Laserfiche WebLink
• found in overburden strata include calcite <br />possibly siderite (FeC03). Small accumula <br />halotrichite (Fe or MgSOG) inay occur as <br />seams and associated strata in abandoned <br />1977). <br />(CaC03), limonite {Fe203) and <br />tions of copiapite (FeSOA) and <br />crusts on the facts of coal <br />open pits (Caruccio et al., <br />F. COAL SEAM ANALYSIS. Table 6-5, Coal Searn Analysis, summarizes the <br />quality of the Upper Dakota, Leaver Dakota and Nucla coal seams for <br />overburden cores described in the overburden assessment section. Specific <br />analysis for the mineral marcasite was not perforrtred on any of the samples <br />listed in Table 6-5. However, marcasite content will be included as part <br />of the total pyritic content, and is therefore necessary. <br />G. OVERBURDEN ASSESSMENT. The scraper pits at Nucla Mine, outlined as <br />Areas 2 and 3 on Exhibit 12-1, Operations Plan, are proposed to be mined <br />in 1987 and 1988. Both of these areas are located adjacent to <br />previously mined areas. Overburden, interburden and underburden (OIU) <br />• sampling for Nucla Mine Permit C-008-81 occurred within 300 feet of .Mine <br />Areas 2 and 3 (Hole 2C). Seven drill hole locations were sampled for <br />Nucla Mine Permit C-008-31 to meet the OIU baseline permitting <br />requirements (see Exhibit 6-3A, Overburden Sample Locations, for <br />location of holes). <br />The 1977, 1979 and 1980 OIU sampling program consisted of drilling seven <br />2-1/8 inch core holes, No.s 1C, 2C, 3C, 4C, 695E, 697E and 775E, at <br />various locations to be disturbed by mining (see Table 6-2, Exhibits <br />6-3A and 7-2 and Appendix 6-4). Each core was described and shipped to <br />Peabody Coal Company Central Laboratory in Freeburg, Illinois for <br />analysis. The lithologic logs, core description procedures, analytical <br />procedures and analytical data are contained in Appendic::s 6-1 through <br />6-4, respectively. Interpretation and discussion of the data is <br />presented later in Tab 6 within the Parameter Selection section. <br />Peabody Coal Company utilized a two phase OIU sampling prugrain for Mine <br />• Areas 2 and 3. Similar phased sampling techniques have been described <br />by USDA (1979), Barrett et al. (1980), Dollhopf et al. (1981), Barth et <br />al. (1981), MDSL (1983), Dollhopf (1983), and 'ADEQ (1985). Phased <br />6-17 Revised 3/6/37 <br />