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2014-03-07_PERMIT FILE - M2013070
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2014-03-07_PERMIT FILE - M2013070
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Last modified
8/24/2016 5:40:48 PM
Creation date
3/7/2014 3:24:09 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2013070
IBM Index Class Name
PERMIT FILE
Doc Date
3/7/2014
Doc Name
Response to Preliminary Adequacy Review
From
Souder, Miller & Associated for Liberty Mining LLC
To
DRMS
Email Name
GRM
Media Type
D
Archive
No
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Introduction <br />Presented herein is the Conceptual/Preliminary Drainage report for the Liberty Mine. The Report fulfills <br />the requirements, to the best of our knowledge and understanding, of Section 300 of the Mesa County <br />Stormwater Management Manual. The Report is submitted on behalf of Liberty Mine, LLC's, facility <br />owner and operator. <br />PART I - General Site Information <br />The Liberty Mine, formerly the South October Mine, is located in west central Colorado, in Mesa County, <br />southwest of Grand Junction above and west of the Dolores River and Colorado State Highway 141 and <br />immediately east of County Road Z 2.40. The mine portal is at an elevation of approximately 6900 feet <br />above mean sea level. The mine is located in the NW '/4 of the SE '/4 of Section PB- 40(10), T50N, RI 9W, <br />of the NMPM, Mesa County, Colorado and contains approximately 22.66 acres of land. The mine portal <br />is located at Latitude 38° 36' 36.33" N, Longitude 108° 58'4.06'V. See Figure 1- Vicinity and Location <br />Map and Figure 2 -Mine Claim Depiction on the following page for general location for the mine. <br />The general terrain surrounding the mine site is relatively steep surface slopes ranging from near vertical <br />rock outcrop cliffs with slopes of 50 to 99 %, to "bolder strune" foothills with slopes of 5 to 40 percent. <br />See Figure 3 -Area 'Topography for a general depiction of the topography in and around the mine site. The <br />surface area over and around the mine is covered with medium to sparse Juniper and Pinion Trees and <br />sparse natural grasses and other low vegetation. Immediately east of the mine site and down slope of the <br />site, are the near vertical slopes of rock cliffs rising above the Dolores River. <br />The drainage report analyzes the site in two distinct areas; first the surface area over the mineshaft, and <br />second the mine portal, operations area, and the ore stockpile and waste pile areas, herein after referred to <br />as the Operational Area. See Figure 4 — Drainage Basin Delineation and Figure 5- Drainage Basin <br />Delineation Operations Area for a depiction of the 2 areas described. The first area is the undisturbed area <br />above where the mineshaft extends back into the earth west of the mine portal. The second area, the <br />Operational Area, is the disturbed area. The Operations Area includes the mine portal, the portal access <br />road, equipment staging areas, ore stockpile area, waste /over burden or otherwise surplus materials <br />stockpile areas, stormwater holding ponds, and a portion of the mine access roads. See Figure 6 -Mine <br />Operations Area for a general layout of the Operations Area. The Operations Area will have the surface <br />area disturbed from its existing state. <br />The mine has been in existence for several years and much of the operations area has been previously <br />disturbed. Proposed new operations at the site will involve grading and shaping existing roads and access, <br />grading and shaping the staging area, establishing stormwater holding ponds, grading and shaping <br />existing waste materials /over burden stockpiles, expansion of the waste stockpile area, and adding a lined <br />ore stockpile area. <br />PART 11— Existing Site Drainage Conditions <br />As already indicated, the mine has been in existence for several years. Based on existing contour <br />mapping, the drainage around and through the site has been free to follow natural ground slopes with no <br />stormwater management facilities being previously implemented. The surface area above the mineshaft, <br />i.e. the undisturbed area above the mine shaft, provides for runoff water to flow east/northeast down the <br />slope, forming shallow rivulets and channels as it approaches the operations area and the access road. <br />The drainage flows from the hillside above the access road flow into the road alignment where the flow is <br />allowed to sheet flow across the access road and/or is channelized briefly in shallow collection ditches <br />parallel to the road before flowing under the road in culvert pipes before continuing its down slope <br />Figure 1 <br />
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