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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 182

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181. ing channels are commonly called are encountered in mining the work must cease for a time, until drill holes can be put down for the purpose of locating the coal on the opposite side of the channel. If the channel is not too wide or if the material filling it is not treacherous the work may be driven through it. If, on the other hand, these conditions obtain and if there is sufficient coal beyond the old channel a new shaft should be sunk.
 
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