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2011-03-14_REVISION - M1977493 (62)
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2011-03-14_REVISION - M1977493 (62)
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Last modified
6/15/2021 5:47:16 PM
Creation date
4/12/2011 12:34:40 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977493
IBM Index Class Name
REVISION
Doc Date
3/14/2011
Doc Name
Exhibit List, Exs. 68 & 69
From
Climax
To
MLRB
Type & Sequence
AM6
Media Type
D
Archive
No
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CM0001630 <br />Page 2 <br />2.0 SITE CONDITIONS <br />The ERV is positioned northwest of the Climax Mine and is located at the headwaters of the East <br />Fork of the Eagle River in Eagle County, Colorado. The average elevation within the valley is <br />. = approximately 10,900 feet above mean sea level (msl). <br />A site map of the ERV is shown on Figure 1. The ERV covers an area of approximately 300 <br />t acres and is bounded on the north and south by bedrock exposures of the Minturn Formation and <br />Tertiary-aged quartz monzonite intrusives. The valley is filled with glacial soil deposits ranging <br />in thickness from 0 to over 80 feet. Figure 2 shows the configuration of the top of the bedrock <br />within the ERV. This surface was defined by over 140 test borings and pits used to define <br />subsurface conditions for construction of the No. 1 Tailing Dam, Robinson Lake, Eagle Park <br />Reservoir, and Chalk Mountain Reservoir. <br />Site features within the ERV which may require reclamation are: <br />i <br />• Eagle Park Reservoir, <br />• Seep Water Related to No. 1 Tailing Dam, <br />• Robinson Lake, and <br />• Chalk Mountain Reservoir. <br />A description of these features, and summary of reclamation related issues, are presented in the <br />following sections. <br />Eagle Park Reservoir <br />Eagle Park Reservoir covers a 59-acre area and has a storage capacity of approximately 2,880 <br />acre-feet (Wheeler, 1994). The reservoir dam was originally designed to be constructed in three <br />stages with dam crest elevations at 10,705, 10,745 and 10,790 feet msl for stages 1, 2, and 3, <br />respectively. The first stage was completed in October of 1966. However, changes in mill <br />operations ended the need for additional storage and stage 2 was modified prior to construction, <br />11 reducing the dam crest elevation from 10,745 to 10,725 feet. The existing dam was completed <br />in 1968. <br />The dam was designed as a zoned earthen embankment with a central impervious core, and <br />upstream and downstream zones of random pervious and semipervious material, and a sand/gravel <br />drainage blanket. A cutoff trench was excavated into the weathered bedrock beneath the dam. <br />L Construction records indicate the cutoff trench was up to 80 feet deep in the valley bottom <br />(WCC, 1978). The trench was backfilled with material similar to the central core. <br />c <br /> <br />Oxide tailing from the mill was deposited in the Eagle Park Reservoir beginning in the summer <br />of 1967. Oxide tailing deposition continued until late 1968 when it was stopped due to changes <br />in mill operations. The total volume of oxide tailing deposited in Eagle Park Reservoir is <br />?. =0== == <br />Environmental <br />
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