2020-12-14_PERMIT FILE - C1981019A (2)

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• Se (hot water) • B (hot water) • NO2-NO3 (paste) • Mo (NH4 oxalate) • As, Hg, Pb, Zn, Fe, and Mn (AB -DTPA Extractable) • NP as CaCO3 • Total Sulfur • Sulfur Forms in percent • Acid Generation Potential (AGP), Acid Neutralization Potential (ANP) and Acid Base Potential (ABP) • AGP:ANP Sample Preparation Methods • Air Dry @ 34° C • NH4 oxalate • Crush and Pulverize • AB -DTPA extraction • Hot water extraction • Saturated Paste Extraction • Water extraction RULE 2 PERMITS SM3500-Se.0 EPA Method M6010 ICP EPA Method M353.2 -automated EPA Method M6010 ICP EPA Method M6010 ICP EPA Method M600/2-78-054 3.2.3 EPA Method M600/2-78-054 EPA Method M600/2-78-054 3.2.4 EPA Method M600/2-78-054 1.3 calculation USDA No. 1, 1972 ASA No. 9, Part 2 1965 M 74.2 USDA No. 1, 1972 ASA No. 9, Part 2, 1982 M3-5.2 ASA No. 9, Part 2 1965 M 80-3 USDA Handbook 66, M@ ASA No.9 M10-2.3.2 All of the Divisions's method guidelines were discussed with the laboratory to ensure the proper analysis was being performed to meet the Division's guidelines. Chemical analyses of overburden and interburden strata of the overburden core holes are provided in Voume 17 Exhibit 6, Item 9. Exploration Test Boring Results Summary The data from the drill and core holes for the exploration program in the Collom area showed that the geologic conditions in the Collom pit area are no different than that currently found in the active Colowyo mining area east of the Collom area. Since the geologic conditions of the Collom pit area are similar to the active Colowyo mining area, the data from the Collom overburden sampling is examined using the current Colowyo reporting requirements to the Division. The results of the Collom overburden sampling and analysis are part of the ongoing overburden sampling program at Colowyo. For additional information on overburden characterization please see Volume 15, Section 2.05.3(6). During the handling of overburden in the current mining area, Colowyo monitors the overburden for three parameters. These are pH, sodium adsorption ratio (SAR) and Electrical Conductivity @ 25° C (EC). The reporting limits for these constituents are: • pH - Between 5 and 9 • SAR - > 15 • EC ->12 The plan for the Collom operation is to mine to the Gb seam. The overburden characteristics of the six previously named overburden holes are presented in Exhibit 6, Item 9 (Geology Exhibit 3, Overburden Chemistry). An examination of the overburden characteristics of each core hole, down to the Gb seam, against the limits shown above exhibits the following: Collom — Rule 2, Page 17 Revision Date: 4/7/17 Revision No.: RN -07