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State Req. <br />by the thickening and thinning of the coal in the SW9e SE9a Section 36, • <br />T6N, R87W. Overburden isopachs, Exhibit 6-I I, also show the <br />depositional and erosional nature of sandstones and shales and will be <br />discussed in detail in the overburden section of this chapter. <br />It should be noted that overburden and coal isopach and structure contour <br />maps extend beyond the Seneca II Mine plan permit boundary because <br />sufficient drill hole information is available to show the depth and extent <br />of strata in these areas. This information is used to further define the <br />thickness and extent of minable seams in the mine permit area. Mining <br />will not, in any of these areas, extend beyond the permit boundary with- <br />out prior approval of CMLR. <br />Other structural features in the direct vicinity of the Seneca Mine site <br />worth noting are a series of normal faults due north of the mine pro- <br />perty. There are at least three faults which have displacement up to 4 <br />feet and one major fault which strikes to the east and has a displacement . <br />on the south of approximately 40 to 60 feet. This fault may be found on <br />the regional structural map (Exhibit 6-12). These faults may have some <br />effect on the groundwater of mine site and will be discussed further in <br />the groundwater section (Tab 7) of this permit application. <br />OVERBURDEN ASSESSMENT <br />2.04.6(I)(b) Exploration and testing of the Seneca II Mine overburden were performed <br />to identify any acid-forming, toxic-forming, alkalinity producing, or <br />other inhibitory materials present within the proposed mine boundary. <br />These tests also reveal the most desirable overburden strata to be placed <br />at the spoil surface and in the pit base. This baseline information is <br />required prior to mining to effectively prepare a mine plan that restores <br />landscc~e productivity and which also minimizes environmental degrado- <br />t ion. <br />Contained within this report are evaluations of the chemical and physical <br />data, locations and extents of toxic overburden, and recommended ~`I <br />methods of mitigation. Spoil mixing phenomenon is "discussed and core <br />6-10 Revised 5/27/1981 <br />