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- 8 - <br /> <br />base metal mines in British Columbia and Yukon which often contain more <br />sulfide minerals than coal mine samples. The purpose was to assess the <br />accuracy and utility of the techniQUes to predict AMD formation and to <br />examine some aspects of the initial step in acid generation. The role of <br />particle size and presence of bacteria (Thiobacillus ferrooxidans) was also <br />studied in the humidity cell experiments. <br />Blending of potential acid producing rocks with acid consuming <br />rocks has been suggested as an effective material management technique to <br />prevent the formation of AMD (35). The effect of blending on a small scale <br />on AMD production was examined in two humidity cell experiments. <br />1 <br />