Laserfiche WebLink
material will swell approximately 20% using the same comparison. In the 170 ft. mining <br />• zone 48.6% of the material has SDIs greater than 65 and a strata thickness greater than 4 feet. <br />The material is sandstone and siltstone. The remaining 51.4% of the strata has SDI's less <br />than 30 and represents soft shales. Using this information a weighted average swell of <br />29.72% was calculated. This was rounded to 30% for use in the spoil balance calculations. <br />This information has been included in Exhibit 6 on revised pages 10, lOb and lOc. <br />35. [s the location and elevation for the DH series of drill holes the only information available? <br />es se <br />A limited amount of information is available from the John T. Boyd Report. Only sporadic <br />data for the DH Series of drill holes is available. Due to the incomplete nature of these files, <br />this information was not included. <br />36. The Division current understanding of the coal seams to be mined by the surface mine aze, <br />in descending order, R, Q, P, O, O,, and the N. Underground mining will occur in the R and <br />the Primero, the lowest seam to be mined. All seams to be mined should be depicted on <br />Figure G-1, Representative Columnaz Section and list ranges of thickness which agree with <br />the coresponding text. Page 10 of Exhibit 6 states "coal to be mined at the surface mine <br />consists potentially of the P, O, N, and Q seams." No mention is made of the R and the O, <br />and furthermore, the seams aze listed out of sequence. Please correct this information <br />throughout the permit to be accurate and consistent. <br />• Response <br />All seams to be mined have been included on Figure G-1 with the coresponding range of <br />thicknesses. The R, Q, P, O and O] seams will be mined at the surface mine. This has been <br />corrected on revised Exhibit 6. <br />37. Cross sections and the geology map indicate the R seam and the Primero seam aze sepazated <br />by 450-500 feet. However, Figure G-i indicates neazly 700 feet of separation. Which is <br />cored? Inaccurate information should be removed or corected. <br />Both statements aze cored. The interburden sandstone thins to the northeast across the <br />property as seen on the cross sections. The R seam and Primero seam aze sepazated by some <br />700 feet in the southern portion of the site as depicted on Figure G-1. The seams aze <br />sepazated by 450-500 feet in the northern portion of the permit azea. <br />38. The Geology Map 2.04.6-2 provides information for the R and P seam for the surface mine <br />and the C and P seam for the underground operation. Are the R and the C seam the same <br />seam while the P and P seam aze different? Other information references the Ciruela seams, <br /> <br />11 <br />