$29\mathrm{.}2.$ Using the Bond method, estimate the power necessary per ton of rock in each of the operations in Prob. $29\mathrm{.}1.$

$29\mathrm{.}3.$ Solve Example $29\mathrm{.}2$ for a mill charge consisting entirely of $\frac{4}{6}-$mesh material. Plot the results and compare them with Fig. $29\mathrm{.}1.$