Laserfiche WebLink
found in overburden strata include calcite (CaCO3), limonite (Fe 203) and <br /> possibly siderite (FeCO3) . Small accumulations of copiapite (FeSO4) and <br /> halotrichite (Fe or MgSO4) may occur as crusts on the faces of coal <br /> seams and associated strata in abandoned open pits (Caruccio et al . , <br /> 1977). <br /> F. COAL SEAM ANALYSIS. Table 6-5, Coal Seam Analysis, summarizes the <br /> quality of the Upper Dakota , Lower Dakota and Nucla coal seams for <br /> overburden cores described in the overburden assessiiient section. Specific <br /> analysis for the mineral marcasite was not performed 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-008-81 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 Appendices 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 program 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 WDEQ (1985) . Phased <br /> 6-17 Revised 3/6/87 <br />