. Transactions . the losses would per cent, and in the latter, 7 per cent. Such adjustments are,however, only possible where the ores and residues are systemati-cally sampled and assayed. Postscript. In my paper on Quicksilver Reduction at New Almaden,Transactions, Vol. XIII., in the footnote on page 578, there is an EXHIBITION OF BANDED STRUCTURE IX A GOED VEIN. 265 error which T desire to correct. The connecting bar of the H-piecethere referred to is said to carry the platform with rails, etc.,whereas, the platform is fixed above it; and the oscillating motionmentioned a few lines be
. Transactions . the losses would per cent, and in the latter, 7 per cent. Such adjustments are,however, only possible where the ores and residues are systemati-cally sampled and assayed. Postscript. In my paper on Quicksilver Reduction at New Almaden,Transactions, Vol. XIII., in the footnote on page 578, there is an EXHIBITION OF BANDED STRUCTURE IX A GOED VEIN. 265 error which T desire to correct. The connecting bar of the H-piecethere referred to is said to carry the platform with rails, etc.,whereas, the platform is fixed above it; and the oscillating motionmentioned a few lines below, should be described as given to theH-piece, the following reference to apron, platform, and ore-carbeing omitted. NOTE ON AN EXHIBITION OF BANDED STBUCTUXE IN A GOLD VEIN BY CHARLES M. KOLKER, NEW YORK CITY. I desire to put on record this memorandum and accompanyingsketch of a vein examined by me, in Honduras, Central America,which exhibits a well-marked banded structure. The illustration isof natural size :. c b a b c d Gold-bearing Vein in Honduras, showing banded structure. The vein traverses trachytic porphyry. It is from three to fourinches wide. The central band,«, is of white quartz, one inch wide 266 NOTES ON CERTAIN IRON-ORE DEPOSITS IN COLORADO. it is full of cavities and vugs, lined with quartz crystals, and itsmass is largely stained with the hydrated oxide of iron, in which is aheavy sprinkling of coarse gold, indicated by dots and shading in thesection. On each side of a is a band of pure white crystalline quartz,b, § to J inch wide, showing incomplete crystals in radial band contains no gold. Next follows a band, c, on each sideof b, from f to J inch wide. Through its centre runs a fine fissure,lined with interlocking quartz crystals, on each side of which isbluish ribbon-quartz, containing very finely impregnated outside band, d} also varies from J to § inch in width, and ismade up of compact but columnar quartz, the outside face of w
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
