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MAY DAY IDAHO MINE COMPLEX <br />M 1981 185,112d 2 AMENDMENT (AM -2) APPLICATION <br />SUNRISE MINING, LLC <br />Exhibit D <br />Attachment D-3 <br />Whole Rock Characterization <br />Background <br />Sunrise is proposing to operate the May Day Idaho Mine Complex located in La Plata County <br />approximately 15 miles west of Durango, Colorado. Sunrise is in the process of activating the Mine <br />Safety and Health Administration (MSHA) mine identification number 05-03674. When activation has <br />been approved, mine site corrective actions will be implemented as approved. Representative mine rock <br />will be geochemically characterized to determine the potential to be acid or toxic producing. <br />Work Plan <br />Representative channel samples will be obtained consisting of cuttings collected from a groove cut into <br />llected and sent to the lab for <br />the rock about 4 inches wide and about an inch deep. The samples will be co <br />assaying. In addition, representative 30-50 pound bulk sampling will be periodically collected for <br />laboratory purposes. Samples obtained after 5,000 tons of mined ore will be tested as follows: <br />• Whole Rock Analysis: A representative sample will be crushed to approximately -400 mesh <br />and analyzed by standard x-ray fluorescence (XRF) procedure for 31 major, minor and trace <br />elements. Testing will also include paste pH/electrical conductivity. <br />• Acid -Base Accounting: Representative samples will be crushed to -21/2 mesh and analyzed for <br />pH (1:1 rock: deionized water extract), Total Sulfur (high-temperature furnace Combustion) <br />and CaCO3 (digestion with hot acid, titration with NaOH). (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 />Conduct a humidity cell test to empirically assess the relationship, under laboratory <br />conditions, between drainage quality and Laboratlid phase ory Weathering of Sold osition 1ng procedures Materials Using atlined <br />in ASTM D-5744 (Test Methodfor <br />Humidity Cell.) <br />For all solids tests (e.g., SPLP, humidity cell, acid-base accounting, whole rock analyses, <br />solution characterization methods. Sunrise will include sulfide sulfur in the ABA <br />protocol which will also quantifies AP, NP, Net NP, paste pH and acid soluble sulfate and <br />sulfide. <br />14 <br />