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Exhibit D-Mine Plan Amendment <br /> i I <br /> Exhibit 1) <br /> Attachment I <br /> Whole Rocic 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 Nine 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. \'lien 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 conducted for laboratory purposes. Samples obtained after 5,000 tons of mined ore <br /> will be tested as follows: <br /> © NSIhole 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 plVelectrical conductivity. <br /> ® Acid-Base Accounting: Representative samples will be crushed to -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 /> o Short term leaching tests will be conducted to assess the presence of readily soluble <br /> components using the synthetic precipitation leaching process(SPLP)(AS"I'M-6234); <br /> 112(d)Permit <br /> May Day and Idalio Mine and Mill Application <br /> M-1981-185 <br /> Revised -01.20.2017 <br /> Exhibit D—Rule 6.4.4 Page 10 of 13 <br />