Laserfiche WebLink
Revenue Mill 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 />