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Exhibit D-Mine Plan Amendment <br /> Exhibit D <br /> Attachment 1 <br /> Whole Rock Characterization <br /> May Day Idaho Mine Complex <br /> La Plata County, Colorado <br /> Table of Contents <br /> Background <br /> The Operator is proposing to operate the May Day Idaho Mine Complex located in La Plata <br /> County approximately 15 miles west of Durango, Colorado. The Operator is in the process of <br /> activating the Mine Safety and Health Administration(MSHA)mine identification number 05- <br /> 03674. When activation has been approved mine site corrective actions will be implemented as <br /> approved. Representative mine rock will be geochemically characterized to determine the <br /> potential to be acid or toxic producing. <br /> Work Plan <br /> Representative channel samples will be obtained consisting of cuttings collected from a groove <br /> cut into the rock about 4 inches wide and about an inch deep. The samples will be collected and <br /> sent to the lab for assaying. In addition representative 30-50 pound bulk sampling will be <br /> periodically collected for laboratory purposes. Samples obtained after 5,000 tons of mined ore <br /> will be tested as follows: <br /> • Whole Rock Analysis: A representative sample will be crushed to approximately-400 <br /> mesh and analyzed by standard x-ray fluorescence (XRF)procedure for 31 major, <br /> minor and trace elements. Testing will also include paste pIvelectrical conductivity. <br /> • Acid-Base Accounting: Representative samples will be crushed to -2%2 mesh and <br /> analyzed for pH (1:1 rock: deionized water extract),Total Sulfur(high-temperature <br /> furnace Combustion) and CaCO3 (digestion with hot acid,titration with NaOH). <br /> (Sobek et. al., 1978); <br /> • Short term leaching tests will be conducted to assess the presence of readily soluble <br /> components using the synthetic precipitation leaching process (SPLP)(ASTM-6234); <br /> 112(d)Permit <br /> May Day and Idaho Mine and Mill Application <br /> M-1981-185 <br /> Revised-03.08.2017 <br /> Exhibit D—Rule 6.4.4 Page 10 of 13 <br />