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Show MINERAL REQUIREMENTS The value added by the mineral industry is projected to increase from over $317 million in 1965 to about $895 million by the year 2020. Copper is expected to remain the dominant mineral in the Region, com- prising 60 to 65 percent of the total copper produced nationwide. The output of byproducts of copper, such as molybdenum, silver, and gold, is expected to parallel copper output. The production of sand and gravel and cement is expected to increase parallel to population growth and its subsequent needs for building and construction materials. MUNICIPAL AND INDUSTRIAL WATER A projected 370 percent increase in population, a sixteenfold increase in the value of manufacturing output, a fifteenfold increase in the economic activity in the trade and services sectors, and rising water-use rates by the Region's Indian and other rural residents are the major reasons for the tremendous growth of municipal and industrial water requirements shown on Figure 12, page 70. When compared to 1965 requirements, the 2020 annual depletions and withdrawals will increase by 0.9 million and 2.3 million acre-feet, respectively. The increase in livestock water requirement will be greater than 0.02 million acre-feet by 2020. The projected increase in range live- stock is slight. Feeder livestock, on the other hand, are projected to increase significantly over the study period. RECREATION The total demand for outdoor recreation is projected to increase from 138 million to 9l8 million recreation days between 1965 and 2020. The greatest recreation pressures are expected to be exerted on resources in the Gila Subregion because of the present and projected population concentrations there. About 70 percent of the total recrea- tion demand is urban oriented which means that this demand should be supplied within an hour travel time of the urban centers. Of the total projected! demand, about 27 percent is water-based (comprising activities requiring water, such as swimming, boating, fishing, water skiing, sailing, and canoeing). Figure ik illustrates graphically the projected recreation demand. 80 |