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REP35589
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REP35589
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Last modified
8/25/2016 12:12:56 AM
Creation date
11/27/2007 7:10:04 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1977215
IBM Index Class Name
Report
Doc Date
4/14/1997
Doc Name
EVALUATION OF UPPER & LOWER TAILINGS PONDS AT BULLDOG MINE
Media Type
D
Archive
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Bul(doR Mine Tailings Ponds Evaluation <br /> <br />ratio of ANP/AGP of greater than 3.0 before materials aze considered to likely be non-acid <br />• generating. <br />Despite their theoretical simplicity, ABA tests cannot in themselves be used to predict the quality <br />of drainage emanating from waste materials at any furure time. Acid generation processes, and <br />therefore drainage quality, are time-dependent, and controlled by a large number of complex <br />factors such as mineralogy, hydrology/climate, and oxygen availability. For this reason, ABA <br />tests should be treated as a qualitative predictive method; that is they can only indicate whether <br />or not there is a potential of net acidity at some unknown time (British Columbia Acid Mine <br />Drainage (BCAMD) Task Force, 1989). <br />Three ABA tests were performed by SVL Laboratories, Kellogg, Idaho on materials recovered <br />from split spoon cores collected at each of the tailings impoundments. Tlie location of the <br />borings aze shown in Figures 3.1 and 3.2 and the depth intervals selected for ABA analyses are <br />shown in Table >.1. The sample intervals were chosen to provide data on the lateral and vertical <br />distribution of types of tailings materials in each impoundment. <br />• The results of ABA analyses of the Bulldog tailings (shown in Table 5.1 and Appendix C) do not <br />meet the State of Nevada or the BLM criteria to be classified as likely non-acid generating. Paste <br />pH values determined during drilling operations and paste pH values determined during the ABA <br />analyses, however, were neutral to alkaline indicating that the tailings in both impoundments <br />have high neutralizing capacities and aze in a neutralizing in-situ setting. The paste pH values <br />measured during drilling operations were determined on tailings from variable depths (shown in <br />Table 5.2) in each exploratory boring by mixing approximately equal parts of tailings with <br />distilled water. The paste pH values of samples collected at the Lower Pond ranged from 6.95 to <br />9.65, and in the Upper Pond paste pH values varied between 6.45 and 8.72 (Table 5.2). The <br />paste pH values determined during ABA testing vaned between 7.74 and 8.49 (Table 5.1). <br />These results indicate that although sulfide minerals are present in the tailings, the rate of sulfide <br />oxidation is negligible compazed to the availability of neutralizing alkaline materials. <br />f, J <br />Homeslake hlinmg Compnm~ Shepherd dhller. Int. <br />eat-.ai~in~~ne.,~.~pr 2S :Ipril IJ. l995 <br />
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