Laserfiche WebLink
fo GEM SERVICES <br /> Dawson Project—Tailings Characterization Page 10 <br /> 25 <br /> c 20 <br /> o - "4:1 <br /> c 15 <br /> v <br /> O <br /> v <br /> f0 •w ► Non-PAG <br /> mo <br /> Y • 2:1 <br /> a <br /> z • <br /> 0 5 • Indeterminate,.._.�-- <br /> �- PAG <br /> 0 <br /> 0.0 Os _.0 15 2.0 25 30 3.5 40 45 . . <br /> AP(<g CaCO,equiv./tonne) <br /> •Tailings •Development Rock <br /> Figure 4: Carbonate NP vs Acidity Potential <br /> The classification criteria are also shown on Figure 4. Material with a neutralization potential <br /> ratio(NP/AP)less than 1 is classified as potentially acidic drainage generating(PAG). Material <br /> with a neutralization potential between 1 and 2 is indeterminate and requires additional <br /> investigation. Material with a neutralization potential greater than 2 is classified non-PAG <br /> (MEND, 2009). These criteria lines are identified in Figure 4 with 1:1 and 2:1,respectively. <br /> Also shown in Figure 4 is the 4:1 neutralization potential ratio line to more clearly show how <br /> distinctly the classification of non-PAG applies. All tailings and development rock samples are <br /> classified as non-potentially acidic drainage generating. <br /> 3.1.3 Solid Phase Elemental Content <br /> The elemental content for tailings is shown in Table 4. The associated Geochemical Abundance <br /> Index(GAI),using crustal abundance as a reference, is given in Table 5. Elemental content and <br /> GAI for development rock is presented in Tables 6 and 7, respectively. Laboratory reports are <br /> provided in Appendix B. <br /> The GAI is a means to compare the concentration of an element in a sample to a reference <br /> material to determine whether an element is significantly enriched and merits further <br /> investigation(INAP,2009). The GAI ranges from 0 to 6,where 0 indicates the element is present <br /> at a concentration similar to or less than the typical abundance and a GAI of 6 represents <br /> approximately a 100-fold or greater enrichment above the typical abundance. A GAI of 3 or <br /> above(12 times or more than typical abundance) is considered significant and may warrant more <br /> detailed investigation(INAP,2009). <br /> DDSMds Zephyr Damon_Teilings_Charecledzatlon FlneLReport,Feb.3,22,1:18 PM Feb 2022 <br />