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REV14167
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REV14167
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Entry Properties
Last modified
8/25/2016 1:25:20 AM
Creation date
11/21/2007 10:49:11 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1981165
IBM Index Class Name
Revision
Doc Date
1/26/1996
Doc Name
NEGLECTED MINE PN M-81-165 CN-001 ADEQUACY REVIEW
From
MINE DEVELOPMENT INC
To
DMG
Type & Sequence
CN1
Media Type
D
Archive
No
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<br />Again, the stope MDI is going to use is dry and remains that way throughout the entire <br />season. Since MDI is going to be required to monitor water quality periodically and our <br />baseline samples are indicating compliance with chronic aquatic life standards, would it <br />make sense to let continued compliance serve as a testament to the fact that our <br />tailings have been securely disposed of in the stope? <br />MDI sincerely believes that it can rely on the operators knowledge of the Neglected <br />Mine and its history to guide MDI through these responses. Mr. Harold Luzar Jr., <br />MDI's Operator, has been underground to survey the Neglected site many times, <br />especially the 65, 85, and 125 foot levels. He has never encountered difficulties <br />traversing these levels due to water, in fact, the lack thereof made surveying easier. <br />MDI has requested and will submit any information regarding water levels as soon as it <br />receives any. But, since there is such a lack of an abundance of such material MDI has <br />had to substitute information from personal physical inspections of the Neglected mine. <br />10. What is the expected volume of the new tailings pond, and how long will it <br />take to fill to capacity at the proposed production rate? Do the tailings pond <br />designs allow for freeboard to accommodate water accumulation from major <br />precipitation events when the pond is filled to capacity?. If so, how much <br />freeboard is designed into the structure, and what precipitation event is it <br />designed to contain? <br />The volume for the tailings pond is 67,900 ft'. By MDI's calculations, running at <br />maximum capacity, the tailings pond will contain the maximum amount of tailings after a <br />season and a half, at which time disposal will begin. Our calculations did allow for three <br />feet of freeboard, and storage of process water during the winter. The percentage <br />breakdown of the different volumes occupied in the pond are roughly as follows: <br />process water storage 8%, three feet of freeboard 29%, and tailings storage 63%. <br />Three feet of freeboard is sufficient enough to contain a 100 year 24 hour rainfall event, <br />which would yield approximately 4.5 inches of rain. This information was found on the <br />United States Soil Conservation Service Isopluvial curves for the State of Colorado. <br />11. Will the tailings pond be emptied of all tailings before site shutdown each <br />fall? <br />Not necessarily, it will be emptied as the tails start to occupy more than 63% of the <br />volume. <br />Phase II <br />12. The application does not discuss characterization or disposal of waste rock <br />produced by the mining process. Please provide this information and address <br />the potential of the waste rock to produce toxic or acid mine drainage. If the <br />wasterock is to remain underground, please show where it will be stored, <br />
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