. A complete geography. nd those cities which burn great quant t7eof It are very sooty in consequence. q>ianrities Iron Ore. -Formerly Pennsylvania was the chief iron-producing northwest of Lake Michi-gan, and near the westernend of Lake Superior, havediscovered what seem to beinexhaustible beds of ironore. In some places theore is so soft that, likeclay, it can be dug out bysteam shovels, and so nearthe surface that the mines are open pita (Fig. 132). That is the , for example, at Ishpem-ING, 111 northern Michigan. Tliis Lake Superior district is now the leading iron-producino-centre m
. A complete geography. nd those cities which burn great quant t7eof It are very sooty in consequence. q>ianrities Iron Ore. -Formerly Pennsylvania was the chief iron-producing northwest of Lake Michi-gan, and near the westernend of Lake Superior, havediscovered what seem to beinexhaustible beds of ironore. In some places theore is so soft that, likeclay, it can be dug out bysteam shovels, and so nearthe surface that the mines are open pita (Fig. 132). That is the , for example, at Ishpem-ING, 111 northern Michigan. Tliis Lake Superior district is now the leading iron-producino-centre m the world. The main diffienlty, however is the act «!there ,s no coal in that region. Consequently, In o der tha tl e emay be reduced to the metal, either coal must be transported thUheor the ore must be carried to the coal regions. The latter pro esshas proved the cheaper. «i piooess Fortunately the ore deposits are located near « Tf ?^-necessa:y to carry the iron ore a long distanceby rir^eTxpe^elnlg^h:. Fig. open iron mine in the Lake Superior district. 134 NORTH AMEBIC A be so great as seriously to check its production. As it is, however, the oreis mined, loaded upon cars, and sent over short lines of railway to the lakeshore. Great ore docks. (Fig. 133), or piers, reaching far out into deepwater, have been constructed to hold the ore. Railway tracks are built
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeograp, bookyear1902
