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2014-09-26_PERMIT FILE - M2014045
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2014-09-26_PERMIT FILE - M2014045
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Last modified
9/6/2020 5:02:32 AM
Creation date
9/29/2014 11:19:15 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2014045
IBM Index Class Name
Permit File
Doc Date
9/26/2014
Doc Name
Acid Rock Report
From
Braun Environmental, Inc.
To
DRMS
Email Name
TC1
Media Type
D
Archive
No
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This test is slightly less rigorous than the test used for landfills that uses glacial acidic acid as the <br /> working fluid. However,that test is designed for material that is to be buried and the test Braun <br /> performed is better suited for material that might have surface exposure. The test was run on a one <br /> kilogram sample split of Sample MH-3 with the sample placed in a water bath having a starting pH of <br /> 6.95. The test sample was agitated once per day for 11 days,and the liquor generated from the material <br /> was tested daily using a pH meter. The results of the test are shown below in Table 2. As can be seen, <br /> the initial pH started at 6.95 and rapidly decreased to the mid-5 range where it reached a low of 5.15 on <br /> day five. From that point,the pH began to slowly increase again reaching 6.31 on the eleventh day of <br /> the test. The data suggests a second order curve asymptotically approaching a pH of 6.36. The test <br /> results showed a slightly higher pH than the meteoric waters which were exposed to the walls of the <br /> shaft. It is noteworthy that this test was performed on a sample that represents the maximum <br /> percentage of sulfide to rock mass found during the investigation, and that this material could not be <br /> easily segregated by normal mining methods to allow its exposure to the environment anyway. <br /> DISCUSSION AND CONCLUSIONS <br /> Braun has performed a site inspection and has tested materials from the Mineral Mountain project area. <br /> It can be globally stated that the rocks making up the Cripple Creek district data are non-acid generating. <br /> This statement is also applicable for the Mineral Hill area as evidenced by the absence of low pH waters, <br /> both surface and subsurface,and the lack of low pH distressed vegetation in areas adjacent to old mine <br /> dumps. <br /> Representative rock samples were collected on the Mineral Mountain site by Braun personnel,and <br /> tested using standard acid based accounting procedures by ACZ Laboratories of Steamboat Springs, <br /> Colorado. ACZ reported that the materials tested ranged from having the potential to generate acid to <br /> having a significant buffering potential. Sample MH-2 exhibited the best buffering capability,while <br /> Sample MH-3 showed the best acid generating potential (not including standards). While Sample MH-3 <br /> appears to have the potential to be an acid generator,a review of the description of that sample shows <br /> it being composed of a one-inch wide vein. This narrow of feature could not be physical mined using <br /> 7 <br />
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