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<br />I~ . <br />- 2 8 - <br />that particle size was not a major factor influencing the rate of acid <br />production until the mean particle diameter was reduced to less than about <br />12.7 mm. Below that value the rate of acid production increased <br />exponentially (14). <br />The results of our humidity cell experiments suggest an exponen- <br />tial relationship between acidity production and particle diameter, but a <br />linear relationship with total exposed surface area. in general, acidity <br />production increased dramatically at mean particle size less than about <br />10 mm, in agreement with the soxhlet study discussed above. <br />3.2.3 Blendin Both sample D1 (net NP -3 tonnes <br />CaC03/1000 tonnes) and 02 (net NP +51 tonnes CaC03l1000 tonnes) produced <br />alkaline leachates in the humidity cell experiments with rising pH's during <br />the 10 week experiments. Using the criteria applied to other humidity cell <br />results, these blended samples would not be expected to produce acid mine <br />drainage. <br />The sulfate production rate was calculated from the proportion of <br />'the two rock samples used in the blend and the sulfate production gate <br />obtained from the humidity cell tests of the components. The calculated <br />sulfate production rate for blended samples O1 and D2 were 12.9 and S.0 mg <br />SOq/week compared to actual results of 11.0 and 8.3 mg SOq/week respective- <br />ly obtained from the humidity cell test of the blended sample. As such, <br />the calculated results are in good agreement with the actual values. <br /> <br />r <br /> <br /> <br />