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b., <br />-49- <br />rock at the time of final disposal will be almost completely under the <br />influence of energy gradients such as those which result from <br />moisture, temperature and vapor pressure differentials. Localized <br />migration of moisture within the leached rods and the adjacent bedrock <br />material will occur over long periods of time. However, no <br />significant quantities of moisture will be available to seep from the <br />disposal area. <br />RECLAMATION <br />Subsurface Disposal Area: An Agreement signed by the Gates & Fox <br />Company, Inc. with ERDA on June 25, 1976, contains an exception to the <br />filed mine plan. Approval was not given to a portion of the Gates & <br />Fox mine plan, which stated ". . . Eventually underground waste <br />developed during the mining of this ore body and not necessary to be <br />foisted, will be wasted underground in worked out rooms <br />- - ." The <br />agreement stated that underground disposal of waste developed during <br />the mining process was not approved and that it might be approved <br />later by the contracting officer or his authorized representatives <br />when requested. <br />Based on the information presented above, it appears that it <br />will be necessary to obtain approval from ERDA to dispose of the <br /><<cessed low -grade ore in the mine workings. In our <br />opinion, <br />.isfactory reclamation of the deep subsurface disposal site can be <br />'sieved by providing an impermeable bulkhead at the end of the waste <br />f k <br />4 •1‹ disposal areas which will be exposed for long periods of time <br />:.g the mine operation or at the completion of mining. The <br />