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Revenue Milt Certification <br /> 1. Introduction <br /> I, Greg Lewicki, P.E.am one of the principal authors of the DRMS permit for the Revenue Mine and I was integral <br /> in the development of the Environmental Protection Plan measures for the permit,which are included in Exhibit <br /> T of the approved permit(M-2012-032). I have a B.S. in Mining Engineering from Penn State University with <br /> over 37 years' experience in the mining and environmental fields.Of this time, 33 years has been in the western <br /> U.S, primarily in Colorado. I am familiar with all the commitments of the Environmental Protection Plan and I am <br /> qualified to provide certification of the environmental protection items of the mill construction. <br /> As of the date of this report,the mill has been in test operation,where many adjustments were made to the <br /> equipment, chemicals, monitoring procedures and tailings management so that permanent operation can take <br /> place.As part of this Mill Certification, representative tailings samples have been tested with the SPLP <br /> procedure,and have passed the requirements.Also,the downstream wells at the toe of the tailings <br /> embankments have met the chemical parameters.Therefore, upon approval of this Certification,the mill will be <br /> allowed to be in full operation, and tailings will be allowed to be permanently placed in the approved tailings <br /> embankments(Revenue Pile or Atlas Pile). This Certification applies only to the environmental protection items <br /> of the mill; it does not apply to other environmental items of the mine permit. It also does not apply to the <br /> engineering details of the milling equipment,which was designed by CH2MHill. <br /> This Certification document is meant to satisfy the requirements of Rule 7.4 of the Hard Rock/Metal Mining <br /> Rules. <br /> 2. Mill Design Discussion <br /> From its initial design,the Revenue Mill has been planned to be an underground mill of approximately 400 tons <br /> per day of ore capacity.All new excavations were blasted for the four tunnels that constitute the mill complex. <br /> These are a)the mine car unloading tunnel, with slusher to coarse ore bin b)the crushing gallery with conveyor <br /> leading to the mill tunnel via the Fine Ore Bin Incline,c)the mill tunnel which leads to the filter building at the <br /> outside edge of the mill tunnel and d)the decline tunnel, which provides equipment access to the crushing <br /> Revenue Mill Certification Page 3 of 20 <br />