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The subsidence study was initiated during the last • ~pnths of 1982. (Phase 1) when most data were collected, sorted and evaluated. During the early part of 1983, the subsidence study was expanded; the results of the expansion (Phase II) are presented in this final report. 1.2 SCOPE OF THE STUDY 'Phe scope of the subsidence study was uefined in two proposals submitted to CWI on September 8, 1982 (Phase I) and January 20, 1983 (Phase II). As no report was prepared at the conclusion of Phase I, the results of both phases will be discussed in this report. Tlie scope of the proposed work is to define individual natural resources, man-made structures and facilities that are present within the proposed lease area or within the expected subsidence zone and to evaluate the potential effects on them. Individual resources and structures are to be inventoried and evaluated within Please I of the study and the subsidence effects on them are to be specified within Phase II of the study. Ttie inventory of resources and structures was prepared mostly by CIvI engineering staff or by their consultants. The resources and structures have been divided into • several groups: Land Use: The land use of the proposed lease area and its immediate vicinity is to be evaluated, and after the assessment of probable subsidence effects, any changes in land use should be predicted. Such an evaluation will provide necessary data on how the post-mining land use would be influenced. Landslides: The area of the proposed ease is known to contain numerous landslides and potentially unstable areas. These were identified by Junye (1978). GEO-HYllRO was involved in the evaluation of several landslides that might exist above ties existing CWI least. The subsidence study should predict tiow future mining and the related surface subsidence will affect the stabile*_y of the old landslides and whether new landslides could be caused by mining. • _ ~ _