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=~ --......__--_y.._-~~ . _= _.._~ <br />r_. <br />boundary 1Ie on the steel flanks of the Wet Mamtalns and form steel, <br />V-shaped valleys cut Into blottte gneiss, collwlal and pediment <br />deposits. Two (2) of the upper three (3) contributing strew have <br />eroded valleys through the pediment deposits Into the underlying <br />bedrock. The third stream flaws on pediment deposits to within 500 feet <br />of its confluence with the saoond-order trunk stream. Belau this <br />confluence In the easttentrai portion of the permit area, the strewn <br />flows to Newlin Creek In a deep valley cut Into bedrock. The laver two <br />(2) contributing streams form similar valleys. They flow on pediment <br />deposits for short distances In their upper reaches. Generally the <br />upper stream vaileys (In Section 36, T205, R70W and Section 31, T205, <br />R69W) average less than 300 feet In width at the top, a few feet wide at <br />the bottom, and 30 to 50 feet deep. In the southern portions of the <br />permit area the vaileys are 300 to 500 feet wide at the top and a <br />• maximum of a few Lens of feet wide at the bottom, and up to 60 feet In <br />depth. The stream bed occupies the entire valley floor over nearly all <br />of the length of the valleys In the 558. The stream valleys beiaw the <br />old Vento Mine edit in the NW 1/4 of Section 30, T205, R69W range fran <br />500 to 1,400 feet wide at the top and up to 120 feet In depth. Here <br />also the stream bed occupies nearly all of the narrow valiey floors. <br />The nearly flat, rortheast-sloping mesas form the highlands between the <br />valleys, and are capped by irregular rertrants of the old, dissected <br />pediment surface. <br />Past surface operations associated with undergrotnd coal mines have <br />taken place In the valley of the second-order stream in at least four <br />(4) places, and In at least three (3) places in the valley of the fifth <br />contributing stream and In at least one place in the fourth contributing <br />stream valley (see Hydrology Map, Sheet 4), 5 1/2 Section 19, and N 1/2 <br />Section 30. Amine dump exists on a tow divide between the fourth and <br />fifth oontrtbuting streams in the extreme north~entral part of Section <br />• 30, T20S, R69W. The portal and surtace faeliities of the Dorchester <br />No.l Mine are located 1n the valley of the second-order trunk stream at <br />the confluence with the fourth contributing stream, In the NE 1/4 NW 1/4 <br />` Section 30. The trunk stream has been diverted through the divide above <br />the mine dump area where it is delivered to the fifth contributing <br />