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John M. Clement 12 <br />June 24, 2013 <br />materials on -site resulting from the historic activities. The mine waste observed on surface <br />exhibited potential to generate acid and /or toxic producing materials and be a potential <br />source of acid mine drainage. Please clarify any and all proposed activities which may affect <br />the historic waste rock located on site. If the only proposed activity on the historic waste rock <br />is the maintenance and use of the historic access road, which will be maintained in its historic <br />alignment and configuration, please state such. <br />3. Please discuss the potential for mine drainage from any mine portal associated with the <br />underground activities proposed by the NOI. If the Prospector believes the potential for mine <br />drainage does not exist, please provide information supporting such belief. Please provide <br />information regarding the quality and quantity of mine water located within the existing <br />workings, if any, and demonstrate how operations will be conducted to minimize impacts to <br />the hydrologic balance and be protective of surface and ground water resources. <br />4. The site is perched cliff -side and approximately 1,200 feet upslope of a dwelling structure and <br />Highway 550. The toe of slope of the historic waste rock stockpile terminates at the crest of <br />the cliff, indicating historic activities included end - dumping of waste rock materials. The <br />historic waste materials appear to have settled at the angle of repose. The stability of the <br />historic waste rock material is unknown. The stability of the native rock cliff is unknown. The <br />potential for rock fall appears present, resulting from ground vibrations associated with <br />blasting, rock drilling, and surface grading. <br />Pursuant to Rule 5.3.1, the Prospector is obligated to conduct activities in a manner which <br />protects public health, safety, and the environment. Pursuant to Rule 3.1.5(3), the Prospector <br />must demonstrate how the proposed activities will be conducted to protect areas outside the <br />affected lands from damage. Please state affirmatively whether the proposed activities will <br />include blasting, and if so demonstrate through appropriate blasting, vibration, geotechnical, <br />and structural engineering analysis, that off -site areas will not be adversely affected by <br />blasting and associated rock fall, pursuant to Rule 3.1.5(3). Please provide similar <br />demonstrations addressing any and all proposed activities proximal to the historic waste rock <br />dumps and native rock cliffs. <br />Please note the Division has not yet accepted or approved the Wanakah Mine NO1. At this time you <br />are not authorized to commence the proposed prospecting activities, pursuant to Rule 5.1.3(a). <br />Please contact me at the Division's office in Durango at 691 County Road 233, Suite A -2, Durango, <br />Colorado 81301, phone (970) 247 -5469, if you have any questions. <br />Si n c� r� <br />Wallace H. Erickson <br />Environmental Protection Specialist <br />ec: John Clement, Ouray 79 Mining, LLC <br />Russ Means, DRMS GJFO <br />