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• str~_rcttrral high of the La F'lata Mor.rr~tair~s to the r~or•th. The <br />sedimentary rocks of Cretacer_~us age have been deeply incised <br />by erosion. <br />No faulting is apparent ire the permit area b~_rt is r•epor•ted <br />ire the vicinity of the Hesper-~_rs Mirie, .: miles t~~ the <br />r~~=~rtheast. Exp1~=~r•atior~ dr•illir~g by earlier investigators <br />showed r... fa~_rlting in the permit area. <br />Geology cif the permit area ar~d rnir~e ar-e given ire ~. U4. E. <br />Regional geology is shown on Map 5. <br />Ger~er•al Descr•iptior~ of Hydr•ol~~gy <br />The per•rnit area lies in the upper reaches of Hay Gulch and <br />• lies c~r~ the drainage divide between twc~ tr-ib~.rtaries of the <br />Gulch. <br />S~_rr•face Hydr•ology. R11 s~_rr•face r~_rr~c~ff iri ar~d ad,jacer~t to <br />the per•rnit ar-ea is tr•ib~.itar•y to Hay Gulch or• Roberts Car~yor~ <br />(a tr•ib~_rtar-y of Hay G~_rlch), ar~d thence tc~ the La F'lata <br />River. Map 7 shows the r~.rr~off flews ire the rnir~e plan ar~d <br />per•r~rit areas. <br />Average rnor~thly pr-ecipitatior~ arno~.ir~ts ar•e given ire Sectic~r~ <br />~. 04. H. <br />Sub-S~.rrface HydroL_~gy. The La F'lata Coal Corp. mine is not <br />ire a rna.jor• grc~~.rr~dwater r•echar•ge area. Mast c.f the wells ire <br />• the ger~er•al area have been c~~rnpleted ire the ~.rr~c~~r~sc~lidated <br />all~_rvial gravels ~~f the La F'lata river to the west, ar~d a <br />~. i r4-1.' <br />