Des transactions . La limonite se produit à base de pierre calcaire de la falaise située quasiment à l'horizontale de 30 à fortyfeet élevé, recouverte par un dépôt argileux à grain fin et de limon. Itscontinuation vers l'intérieur est caché par ce overlyingrocks, et son apparence au pied de la falaise est souvent obscuredby les talus, en résultant. Tous les sus-jacente theore calcaire contient de carbonate de fer, la partie inférieure, ou que dans closeproximity au minerai ferrugineux décidément, étant souvent. Themass de minerai a est due en partie à l'oxydation directe d'thesiderite dans ce calcaire contenant du fer, et

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Transactions . The limonite occurs at the baseof cliffs of limestone lying almost horizontally from thirty to fortyfeet high, overlaid by fine-grained boulder clay and silt. Itscontinuation towards the interior is hidden by these overlyingrocks, and its appearance at the foot of the cliff is often obscuredby talus, resulting therefrom. All the limestone overlying theore contains iron carbonate, the lower part, or that in closeproximity to the ore, being often decidedly ferruginous. Themass of ore has resulted in part from the direct oxidation of thesiderite in this iron-bearing limestone, and in part by the replace-ment of calcareous and other impurities contained within thelimestone, either by hydrous iron-oxide deposited as sideriteand subsequently oxidized, or directly as hydrous iron-oxide incavities. This ferruginous material is brought in solution ascarbonate by waters containing carbon-dioxide and is doubtlessleached from the wide areas of siderite-bearing limestone above theore strata. >. Fi(.. 1llut<-«l. |M.t-lir»lc-likc Ilihr^Miiiciit of a joint, plane in limcstoiic, sliowinj^ how ravitics were made Iron Ores of the Mattagami River—Baker 305 From the paragraph just quoted it is evident that Mr. Bellconsiders that the iron ores were formed from the leaching of theDevonian limestone, or a part of it. The writer does not, however, believe that this is the correct solution of the problem; but, onthe contrary, considers the limonite and the hematite to haveoriginated from the oxidation of Animikie side rite, which occursin place at the head of the rapids, and to which reference hasalready been made in a preceding discussion of the geology ofthe district. It is also the writers belief that this Animikiesidcrit^ exists at many places about the margin of the Palaeozoiccoastal plain. In the reports on the various rivers of this area, one is impres.sed with the regularity with which iron-holdingdeposits occur about the edge of the basin, and it would appeart

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• bookcentury1800
• booksubjectmineralindustries
• bookyear1895
• librury