. Transactions. have presented a resisting front to the movement, but whichprobably antedate some though not all of it. The alteration of thediorite is excessive and it has apparently been subject to some influence,especially in the vicinity of the ore which has almost obliterated the horn-blende and feldspar in favor of chloritic greenstone. In this crushedzone, traversing Lola Hill like a backbone, the great slab-like masses ofore are distributed along a northwest and southeast line. Dr. Spencer sketched several cross-sections of the orebodies when atthe mines in 1901, which are reproduced i
. Transactions. have presented a resisting front to the movement, but whichprobably antedate some though not all of it. The alteration of thediorite is excessive and it has apparently been subject to some influence,especially in the vicinity of the ore which has almost obliterated the horn-blende and feldspar in favor of chloritic greenstone. In this crushedzone, traversing Lola Hill like a backbone, the great slab-like masses ofore are distributed along a northwest and southeast line. Dr. Spencer sketched several cross-sections of the orebodies when atthe mines in 1901, which are reproduced in Figs. 3 to 6, along with onefrom Firmeza. To those in Figs. 3 to 6, is added one more. Fig. 30,reproduced from panoramic photographs of Lola Hill made by the photog- JAMES F. KEMP 27 ^^ipm ?I^HH^MaaHnnM^^^ MK-Ji w^ -* l-ft^ ??*^^^- # ^?yt -««M Jjj^a^ Pjt •^s^H i^*^/^- ^ 7 - M 5 -^ • . 1. ^ :>4aL 1 U/ v^\*«^;^H ^ JLJ^ -.^mI ^ liK^fji^.- -1<I. ^y iy^,-- 28 THE GEOLOGY OF IRON-ORE DEPOSITS. s « JAMES F. KEMP 29 rapher of the Spanish-American company, Francisco Crego. Thesketches only afford cross-sections, but we can justifiably imagine thatthey continue for relatively long distances at right angles to these cross-sections. They are much deeper than wide and in the aggregate, so faras mining has shown, they are on Lola Hill longer than deep. The orehas been followed for 2,800 ft. from the north extreme of the Magdalena
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
