File:Longwall history fig 9b.jpg
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| Mine Index(s): | 999-9999 |
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| File Type: | Illustration |
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| Caption | Figure 9b. Showing additional area of roof that miners would cut out above haulageway all the way back to the shaft to make room for mine cars after the roof subsided and compressed the pack rock. |
| Publication | Bauer, Robert A., 2015 (version), History of Longwall Coal Mining in Illinois, Illinois State Geological Survey, Unpublished Manuscript Files, pp. 15. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:22, January 25, 2021 | | 2,101 × 1,319 (800 KB) | Alan.Myers (talk | contribs) |
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