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BEFORE THE DIVISION OF RECLAMATION,MINING AND SAFETY <br /> STATE OF COLORADO <br /> RE: CROSS GOLD MINE, PERMIT NO. M-1977-410, PRELIMINARY DESIGNATED <br /> MINING OPERATION DETERMINATION <br /> AFFIDAVIT IN SUPPORT OF GRAND ISLAND RESOURCES, LLC'S APPEAL <br /> STATE OF COLORADO ) <br /> ) SS. <br /> COUNTY OF BOULDER ) <br /> I, Sean Muller, being over the age of eighteen, being first duty sworn on oath, state as follows: <br /> 1. My name is Sean Muller. I am the Geology Manager for Grand Island Resources, LLC. <br /> My experience at the Cross Mine goes back to 2010 when I worked with the previous <br /> mine owner,Tom Hendricks. <br /> 2. I have a Bachelors in Earth Science/Biology and a Masters in Economic Geology. I <br /> started my PhD in Mining Engineering in 2010 at the Colorado School of Mines with a <br /> thesis topic at the mine. I have 49 years of mining and environmental experience starting <br /> my career in metallurgy then moving into exploration, operations and environmental <br /> characterization plus remedial design. During the 1990s when the metals market crashed, <br /> I worked in aqueous phase geochemistry for characterizing the Superfund cleanup of <br /> about 20 Anaconda mines, mills, and smelters. This diverse technical expertise gives me <br /> a full understanding of the processes and potential impacts of mining and future <br /> reclamation. <br /> 3. Effluent discharge from the Cross and Caribou mines has occurred since the 1870s and <br /> there are perhaps 30 legacy mines in the Coon Track Creek drainage where there is no <br /> evidence of acid mine drainage (AMD). Significant is the fact that through this 150 <br /> years, waste rock piles around these legacy mines have had no AMD seepage. The <br /> reason for this is explained in the Acid Base Accounting tests conducted on ore and <br /> evaluated in a TCLP generated leachate in 1994 and 1995. These tests were conducted <br /> after the Designated Mining Operation (DMO)rule came into effect. At that time, DNR <br /> asked all of the mining companies to prove they are not a DMO. In 1995, DNR after <br /> reviewing the analytical testing provided by Core Laboratories, concluded that the ore <br /> and leachate had no indication of being acid generating. Monzonite is the host rock for <br /> the sulfide veins and it has a very high neutralization potential. Even sulfide-laden waste <br /> rock at these legacy mines are non-acid generating. <br /> 4. A comprehensive file of all chemicals stored or used at the permitted mine site is <br /> maintained in the Cross-Caribou Mine's records labeled "Safety Data Sheets. No <br /> Page 1 of 3 <br /> COR F13 5 2 2586.0004/173 273211 I <br />