2001-12-11_PERMIT FILE - C1980005 (4)

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