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When the inequality (nmin <_ n) is true, sampling is deemed adequate; and nmin is determined as <br />follows: <br />nmin = (t 25 2) / (0.1 X )2 <br />where: n = the number of actual samples collected (initial size = 30) <br />t = the value from the one - tailed t distribution for 90% confidence with n -1 <br />degrees of freedom; <br />52 = the variance of the estimate as calculated from the initial samples; <br />z = the mean of the estimate as calculated from the initial samples. <br />If the initial samples do not provide a suitable estimate of the mean (i.e., the inequality is false), <br />additional samples would be collected until the inequality (nmin <_ n) becomes true. <br />CEDAR CREEK ASSOCIATES, INC. Page 11 Bowie #1 Mine - 2013 <br />Phase II Bond Release Report <br />