2014-12-29_REPORT - M1977215

• Permit No: M1977215
• IBM Index Class Name: Report
• Doc Date: 12/29/2014
• Doc Name: Interim Waste Rock Characterization Summary, 1.
• From: Rio Grande Silver, Inc.
• To: DRMS
• Email Name: RCO
• Media Type: D
• Archive: No

Mr. Randy McClure/Rio Grande Silver, Inc. 2
MLI Job No. 3819 -November 26, 2014
Table 1. - Composite Make-up Table,Bulldog Project
Split Wt(kg)to composite Total
BDP-TBW- BDP-SC- BDP-ABATC-112213/ BDP-F1391- Comp
Sample I.D. 112213 112213 BDP-TBW-112213 051113 Wt.,kg
BDP-TBW-I 12213 0.250 0.250
BDP-TBWSC-ABA 0.243 0.008 0.251
BDP-TCSC-ABA 0.006 0.097 0.097 0.200
BDP-TBWTC-ABAMWMP 0.805 1.348 1.348 3.501
BDP-TBWTCSC-ABAMWMP 0.753 0.105 1.321 1.321 3.500
BDP-TBWTC-HC 0.575 0.119 0.963 0.963 2.620
Table 2. - Split Weights for Various Tests and Analyses,Bulldog Project
Split Weights,kg-by Test/Analysis Type
Sample I.D. ABA MWMP Humidity Cell
BDP-F1391-051113 0.25 1.5
BDP-ABATC-112213 0.25
BDP-TC-112213 0.25
BDP-ABATC-112213' 0.25
BDP-TCSC-ABA 0.25
BDP-TBW-112213 0.25
BDP-TBWSC-ABA 0.25
BDP-TBWTCSC-ABAMWMP 0.25 3.00
BDP-TBWTC-ABAMWMP 0.25 3.00
BDP-TBWTC-HC 0.25 2.0
* Indicates combined sample.
Mod ABA static ARD potential tests were conducted on each sample to assess potential of the
solids to generate or neutralize acid in a natural weathering and oxidizing environment.
Mod ABA results show that all samples displayed a greater potential to neutralize than to
generate acid in a natural environment. Results are summarized as follows:
• Paste pH's ranged from 5.73 to 11.06.
• Pyritic sulfide from<0.01 to 0.05 wt. pct., and resulted in AGP values ranging from<0.3 to
1.6 tons CaCO3 equivalents per 1,000 tons of solids.
• ANP values ranged from 2.0 to 15.8 CaCO3/1,000 tons.
• NNP values ranged from 0.4 to 15.8 CaCO3/1,000 tons.
• Ratios(ANP -AGP)ranged from 1.25 to >52.67.
Mod ABA static ARD potential test results are provided in Table 3. The SVL lab report for
Mod ABA is provided in the Appendix to this report.
McCLELLAND LABORATORIES, INC.