Feasibility Study and Technical Report - Pretivm

The 2009 to 2010 test results indicated that most of the samples responded well togravity concentration, especially the reground flotation concentrates (Table 13.19). Forthe flotation concentrates produced from the zone composite sample, approximately 29to 45% of the gold was recovered into the gravity concentrates containing over 1,000 g/tgold; however, metallurgical responses for silver were not the same as for gold.The test results also indicated that some of the samples (such as the SU-36B sample)were less amenable to the gravity concentration process.Table 13.19 Gravity Concentration Test Results (2009 to 2010)TestIDSampleIDPrimary Grind/Regrind SizeGrade (g/t) Recovery (%)Au Ag Au AgGF35 BZ P80 131 µm 685 428 17.0 4.6GF37 R8 P80 116 µm 70.5 677 2.7 1.8GF36 GH P80 116 µm 158 495 11.0 1.8GF41 GH P80 116 µm 331 339 25.7 1.4FG38 R8 P80