Laserfiche WebLink
West E[k Mine <br />• total replacement of the annual streamflow generated in the Dry Fork basin. For these reasons, <br />impacts to the Dry Fork of Minnesota Creek will be minimal due to B and/or E Seam mining. <br />2. Mining in the Box Canyon permit area will not measurably impact the surface water hydrologic <br />balance of the North Fork. As previously stated, 100 percent of the mining azea has a B Seam <br />overburden thickness of more than 500 feet, thus all but eliminating the possibility of surface <br />water capture by the mine workings. <br />3. Based on the B Seam mining plan, in the current pemut, which includes the Box Canyon permit <br />revision azea, it is not anticipated that there will be direct mining impacts to Sylvester Gulch. <br />In summary, based on the small amount of surface flow that occurs annually, the low probability <br />of surface cracking due to subsidence, and the depth of cover and the character of the overburden <br />materials within the permit area, the projected mine subsidence will not significantly impact the <br />streams. <br />Springs/Seeps <br />This section addresses PHCs for the springs and seeps in the current and South of Divide permit <br />revision area. <br />Frequency of Occurrence and Nature of Springs <br />• There are over 90 springs in the current permit area, as shown on Map 37. More than 90 <br />percent of these have at least 270 feet of overburden above the highest seam to be mined. Four <br />springs in the current permit azea exhibit significant flows: Spring G-26A (peak flow during spring <br />runoff up to 75 gpm) in Lone Pine Gulch; G-24 (up to 120 gpm) in Sylvester Gulch, and G-25 (up <br />C~ <br />2.05-164 Revised November 2004 PRl0 <br />