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[Bibliographies] [Nanaimo Mine Tour] Coalfields of Vancouver Island (and other delightful places): a Virtual Library |
“The uninitiated may think that one coal seam is very much like
another, and even that all seams may be worked to advantage on one plan.
As a matter of fact, there is endless variety, both in the natural conditions
of the seams, and in the means best adapted for working them.
Coal seams are found varying in thickness from a few inches to thirty feet or more, and lying at all angles between a horizontal and a vertical line; differing much in hardness and texture; often containing bands of stone or clay interstratified with them some of them; liberating during the process of working large volumes of explosive gases, while others are entirely free from gas; some dry and dusty; others abounding in water. Sometimes the “roof” will stand without any support over considerable areas of excavation, and sometimes it will break down the strongest supports. Similarly the “floor” is sometimes hard and firm, and sometimes it heaves up readily when the coal has been removed. All seams have been subject, more or less, to geological dislocations – “faults,” “dykes,” “nip-outs,” and “balks” – and these, being in many instances previously indeterminable quantities, are apt to disturb the best-laid plans of development and working.” |
... as found in the Preface, pages v and vi, of Colliery Working
and Management, written by H.F. Bulman and R.A.S. Redmayne, published
in London by George Lockwood and Son in 1896. These words stand true 105
years later, as they have been amply borne out by the experiences of the
colliers of Vancouver Island.
The address of this document is: http://www.westwatermining.com/library.html.
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document was most recently revised on July 2, 2011. Copyright to original
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