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. . ~-- . 4208 All of the Fryingpan-Arkansas Project tunnels are located in igneous and metamorphic rocks and lie outside of the mineral- ized zone. Geologists involved in the preconstruction geologic investigations of the tunnel alinements expressed their amazement at the lack of mineralization in the area (Haskett, G.I., personal communication, Feburary 7, 1975). A great deal of evidence still exists pointing to the high degree of prospecting activity that once took place in the area of the Fryingpan-Arkansas Project Collection System. However, close examination of the old shafts, adits, prospect pits, and blast holes do not reveal why the prospector concentrated his efforts in anyone particular place, nor do the examinations reveal any present mineralization. To date, five collection system tunnels have been completed and one is presently under construction. These tunnels are geologi- cally mapped in detail (Scale: 1 inch = 10 feet), and so far there has been no report of base or precious metal occurrences despite a great deal of ~ock alteration (Davis, 1970 and 1974; Bartell, 1974). The only minerals reported include quartz, feldspar, and minor quantities of mica, pyrite, magnetite, fluorspar, and chloritized and clayey zones (Haskett, 1975). Beginning in 1964 with the onset of construction, the Bureau of Reclamation, in cooperation with the Bureau of Land Management, is conducting an exhaustive search of owners who have mineral rights in the Fryingpan-Arkansas Project Collection System. Once f~Ynd, the owners' rights wer~ Ouly those rights were obtained, --~r, which were directly affected by a structure, such as a tunnel. Generally, the right-of-way for a tunnel takes in an area 25 feet on all sides of the tunnel centerline for the entire tunnel length. This total area then is removed from any future mineral development. Surface rights-of-way are obtained for access roads. This does not preclude future exploration or exploitation of mineral deposits in the area. Developers may relocate the road at their expense and with the approval of the Secretary of the Interior, should it interfere with their operations. Assuming approval is granted by the appropriate Government agency, mineral development. can take place outside of the rights-of-way boundaries; this is based on the remote possibility that an III-22