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Mr. Randy McClure/Rio Grande Silver, Inc. 3 <br /> MLI Job No. 3819 -November 26, 2014 <br /> Table 3. -Modified Acid/Base Accounting (Mod ABA) Static ARD <br /> Potential Test Results, Bulldog Project <br /> Paste Sulfur,weight percent(as S) Sulfur,wt.pct.(as S)-HC1 Wash <br /> Sa i.le I.D. .H Total SO. • ritic S- Non-Ext S Non Sulfate S AGP') ANP NNP Ratio SO • 'tic S- Non Sulfate S <br /> BDP-F1391-051113 5.73 0.12 0.07 0.05 <0.01 0.05 1.6 2.0 0.4 1.25 0.08 0.04 0.04 <br /> BDP-ABATC-112213 10.05 <0.01 <0.01 <0.01 <0.01 <0.01 <0.3 15.8 15.8 >52.67 <0.01 <0.01 <0.01 <br /> BDP-TC-112213 11.06 0.01 0.01 <0.01 <0.01 <0.01 <0.3 13.7 13.7 >45.67 0.01 <0.01 <0.01 <br /> BDP-ABATC-11221321 8.19 <0.01 <0.01 <0.01 <0.01 <0.01 <0.3 11.5 11.5 >38.33 <0.01 <0.01 <0.01 <br /> BDP-TCSC-ABA 10.35 0.06 0.03 0.02 <0.01 0.02 0.6 11.6 11.0 19.33 0.03 0.02 0.02 <br /> BDP-TBW-112213 10.09 0.02 0.02 <0.01 <0.01 <0.01 <0.3 3.7 3.7 >12.33 0.02 <0.01 <0.01 <br /> BDP-TBWSC-ABA 10.70 0.02 0.02 <0.01 <0.01 <0.01 <0.3 5.8 5.8 >19.33 0.02 <0.01 <0.01 <br /> BDP-TBWTCSC-ABAMWMP 10.40 0.08 0.05 0.03 <0.01 0.03 0.9 10.5 9.6 11.67 0.06 0.02 0.02 <br /> BDP-TBWTC-ABAMWMP 10.51 0.05 0.03 0.02 <0.01 0.02 0.6 13.2 12.6 22.00 0.03 0.02 0.02 <br /> BDP-TBWTC-HC 9.23 0.05 0.02 0.03 <0.01 0.03 0.9 6.3 5.4 7.00 0.03 0.02 0.02 <br /> I) AGP based on Pyntic S=content (%S=x 31 25) AGP,ANP and NNP in units of tons CaCO,equivalents per 1,000 tons of solids. <br /> 2) Indicates combined sample. <br /> SVL Report#W4E0626,W4G0294,W3H0470,W4B0077 and W4J0355 <br /> METEORIC WATER MOBILITY PROCEDURE (MWMP)AND RESULTS <br /> A standardized column percolation MWMP procedure(ASTM E2242-13)was conducted on the <br /> BDP-TBWTC-ABAMWMP and BDP-TBWTCSC-ABAMWMP samples at a 100%-2" feed size <br /> to assess potential for constituent mobility from the solids by contact with meteoric water. Test <br /> columns (6" I.D. PVC) and associated apparatus were thoroughly washed with detergent, rinsed <br /> with deionized water(DI H20), washed with dilute HC1 solution and rinsed repeatedly with <br /> DI H2O to provide a clean environment for conducting MWMP extractions. Synthetic meteoric <br /> water(DI H2O @-pH 5.97) was used as extraction fluid and was applied at a constant rate until <br /> eluded solution weight was equal to the weight of the dry sample charge. <br /> Effluent volumes were measured by weighing. Solutions were mixed by agitation and effluent <br /> pH was recorded. A 2 L aliquot of each effluent was taken and filtered through a 0.45µm filter <br /> to produce extracts. Extracts were appropriately preserved and submitted to WET Lab for NDEP <br /> profile II plus uranium, ammonia, conductivity and hardness. Column charges were then <br /> allowed to completely drain down and were removed from the test columns and used to <br /> determine residual moisture content. <br /> MWMP extraction test data is provided in Table 4. Profile II analytical results are provided in <br /> Table 5. WET Lab original report sheets for Profile I analyses are included in the Appendix to <br /> this report. <br /> Table 4.-MWMP Extract Test Data,Bulldog Project <br /> Moisture, Distribution, <br /> Temp°C Flow Rate, Extraction Volume,L pH wt.pct. wt.pct.') <br /> Sample I.D. Start End mL/min Time,(hrs) Inf. Eff. Extract Inf. Eff. Extract Feed Residue +2" -2" <br /> BDP-TBWTCSC-ABAMWMP 25.2 24.9 2.1 29.0 2.96 2.96 2.00 5.97 9.64 9.58 1.26 13.28 0.0 100.0 <br /> BDP-TBWTC-ABAMWMP 25.2 24.9 2.1 29.0 2.96 2.95 2.00 5.97 8.85 8.80 0.92 13.80 0.0 100.0 <br /> 1) Distribution before crushing+2"to just pass 2". <br /> McCLELLAND LABORATORIES, INC. <br />