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<br />~~ <br />l <br />- 31 - <br />the simpler, less costly, acid/base accounting method may be suffi- <br />cient. However, where the effect of various mineralogies, particle <br />sizes, or confirmation of potential is important, the humidity cell <br />test and other kinetic methods should be considered. Kinetic tests are <br />also useful in identifying heavy metals that may be released in acid <br />mine drainage and in studying the initial step of acid mine drainage <br />formation. <br />91 Additional studies of the initial acid mine drainage formation process <br />are required to better define the capabilities and limitations of <br />predictive techniques. <br /> <br /> <br /> <br />r <br />r <br />r <br /> <br /> <br />