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s <br />5.0 SPECIAL CATEGORIES OF MINING <br />• <br />5.1 Alluvial Valley Floor Determination <br />5.1.1 Introduction <br />A reconnaissance level study of the New Castle permit vicinity was <br />conducted to determine the extent and nature of possible alluvial <br />valley floors (AVF). The area of investigation included a two mile <br />radius around the "life of mine" boundary. Features were plotted <br />on a 1:24000 scale topographic base map (Figure 5.1-1). Low <br />altitude black and white and color infra-red aerial photos at an <br />approximate scale of 1:24000 were used to identify and evaluate <br />many of the features, most of which were field checked at a later <br />date. <br />• <br />Area drainages included in this study are the Colorado River, <br />Alkali Creek, and South Canyon Creek (Figure 5.1-1). <br />5.1.2 Description of Unconsolidated Sediments <br />Unconsolidated sediments, as represented by geomorphic features, <br />were first identified using aerial photographs and then field <br />checked. The study resulted in three geomorphic categories for <br />these sediments. <br />1) Alluvium: These deposits include all sediments asso- <br />ciated directly with the active portions of the various <br />stream channels and fans. Sediment size and thickness <br />varies considerably between streams and within any one <br />reach of a stream. These sediments are Quaternary in <br />age. <br />NCEC - Coal Ridge ~1 5-1 ABC/1145/900301 <br />