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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />November 5, 2015 <br />Patrick Maher <br />Venture Resources Inc. <br />P.O. Box 1974 <br />Idaho Springs, CO 80452 <br />RE: Hukill Gulch Millsite; DRMS File No. M-2009-076; Technical Revision No. 1 — <br />Adequacy Review No. 1 <br />Dear Mr. Maher, <br />The Division of Reclamation, Mining and Safety (Division) received Technical Revision No. 1 <br />for the above referenced site on October 29, 2015. The decision date for this Technical Revision <br />is November 30, 2015. The Division has reviewed the Technical Revision Application and has <br />the following comments: <br />1. The Operator has submitted a Weed Control Plan for the management of diffuse knapweed. <br />In addition to diffuse knapweed, the Division requested the Operator provide a list of noxious <br />weed species which may potentially occur at the site. The Division has attached a list of <br />noxious weeds which are known to occur in Clear Creek County. Please commit to <br />monitoring for the presence of these noxious weed species. <br />2. The Weed Control Plan specifies that diffuse knapweed will be treated in the spring and fall. <br />Diffuse knapweed produces seed at a prolific rate and as a result builds up a seed bank in the <br />soil. Continued monitoring is required even after initial control has been achieved. Please <br />provide a commitment to conduct annual monitoring of noxious weeds in both the spring and <br />fall. <br />3. Evaluation is a critical part of a Weed Control Plan and must be done to determine the <br />effectiveness of weed control efforts. Noxious weeds may not respond to weed control efforts <br />for a variety of reasons. Repeated use of herbicides with the same mode of action can lead to <br />herbicide resistant weeds. Therefore, it is important to evaluate the effectiveness of herbicide <br />applications. Evaluation may be as simple as walking the property and visually surveying the <br />treatment areas after an herbicide application has occurred. Please commit to evaluating the <br />treatment areas after an herbicide application. <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor 1 Mike King, Executive Director 1 Virginia Brannon, Director <br />