Angle of Repose Slope 1.4H:1V <br /> Overall Operational Ore Slope against Up-sloping Ground 1.6H:1V <br /> Overall Operational Ore Slope against Down-sloping Ground 2.5H:1V <br /> Overall Operational Ore Slope above PSSA Embankment 2.5H:1V <br /> Overall Operational Ore Slope above Mill 2.0H:1V <br /> Maximum Ore Lift Height with Rocks with a Diameters Less Than 3 inches 100 feet(Note 1) <br /> Maximum Ore Lift Height with Rocks with a Diameter Greater Than 3 inches 50 feet <br /> Minimum Ore Lift Height 20 feet <br /> Minimum Distance between the Crest of a Lift and Placement of Tailings 25 feet <br /> Nominal Ratio of Ore to Tailings Mixture 10% <br /> Note 1: This assumes that an engineered platform or base is available for initial loading(such as the PSSA) <br /> Our most important guideline regarding ore placement is that ore should always be placed in an <br /> uphill direction over the drain cover fill (DCF). Due to the relatively steep slopes at CC&V, any <br /> placement in downhill direction (directly over the DCF) increases the risk of a slide that may <br /> cause damage to the DCF, piping and or geomembrane. <br /> C:\Users\kcwilliams\AppData\Local\Microsoft\Windows\INetCache\Content Outlook\D7BPCP80\VLF2 Ore Stacking Recommendation(002).docx <br /> Page 4 <br />