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002888 result in reduced labor requirements. However, projections of overall econom- ic actIvity can be taken as being on the hIgh side. Primary Sectors Coal mining and conversion alternatives are assumed as part of the pos- sible energy-development proposals, with the agriculture scaled according to the resource availability after mining, conversion, and secondary sectors are taken into consideration. In the basin,assessment, interactions between in- creased coal-resource and agricultural developments must be weighed against preserving the physical features of the basin for a variety of recreatIonal uses which contribute significantly to the regional economy, Physical and economIc resource information will be adapted from State reports, other fore- casts, or the University of Colorado's input-output model (Udis and others, 1973) . It is assumed that indivIdual plants and the coal-transportion facilIties wil I already exist at the projected 1990 levels in order to minimize new con- struction activity and secondary development from this construction activIty. That is, we are assuming that the physical facilities and employment bases will have developed sufficiently by 1990 to support the assumed level of min- ing-conversion activity so that by then new construction activity for coal- development related facilities will be minimal. In summary, by working backwards from a specified final demand for coal and conversion activities, the agricultural activities are calculated. From an input-output type of analysis, assuming a fixed set of mines and plants with a fixed set of technologies, primary sector employment and other input demands are calculated. From the employment and other demographic and insti- tutIonal information, the total population forecasts can be made, along with demand for secondary sectors. The level of secondary sector activity will be based on the current proportions or ratios impl ied by the most recent version of the input-output model adapted for the Yampa River basin. Secondary Sectors Secondary economic sectors broadly include services, local government, transportation, retail commerce, and finance. Depending upon the level of de- tail required and available, the retail commerce and financial sectors can be combined, Services, local government, and transportation s~ctors also can be combined. The general mix between the various secondary sectors then may be assumed to be the same as either the present mix for the Yampa River basin or, more logically, the observed mix in a "typical" energy-development region. The level of activity in the supportive industries will be determined by the income and employment generated by the primary sectors. In order to simplIfy the analysis, it will be assumed that no primary or secondary manufacturing industries are generated by the mining and energy de- velopment in the particular regIon of the Yampa River basin. Although this may be underestimating the potential for development, the generated envIron- mental impacts will represent conservative estimates, 13 ~