File:Geology of the Richmond Basin 1899 Plate LI.jpg

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Captions

Captions

Method of working mine at small depth by use of mule gin

Summary[edit]

Description
English: Plate LI from The Geology of the Richmond Basin published by USGS, which has the following caption:
Method of working mine at small depth by use of mule gin, Bingley slope, Blackheath area.
The text of the report refers to the figure as follows:
Extent of the coal beds.—As to the area of the basin underlain by the coal beds, the evidence may be stated as follows: On the eastern margin, where the beds are best placed to be exposed in natural sections (see PI. LI), and where they have been most extensively worked in former years, there is a fair presumption that the deposits are substantially continuous. Where, as is shown on the map, the coal beds have not been found, as is the case in two considerable sections of the eastern border, the failure of the slight explorations to disclose them may be fairly explained by the existence of faults which have thrown the beds down or up, so that the shallow pits which were sunk did not pass through the deep surface rubble. So far as has been learned, there were no indications in the old workings that the coals were fading out in the directions of these portions or the margin where they have not yet been found. In the blank north of the Clover Hill mines the streams run so near the position of the outcrop that exploration has been discouraged by the difficulty which would evidently be encountered from surface water.
Date
Source Nathaniel Southgate Shaler and Jay Backus Woodworth, 1899. Geology of the Richmond Basin, Virginia. U.S. Government Printing Office. United States Geological Survey.
Author USGS

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