1. Calculate the surface per unit volume in square centi- meters per cubic centimeter of galena having the screen analysis below. Use the method of extrapolation for -200 mesh, and assume that the two points between 100 and 200 mesh determine the straight line in a log-log plot. Specific gravity of galena = 7.43. Mesh 3 + 4 4 + G 6+8 8 + 10 10+14 14 + 20 20 + 28 28 + 35 35 + 48 48 + 65 65 +100 -100 +150 -150 +200 -200 - 1 - - - - - Percentage Retained 1.0 4.0 8.1 11.5 16.0 14.8 13.2 8.1 6.2 4.1 3.6 2.2 1.9 5.3

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