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Exhibit D -Mine Plait Anlcndmeut <br />Exhibit D <br />Attachment DA <br />Whole Rock Characterization <br />May Day Idaho Mine Complex <br />La Plata County, Colorado <br />Table of Colltellts <br />13aClCgi'o11I1(1 <br />cated in La <br />ta <br />The operator is Proposing to operate the May Day IdaCollo Mine Complex o ado. The operator is ill the process of <br />County approximately 15 miles west of Durango, <br />activating the Mine Safety and Health Administration (M <br />eHA) act oine identification <br />s will bel mpleme lumber 0 as <br />- <br />03674. When activation has been rock <br />will <br />ed nlme s <br />approved. Representative mine rock will Ue geochemically characterized to determine the <br />potential to be acid or toxic producing. <br />Work Plan <br />Representative channel samples will be obtained consisting ich e . The lsamples ewill be collected and <br />cut into the rock about 4 inches wide and about al P <br />sent to the lab for assaying. In addition representative 30- btu Died afterund 5,000 tong `of nbned ore <br />periodically conducted for laboratory Purposes. Sample <br />will be tested as follows: <br />Whole Rock Analysis: A representative sample will be crushed ill epfoo1 <br />31majlor, 400 <br />mesh and analyzed by standard x-ray fluorescence (XRF) P' <br />minor and trace elements. Testing will also include paste PH/electrical conductivity. <br />1/2 mesh and <br />Acid -Base Accot1111ing: Representative saniples extract will , Totalcrushed <br />Sulf re (lugh�tenlper tore <br />analyzed for pH (1:1 rock: deionlzed «at ) <br />fiirnace Combustion) and CaCO3 (digestion with hot acid, titration with NaOH). <br />(Sobek el. al., 1978); <br />Short term leaching tests will be conducted f leachingo assess the <br />processpresence <br />(SPLP)(ASTM-6234); <br />components using the synthetic precipitate <br />112(4) Permit <br />May Day and Idalio Mine and Mill Application <br />M-1981-185 <br />Revised -01.20.2017 Page 10 of 13 <br />Exhibit D — Rule 6.4.4 <br />