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APPCOR11485
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APPCOR11485
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Last modified
8/24/2016 6:31:52 PM
Creation date
11/19/2007 2:20:37 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
Application Correspondence
Doc Date
1/19/1995
Doc Name
YOAST MINE C-94-082 APPLICATION REVIEW COMMENTS
From
DMG
To
SUSAN BURGMAIER
Media Type
D
Archive
No
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III IIIIIIIIIIIIIIII <br />- 999 <br />• • <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenl of Natural Resources <br />131 3 Sherman Si., Room 215 <br />Denver, Colorado 80207 <br />Phone: (3071 866-3567 <br />FAX (30J) 8328106 <br />To: Susan Burgmaier, Environmental Protection Specialist <br />From: Bruce Stover, Technical Support <br />Date: January 19, 1995 <br />Re: C-94-082 Yoast Mine Application Review Comments <br />II~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames 5. Lochhead <br />EeecWive Director <br />Michael B. Lang <br />Division Dnecror <br />I have reviewed Tabs 6, 12, 13, and 20, as well as discussing certain aspects of Tabs 7, 15, <br />16, and 17 with Barbara Pavlik. Additionally, I have compiled a preliminary landslide <br />geologic map of the permit area from the aerial photographs you provided. The following <br />are my comments and questions on the adequacy of the application. <br />Tab 6 Geology and Overburden Assessment <br />' The bedrock geologic mapping is adequate, however, the engineering/surficial <br />geologic mapping provided is not. Exhibit 13-12 does not show surfical materials <br />such as landslides and thick colluvium which will affect mining, some facilities, and <br />potential slope stability during the mining and post mining period. (Please see <br />attached preliminary photo-interpretive map). There appear to be some areas of <br />landslide deposits ranging from very old, to active/very young, which will have a <br />bearing on mining and development of certain parts of the permit area. In order to <br />evaluate specific siting and mining alternatives, these deposits/features should be <br />shown on the surfical geologic mapping, and be incorporated into the permit <br />documents. <br />Tab 12 Mining Plan <br />' As noted above, there are some areas of landslides which will potentially affect the <br />plan, but which are not discussed or recognized in the permit documents at this time. <br />These areas should be delineated, and the mining plan should address how <br />potentially unstable areas and active landslide areas will be affected/ mitigated <br />during the mining operations, specifically: <br />• The "neck pit" will be developed through a significant landslide/colluvial <br />deposit which could adversely affect pit wall stability, and future topsoil <br />stockpile locations. <br />• A potentially unstable area on the west upper slopes and gulch of the pond <br />011 drainage could impact road or ditch construction. The 1999 pit could <br />
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