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1998-01-10_REVISION - M1988112
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1998-01-10_REVISION - M1988112
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Entry Properties
Last modified
6/21/2021 10:19:26 AM
Creation date
11/21/2007 1:03:46 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1988112
IBM Index Class Name
Revision
Doc Date
1/10/1998
Doc Name
SAN LUIS PROJECT PERMIT AMENDMENT ADEQUACY RESPONSES M-88-112
From
STEFFEN ROBERTSON & KIRSTEN
To
MLRD
Type & Sequence
AM1
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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1 <br />1 <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br />BATTLE MOUNTAIN RESOURCES, SAN LUIS PROJECT <br />CMLRD ADEQUACY LETTER RESPONSES <br />Page 21 of 28 <br />EXHIBIT E, RECLAMATION PLAN <br />39. It is apparent that detoxification and/or treatment of the tailings <br />material after deposition will be impossible. Therefore, any <br />necessary treatment of the tailings material must be accomplished <br />prior to deposition. In order to determine what, if any, treatment <br />is necessary, geochemical analysis of the material at the point of <br />deposition must be provided. <br />In order to judge whether treatment is necessary, a criteria for <br />evaluation must be established. Our analysis indicates that any <br />seepage or flow from the facility would most likely infiltrate into <br />the colluvial material a short distance from the disposal facility. <br />Therefore, the adopted groundwater standards are applicable to the <br />effluent from the facility. Battle Mountain must demonstrate that <br />impacts to the hydrologic balance are minimized after reclamation <br />is complete. A predictive modes of the effluent, given post <br />reclamation conditions and the geochemical characteristics of the <br />tailings, should be submitted. If the mode) suggests treatment of <br />the tailings prior to deposition is necessary, a plan to do so should <br />also be submitted. <br />' RESPONSE: Geochemical analyses of the discharge slurry are given in Attachment <br />1 and described in Response No. 2. <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br />r During operation, flows from the facilities drainage network will <br />`` be routed to the collection pond. Both quantity and quality of this <br />solution will be monitored during operation. As the tailings facility <br />is operated the rate of drainage will decrease as the tailings <br />adjacent to the drainage network consolidate, reduce in permeability, <br />and drain. At the end of operation, the flow rate is predicted to <br />have decreased to approximately 10 gpm and will continue to decrease <br />following cessation of operation. This prediction is based upon <br />permeability of the tailings reading approximately 10.6 cm/sec. <br />Drainage will also be controlled by the degree of saturation of the <br />tailings adjacent to the drain layer. <br />The proposed reclamation will involve a period of in excess twa years <br />during which time reclamation of the surface of the tailings facility <br />will be performed. The collection pond will be maintained during this <br />phase. Decommissioning of the collection pond is anticipated to be <br />possible at the end of this period as solution flows reduce to <br />nondetectable levels. In the event flow rates do not decrease at the <br />predicted level BMR will maintain the facility until such rates are <br />achieved. <br /> <br />
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