Some Engineering Problems Of The Panama Canal In Their Relation To Geology And Topography

COST OF CONSTRUCTION. 77 crushing per cubic yard of product is much less at the Ancon than at the Porto Bello quarry. This difference is due to the fact, as already explained, that the Ancon rock is cut by many joint planes, which cause it to fall apart into relatively small fragments on blasting. The Porto Bello rock, on the other hand, has few joints, and therefore blasts out with many great coarse fragments, which, have to be broken by adobe blasting, thus increasing the blasting cost as well as the loading and crushing charges. Of course the rela- tively long water haul and the reloading on cars, for transportation to the place of storage and use, adds much to the final cost of the Porto Bello rock. Cost of stone production from the Ancon and Porto Bello quarries, fiscal years 1911 and Item. Atlantic Division, Porto Bello quarry. Pacific Division, Ancon quarry. 1912 1911 1912 1911 Crushed stone produced, cubic yards Quarrying: Stripping 440,412 864,03J 839,279 855,824 30.0040 .0431 . 1622 .0774 .0669 .0340 .0353 .0621 . 4897 $0.0174 .0450 .1980 .0921 .0758 .0464 .0289 .0981 .3350 SO. 0423 .0552 .0465 .0356 .0576 .0379 SO. 0476 .0449 .0421 .0452 .0727 .0243 Drilling Blasting Loading Transportation Tracks Power Maintenance of equipment Plant, arbitrary Total .0568 .1903 .0333 .2447 .9747 .9367 .5222 .5548 Crushing: Operation of crushers Stone bins and conveyors Power .0283 .0168 .0462 . 0827 .2524 .0355 .0311 .0394 .1158 .1726 .0179 .0045 .0187 .0311 .0592 .0172 .0045 .0183 .0175 .0762 Maintenance of equipment Plant, arbitrary Total .4264 .0269 .3944 .0551 .1314 .0184 .1337 .0228 Total division expense Total cost of production Towing: Operation of tugs and barges Maintenance of equipment Plant, arbitrary Total 1.4280 1.3862 .6720 — .7113 .1557 .1267 .1794 . 1592 .1063 .1975 .4618 .4630 Unloading: Operation of cableways and cranes .0987 .0608 .0224 .3441 .1168 .0195 .0929 .2050 — Power Maintenance of equipment Plant, arbitrary Total » .6260 J .4342 Rail transportation to storage: Cubic yards transported Operation of trains Repairs to tracks Dumping in storage 139,167 275,148 839,279 855,824 80.1297 .0194 $0.0819 .0142 .0155 .0672 SO. 0366 .0004 .0110 .0206 .0590 $0.0447 .0075 .0098 .0157 .0553 Maintenance of equipment. ........ Plant, arbitrary .1022 Total . Total cost of storage .2513 2.4952 .1788 2.3403 J . 1276 .7996 .1330 .8443