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•! <br />Sec*. ion 815.50 (a) Continued. <br />mine drainage, to minimize adverse effects of mining on ground water <br />systems outside the permit area, and to support approved postmining land <br />uses. <br />No acid- or toxic-forming or otherwise harmful materials exist <br />within the overburden to be handled during mining. This is dis- <br />cussed in detail under Section 779.14 and is documented with data <br />presented in Table 108, Results of Analysis on Overburden Samples. <br />The method of backfilling will be progressive .replacement of over- <br />burden material into previously mined-out areas with draglines. <br />Rough grading will be done with track-type bulldozers. A detailed <br />discussion on backfilling is presented under Sections 780.11 and <br />816.100-816.106. This is a non-selective method of placing back- <br />filled materials with respect to material type or placement lo- <br />cation. However, since no acid- or toxic-forming materials exist <br />in the overburden in the mine plan area, this method will never- <br />theless serve to assure protection of ground water quality within <br />or outside the permit area. The proposed postmining land use of <br />primarily non-irrigated rangeland (see discussion under Section <br />780.23) will be unaffected by non-selective backfilling with spoil <br />material. <br />(b) To control the effects of mine drainage, pits, cuts and other mine <br />excavation or disturbances shall be located, designed, constructed and <br />utilized in such manner as to prevent or control discharge of acid, <br />toxic, or otherwise harmful mine drainage waters into ground water <br />systems and to prevent adverse impacts on such ground water systems or <br />on approved postmining land uses. <br />The location, design and plan for mining presented in Sections <br />780.11 and 780.14 have been evaluated for impacts on ground <br />• 816-56 <br />