. Transactions. 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. yxx\x> XKXXX> xxxx>xx^ x>xxxx>xxxx> XXX x> 30 Fia. 31. -Sketch of Cut 4, New Norte, to Illustrate Surviving Fragments ofDiORi
. Transactions. 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. yxx\x> XKXXX> xxxx>xx^ x>xxxx>xxxx> XXX x> 30 Fia. 31. -Sketch of Cut 4, New Norte, to Illustrate Surviving Fragments ofDiORiTE IN Ore. mine to the south extreme of the San Antonio. The old summit of thehill with outcropping ore was about 1,000 ft. above tide, while the lowestexploratory tunnel which was cut is 500 or 600 ft. lower. Thus the whole arrangement of the orebodies is an elongated one,such as would arise from mineralization along a fissured strip. One canhardly imagine such a long and relatively narrow slab or series of slabsto be torn off in depth and floated up edgewise into their presentposition. On the contrary, the structure of the ore, reproducing the TW 20 Up Fig. 32.—Mass of Diorite in Ore, Cut 3, New diorite appeared to be a surviving fragment from a fault breccia. interlacing feldspar, the associated pyrite, the quartz and the garnetsconstantly remind us of replacements by just such emissions as we gener-ally believe have produced
Size: 2697px × 926px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
