The deposits of the useful minerals & rocks; their origin, form, and content . Fig. 433.—Transverse (a) and longitudinal (b) section nortb-south and east-west resj)ectivelyof the iron deposit in the Chandler mine. Van Hise. readily, of converting the silica to soluble alkali silicate. In this manner,according to Van Hise and Leith, the enormous migration or removal ofsilica in the original deposit is explained. By these same solutionsiron was also frequently taken up in the ferrous condition, FeCO^or FeSi03, to be subsequently precipitated elsewhere as ferric oxide, at 1068 OEE-DEPOSITS oxidat
The deposits of the useful minerals & rocks; their origin, form, and content . Fig. 433.—Transverse (a) and longitudinal (b) section nortb-south and east-west resj)ectivelyof the iron deposit in the Chandler mine. Van Hise. readily, of converting the silica to soluble alkali silicate. In this manner,according to Van Hise and Leith, the enormous migration or removal ofsilica in the original deposit is explained. By these same solutionsiron was also frequently taken up in the ferrous condition, FeCO^or FeSi03, to be subsequently precipitated elsewhere as ferric oxide, at 1068 OEE-DEPOSITS oxidation by solutions containing oxygen. These secondary processes tookplace fairly near the surface, and accordinoly the deposits in general donot continue to great depth. This extensive migration of material took place in greater part in. Fia. 434.—Trausverse section tlirougli the iron deposit at the Colbj- mine in thePenokee-Gogehic district. Van Hise and Leith. pre-Cambrian time. Subsequently the district became covered in part byPalaeozoic formations, which later became disintegrated ; then followedja Cretaceous deposition which likewise surrendered to denudation; tillifinally came the Pleistocene glacial erosion. Migration of material resultingin the formation of ferruginous deposits took place also, though only onl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
