Laserfiche WebLink
<br />• <br />f~ <br />gneiss, flows across a mapped landslide .(Scott and Taylor, U.5.6.5., <br />1974), then flaws on pediment gravels across the permit area and <br />downstream for 1 1/4 miles, then flaws In a valley carved Into bedrock. <br />The second Is Second Aikalt Creek which begins at the northern boundary <br />of the rorthwest portion of the penult area and flaws on pediment <br />deposits for a mile downstream, and then into a valley carved In the <br />underlying bedrock. <br />The remaining streams of the area are tributary to Newlin Creek. <br />The wrface drainage of the permit and wrrounding areas can be divided <br />Into three (3) distinct sub-basins to discus their geomorphic <br />characteristics and relation to the mining operations. These are: the <br />North Sub-basin (NSB); the South Sub-Basin (SSB), which consists of the <br />• entire Magpie Creek drainage Including the Lower Magpie Sub-basin which <br />has been Isolated by the Magpie Creek permanent diversion; and the <br />remainder of the Newlin Creek drainage basin above the confluence with <br />the sub-basins North and South (SW 1/4 SW 1/4 SEction 17, T20S, R69W, <br />6th Principal Meridian). <br />North Sub-Basin (NSB) <br />The North Sub-Basin (NSB) is comprised of six (6) mapped, <br />Intermittent streams (here designated first-order), which Joint Lo form <br />a second~rder stream that flows into Newlin Creek about a mile <br />downstream fran the northeast corner of the permit area. The sub-basin <br />lies northwest of Newlin Creek, trends northeast and Is very elongated, <br />being Duty 3,500 feet at its w(dest point, but is nearly 23,500 feet <br />long. The basin coveres 2.33 square miles (see Hydrology Map, Sheet 1). <br />The longest stream course measures approximately 24,400 feet or <br />4.62 miles with an average gradient of 671 feet per mite (elevation 8956 <br />to elevation 5855). The three C3) uppermost streams range from 0.87 <br />mile to 1.33 miles in length with gradient rates ranging fran 2205 feet <br />~ per mile to 1120 feet per mile respectively. The laver three <br />contributing streams range from 0.34 mile to 1.02 miles in length with <br />average gradient rates ranging from 337 feet per mile to 460 feet per <br />