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"Low altitude black and white photographs and high <br />altitude color infra-red aerial photographs were first <br />~• enhanced and interpreted in an effort to identify <br />faults, joint concentrations, or other structures which <br />might significantly effect mining operations. The low <br />altitude black and white photographs were supplied by <br />Cyprus Coal Company and the high altitude coverage was <br />purchased from the U.S. Geological Survey EROS Data <br />Center. <br />"Features identified by the photography were statistically <br />evaluated to define major trends and concentrations of <br />joints, fractures, or other linear features. These <br />were field checked and re-evaluated with regard to its <br />structural significance and potential impact on the <br />mining operations. <br />"Regional Structure was first interpretated stereographically <br />from enlarged 1:40,000 scale high altitude aerial <br />photographs. Linear features were identified as possible <br />signs of weakness or discontinuity. The low altitude <br />black and white aerial photos were then interpreted <br />stereographically in an effort to locate physical <br />joints, fractures, and offsets in lithologic units and <br />other linear features which might be structurally <br />significant. Stream valleys and escarpments commonly <br />• coincide with structurally weak zones which are more <br />easily eroded than undisturbed rock; many linear gulleys <br />and stream valleys were included in the photointerpretation <br />as possible fracture zones. <br />