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<br /> " 0 <br /> , <br /> 0 <br /> !". ~ <br /> <:,Q <br /> " . <br /> I ~ <br /> I <br /> I <br /> ,I <br /> I'; <br /> I, <br /> I <br /> ;, <br /> : ~I <br /> ;:ri <br /> .)'1 <br />, I, <br />ii <br /> "I <br /> " <br /> j',,: <br /> ."I'li <br /> 1>1 <br /> " <br />',II; <br /> 1'1. <br />'1'1. <br />,I: <br /> '1 <br />I,,:' <br /> III <br /> ',II' <br /> 'I <br />"., <br />:1' <br />':1 <br /> ,', <br /> '0' <br /> '" <br /> Ji' <br />: , .!. ~ <br /> '" <br /> ,I <br /> Ii <br />I,: <br />" <br />" <br />, I <br />, <br />," <br />il'll <br />,I,' <br />III <br /> " <br />Ii <br />, <br />" <br />iii <br /> <br />I.: <br />'~-- <br /> <br />12. Field surveys of mineral resources and mineral industries <br />are an integral part of the long-range plan of minerals investiga- <br />tions. The surveys conducted to date have served to enlarge greatly <br />the inventory of mineral resources in the areas' examined, to locate <br />and procure data on many new mineral-producing operations, to correct <br />iDaccuracies in recorded locations of some mineral deposits, and to <br />reveal the existence of potentially valuable deposits. It is pro- <br />posed that these surveys be continued vith the additional ultimate <br />objectives of: development of uses ,for potential products of un- <br />worked mineral deposits; development of local resources to supply <br />industries which obtain mineral raw materials from remote sources; <br />and develop~nt of markets for mineral by-products. For more effec- <br />tive results, the cooperation of agencies engaged in economic studies <br />, . , <br />and the development of other resources will be solicited. <br /> <br /> <br />13. KnOwledge of the character, distribution, and structure of <br />the near-surface rocks of the earth's crust is essential to the eco-' <br />nomic development of the AWR Basins, for these features of the rocks <br />control the surface characteristics of the land and the sub-surface <br />distribution of ground water, oil, gas, coal, metallic and nonmetal- <br />lic minerals. The physical makeup of the earth's crust is shown by <br />geologic maps. These maps and the reports that accompany them are <br />graphic and verbal interpretations of the structure of this crust and <br />the interrelationship of the rocks that compose it. <br /> <br />l4~ ' Geologic maps, mostly at scales of l:62,500 to 1:l25,OOO, <br />are available or are being prepared for only a little more than 40 <br />percent of the area of the Basins. Many of the existing maps are <br />very detailed, particularly those that cover certain mining districts <br />and oil fields; but about half of them are old and fall short of mod- <br />ern standards, are too small in scale, or are otherwise inadequate. <br />The need for ,a coordinated and accelerated program of geologic map- <br />ping in the AWR BaSins, directed toward meeting the particular needs <br />for development of the Basins and coordinated with broader national <br />requirements, is thus apparent. <br /> <br />l5. The geologic mapping plan proposed in this section is de- <br />signed for execution within a 20-year period, The guiding principles <br />upon which the plan is based include (a) the program should meet the <br />needs of the area, but must be considered also in the light of na- <br />tional needs and welfare; (b) the long-range objective of complete <br />geologic coverage must be resolved into lesser and more specific, <br />logical, and orderly short-range programs; (c) general geologic map- <br />ping should provide maximum benefits for future use without unnec- <br />essary expense; and (d) mapping of specific areas should be on a <br />scale commensurate with present and foreseeable future development <br />and the character of the geology as it is now known. <br /> <br />l6. The necessity for cooperation between the various agencies <br />and work groups planning resource developments in the AWR Basins, and <br />for ultimate integration of the various plans was recognized early by <br />AWRBIAC. Anticipating that some proposed reservoir sites might <br /> <br />4 <br />