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Underground, Stockton Borehole Colliery, showing badly broken strata heavily supported by timber in Young Wallsend seam, and later method of systematic roof bolting with timber.
![Underground, Stockton Borehole Colliery, showing badly broken strata heavily supported by timber in Young Wallsend seam, and later method of systematic roof bolting with timber.](https://history.lakemac.com.au/images/dynamic/history/lh-1004-950.jpeg)
Photo Ref: 1002
Creator: Grothen, Mr John
This work by Lake Macquarie City Library is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License
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