2011-09-09_REVISION - M1981185 (43)

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Mr. Wallace H. Erickson Response to August 23, 2011 Bird Memorandum September 9, 2011 Page 5 Response to Adequacy Issue No. C.3. The Humidity Cell Test will be conducted as outlined in DRMS' March 25, 2011 adequacy review. The test will be run indefinitely or until notified otherwise by DRMS, and the analyte list will be as described in the March 25, 2011 review. Response to Adequacy Issue No. C.4. Wildcat will use the following analytical methodologies for the "solution characterization method to analyze for pH acidity alkalinity metals anions nitrates minerals cyanides organic carbon and total dissolved solids TDS ": Aqua Regia digestion. Wildcat will perform Aqua Regia digestion, followed by the analyses below. This partial digestion uses a mixture of hydrochloric and nitric acids to dissolve sulphides, some oxides and some altered silicates. Generally base metals will be totally dissolved but this depend on mineralogy. • pH: paste pH; • acidity: EPA 305.2; • alkalinity: AOAC 11.1.05 - Titrimetry; • metals: ICP/MS; • anions: Dionex DX -120 Ion Chromatography; • nitrates: SM 4500- ammonia -ISE; • minerals: XRD with options using electron microprobe, Secondary Ion Mass Spectrometry, MLA (Mineral Liberation Analyzer); • cyanides: SKALAR automated analyzer; • organic carbon: Analyzer; and, • total dissolved solids TDS: ASTM - Conductance. Wildcat commits to consulting with DRMS for all solids tests (e.g., SPLP, humidity cell, acid -base accounting, whole rock analyses, solution characterization methods) prior to the tests to determine appropriate sampling and analytical parameters, including, but not limited to, what is regarded as a representative sample, the appropriate analytical suite for each test, and laboratories that are qualified to perform the tests. Wildcat proposes to analyze pH, acidity, alkalinity, metals anions nitrates, cyanide, organic carbon and total DEN 97,591,783v2 9 -9 -11 GREENBERG TRAURIG, LLP • ATTORNEYS AT LAW • WWW.GTLAW.COM