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FIGURE 3. DALTON PIT -- <br />Thalweg Changes Since 1977 <br />(Preliminary, Approximate) <br />6570 <br />~ 6560 <br />c <br />0 <br />a <br />w <br />6550 <br />6540 <br />--"--- 4- ~ <br />Trimble ~ ~ <br />Bridge ~~ <br /> _. <br /> /. <br />/ ~.. ..r <br /> <br /> ~~ <br />' <br />' <br />..~ ~ <br />..• <br />....~.....ei- ~ SC-1 <br />~ ....... <br /> <br />.~ <br />.-r ~- <br /> <br /> <br />~ ~ m <br />. <br />- - o ~ <br />- <br />' <br /> ~~ <br />,.. <br />` <br />77.0 77.2 77.4 77.6 <br />--+- 1977 (USAGE flood study) <br />-~~----•~- 1990 (Goff, 1992a) <br />a........ 11-12/93 (Sandco) <br />- -+ - 12/96 pre-mining (Sandco) <br />---r-- 12/97 pre-mining (Sandco) <br />~- 11/02 pre-mining (Sandco) <br />1977 River Mile <br />77.8 78.0 78.2 <br />Note: Horizontal placement of Dalton cross sections is based <br />on data provided by Sandco and may be more accurate than for <br />Bar-D and Hermosa Meadows Pits; thus, apparent gradients <br />between cross sections and apparent elevation changes with <br />respect to earlier data may be more accurate than in Figures 1 <br />and 4. Vertical placement of Dalton cross sections is accurate, <br />so recent thalweg elevation changes are shown accurately. <br /> <br />Giilam to Hellige 11/28/03 <br />