The Employment of Qualified, Important Men 25 a#39;06 05 08. JOPLIN ... 1; total mining cost, 65.l5 cts. per ton. Milling ... The cost of mining and milling. including everything except depreciation, was 98 cts. per ton. ... 49.l5 cts.; explosives, 20.49; fuse. ... A box that holds about 800 pounds of ore is placed on a Fairbanks scale and its contents weighed accurately and then dumped into the Challenge feeder.