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<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
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