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

Whole Rock Geochemistry-Major Element Analysis for Major Rock Units
Major Element Creede Formation Willow Creek Member*
Si02% 72.5 74.4
A1203% 13.15 11.7
Fe203% 2.24 1.24
CaO% 0.45 0.42
Mg0% 0.45 0.18
Na20% 1 0.59
K20% 8.2 8.6
Cr203% <0.01 <0.01
Ti02% 0.41 0.2
MnO% 0.03 0.1
P205% 0.12 0.04
SrO% 0.01 0.02
Ba0% 0.1 0.07
**L01% 2.45 1.29
Total% 101.11 98.85
Whole rock geochemistry completed by ICP analysis by ALS Laboratories.
Sample preparation completed in Nevada, ICP analysis in Vancouver, BC.
*Analysis completed on sample from Equity Mine roughly 6 miles north.
**L01—Loss on Ignition:analysis conducted by heating(-1000C)or thermo
gravimetric techniques(TGA)that estimates the volatile (water,CO2, etc.)
contents(%weight)of a sample.
Waste Rock Characterization Testing
The geochemical evaluation to support waste rock characterization consisted of the following tests
(details of procedures and parameters as well as complete sample analyses results can be found in the
attached Appendix—McCLELLAND LABORATORIES Interim Report):
o Acid Base Accounting (ABA) to quantify acid neutralization potential (ANP) and acid
generating potential (AGP);
o Meteoric Water Mobility Procedure (MWMP)testing to assess metals mobility potential;
o Humidity Cell Tests(HCT)to simulate weathering allowing further acid generation prediction
and characterization of metals mobility potential.
ABA testing was conducted on all samples. The samples most closely representing the final composition
of the material in the WRSF, Creede Formation and Willow Creek Member, both with and without
shotcrete, were selected for MWMP testing. HCT testing was performed on the Creede Formation
Portal +1391-ft sample and also the composite sample of the Creede Formation and the Willow Creek
Member. Testing is complete for all but the HCT Composite Creede Formation and Willow Creek
Member sample. The following table describes the testing performed on each sample and the
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