A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . rne gold,; butthe sedimentary accumulations which followed, or the Silurian, Devonian, and carboniferous,(particularly the first of these three,) have been the deposits which, in tlie tracts where theyhave undergone a metamorphosis or change of structure f)y the influence of igneous agency,or other causes, have been the chief nowws, whence gold has been derived. At the Soimanofsk mines, south of Miask, great piles of ancient drift or gravel havingbeen removed fo
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . rne gold,; butthe sedimentary accumulations which followed, or the Silurian, Devonian, and carboniferous,(particularly the first of these three,) have been the deposits which, in tlie tracts where theyhave undergone a metamorphosis or change of structure f)y the influence of igneous agency,or other causes, have been the chief nowws, whence gold has been derived. At the Soimanofsk mines, south of Miask, great piles of ancient drift or gravel havingbeen removed for the extraction of gold, the eroded edges of highly inclined crystallinelimestones have been exposed, wliich from being much nearer the centre of the chain thanthe above, are probably of Silurian or Devonian age. It is from the adjacent eruptive )72 GOLD. serpentinous masses and slaty rocks b that the gold shingle c (usually most auriferous nearthe surface of the abraded rock a) has been derived. The tops of the highly inclined bedsa are in fact rounded off, and the interstices between them worn into holes and cavities, as 812. ??- ^i^rtiiij l1llli)lllM 11 lllLilll! llll>IK\Uli i>> ill.!AUUI i if by very powerful action of water. Now here, as at Berezovsk, mammoth remains havebeen found. They were lodged in the lowest part of the excavation, at the spot markedwi, and at about fifty feet beneath the original surface of overlying coarse gravel c, beforeit was removed by the workmen from the vacant space under the dotted line. The feebleinfluence of the streams (n) which now flow, in excavating even the loose shingle, is seenat the spot marked o, the bed of the rivulet having been lowered by human labor fromits natural level o to that marked n for the convenience of the diggers.—Murchison. It was from the infillings of one of the gravelly depressions between these elevations,south of Miask, that the largest lump of solid gold was found, of which at that time (1824)
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
