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BUREAU OF r.mIES OWNERSHIP A check of Federal Dlats at the Bureau of Land r.~enageroent revealed that there are no patented !"lining claims anywhere near the resenoir area. Plat books at the NontezUIl!8. County courthouse sllow all lands in secs. 23,24,25,26,35. and 36, T. 39 N.. R. 18 H., and secs. 19. 20, 29,30, 31, 8Ild 32, T. 39 Tr., R. 17 H., are privately owned. ~'Pending upon the date and terms of the patent. mineral rights may or J1l8..V not have been con- veyed frOIl'. the Federal eovernment. Abstracts of title for indiviC:ual tracts vere not examined for this iten. It was ass~ed that mineral rights vent vith the surface; therefore, the area wa$ not open to staking of mining claims. To check this factor, several local residents 'Were asked if they knew of any mining claim locations in the near vicinity; no one did. Hooded areas weTe examined for claim corners, discovery pits, and bul.ldczer trenChing, but none vas found. DESCRIPTIOU OF DAB Mm nSERVOIR ,.~' ) Cahone D8.Il1 is one of a. series planned for developing vater resources of the Dolores River in southwestern Colorado. AB proposed, the reservoir would ha.<fe a normal wat.er surface altitude of 6,822.5 feet and an active capacity of approximately 4 ,000 acre~:feet. The dBJJl ...,ould be an earthfill structure approximately 2,000 feet long an~ 75 feet high (figs. 3 and 4). Hater would flow into the reservoir by cllDal from EcPhee Reservoir on the Dolores River. All waters would be for irrigEl,tion; power vould not be a consideration. The draina.ge basin behina the aan woula be too limited in area for the dam to have any flood-control value. GEOLOGY As indicated by fie:ure 5, only the Dakota formation is elq)osed in the dam and reservoir areas. The lovest present exposures. located. in the canyon botto~ at the dam axis, reveal sandstones, carbonaceous shales. and l01f-crade subbituminous cocl. It is aSS1,.lllJed that the buff sandstones snd gray shales, exposed in a borrow cut just west of the axis of the dam, extend throueh the smell reservoir area (fig. 6). Recent aeolian deposits of red-brown., sandy, leell clay cover It!ost of the area. This 18 the material that forms the farm soil and alBo effec_ tively covers all of the older depositB. Auger tests by the Bureau of Reclamation indicate that this material bas a r.J/lXimum thickness of 15 feet and has a probable averace. tt'.ioe.r.t\.'a$'! I;)f ~ 'to ') feet. As indicated by structure contours on the buse of the Dakota forma_ tion. shown in figure 5. thi$ proposed reservoir lies on the axis of a 99 ,."