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<br />Section 779.14(x) Continued. Rule 2.04.6 <br />sulfate gives the amount of potential acid-producing sulfur in the sample. <br />To determine the neutralizing bases present, the sample was treated with <br />an excess of standard HC1 and boiled to expel all COZ produced. The <br />resulting solution was then titrated with standard base to pH 7 and the <br />neutralization potential calculated. The values for acid-producing sulfur <br />and neutralizing bases were then compared to establish the capability for <br />the sample to neutralize any acid produced. <br />Acid-base potential is reported in tons of CaCO, equivalent per thousand <br />tons of material. This method is consistent with the requirements for <br />calculation of acid-base potential as required by the 1977 Wyoming DEQ <br />Guidelines for overburden. The difference between total sulfur and <br />sulfate sulfur gives all reduced forms of sulfur remaining in the <br />material. The reduced sulfur forms include iron sulfides, pyrite, and <br />maracasite, with pyrite commonly occurring as the dominant component. <br />• <br />In the original permit application, a total of bl overburden samples were <br />collected and analyzed from the 18 dril]holes listed in Table 5a, List of <br />Drillholes Sampled for Overburden Analysis. These hoes are shown on the <br />Kerr Mine Area Geology Map (Map 6a). These boles yielded 54 individual <br />samples which were analyzed for the 31 parameters listed in Table 3, <br />Overburden Analysis List. Thirteen additional samples from two (2) of the <br />drillholes were analyzed in 1977 for the 11 parameters set forth in 30CFR <br />211.10(c)(b)(xii). The results of all overburden analyses from the <br />original Kerr permit submittal (1980) are presented as Exhibit 24, <br />Chemical Analysis of Overburden. This analysis summary included a total <br />of 1,817 individual chemical values. <br />Drillholes located in areas to the south of and including the Pit 1 area <br />have been mined out and these holes appear to have been drilled with mud. <br />Due to the significant potential for sampling bias resulting from sample <br />• contamination by drilling mud, these holes have been deleted from the <br />present evaluation of strata to be affected by future mining activities. <br />779-17 a <br />Revised - Apri1,1990 <br />