File:The Quarterly journal of the Geological Society of London (13935560091).jpg

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1866..
BATJERMAN COPPER-MINES OP MICHIGAN.
457
impregnated with copper to a depth of about 20 feet from the lodes.
The mine is 156 fathoms deep, and produces from 35 to 65 masses
weighing about a ton each per month, and about an equal weight
from stamp-rock, containing about 1-9 per cent. The copper-ground,
as a rule, appears to follow the greenstone in depth, dipping about
27° north-westerly. The North and South Cliif mines, opened on
the prolongations of the same lode, are not now at work.
The Central mine, about 14 miles east of the Cliff, is opened upon
a similar lode, consisting of a series of alternations of red laumonite
strings, with large lenticular expansions containing copper. The
original discovery of this lode was made in an old Indian working at
the 'No. 2 shaft, out of which a mass of copper, weighing 50 tons,
was taken. Only a small amount of metal has been found imme-
diately below this point in sinking ; but further north, below the
greenstone, under similar conditions to those observed in the Cliff
mine, a very rich run of ground has been discovered. There is a
good deal of calcspar in the vein, and the finer copper appears rather
in sheets than in shots. At the 50-fathom level, on the No. 4 shaft,
the largest mass that has as yet been discovered on the lake was

struck ; it measured 50 feet in length, 30 in height, and about 4
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Source https://www.flickr.com/photos/biodivlibrary/13935560091
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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36164904
Item ID
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111477 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 457
BHL Page URL
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https://www.biodiversitylibrary.org/page/36164904
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 22 (1866).
Flickr tags
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Flickr posted date
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21 April 2014
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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26 August 2015

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current06:32, 26 August 2015Thumbnail for version as of 06:32, 26 August 20151,170 × 2,049 (575 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13935560091 | description = 1866.. <br> BATJERMAN COPPER-MINES OP MICHIGAN. <br> 457 <br> impregnate...

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