E/MJ : engineering and mining journal . bove thefault. In some cases this has resulted in bringing rela-tively impervious parts of the iron formation or of thequartzite below the fault underneath the relatively per-vious and rich portions of the formation above the condition has served to control the water circula-tion much as though a dike were present. It is believedthat some of the orebodies in the Mikado and Asteroidmines are due to situations of this kind. chert beds, the relatively impervious nature of the thin-liedded ferruginous slates acting to retard the alterationprocess.
E/MJ : engineering and mining journal . bove thefault. In some cases this has resulted in bringing rela-tively impervious parts of the iron formation or of thequartzite below the fault underneath the relatively per-vious and rich portions of the formation above the condition has served to control the water circula-tion much as though a dike were present. It is believedthat some of the orebodies in the Mikado and Asteroidmines are due to situations of this kind. chert beds, the relatively impervious nature of the thin-liedded ferruginous slates acting to retard the alterationprocess. The cherty members of the iron formation seem ingeneral to be more porous than the ferruginous these more cherty portions the massive parts wherethe chert beds are much thicker are in general lessporous than the beds in which the bedding planes arecloser together. In some places orebodies rest upon afoot wall of massive, dense, lean, ferruginous chert,which has proven to be sufficiently impervious to the raullTont BjKn SJate. KUJ. IG. SKETCH OF WEST SIDE OP A CROSS CUT ON THEH LEVEL OF THE PURITAN MINE Shows the irregular top of an orebody and the way tlie form isinfluenced by thickness of beds. Where beds are thinnest theformation is altered to ore higher than where they are thicker.
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
