I recently happened upon the archives on the Teesdale Mercury that have been made available online.

http://www.teesdalemercuryarchive.org.uk/ 

The searching isn't brilliant as a lot seems to be OCR from poor copies, but still I found a huge amount of information very quickly.

I've dropped it all into this file incase its of use to anyone with an interest in the area, I suspect there are vast amount of information in the archive for people willing to dig.

http://www.aditnow.co.uk/documents/Lodgesike-Lead-Mine/Teesdale-Mercury-Lead-Mining.pdf 

Pages 1 - 20
History of Lead Mining In Teesdale - 1856 (published at irregular intervals, some parts seem to be missing)
Mentions London Lead Company, Joshua Stagg, Manorgill, Lodgesyke, Eggleston Mill, Skears

Pages 21 - 44
History of Lead Mining In Teesdale - An updated version from 1871
Also mentions Sharnberry, Coldberry, Redgrove, Wiregill

Pages 45-49
Teesdale Miners Strike - 1872

Pages 50-56
London Lead Company and Duke Of Cleveland - 1882

Pages 56-68
Snatches from Memory by a Dalesman - 1897/98 (published at irregular intervals, some parts seem to be missing)
Mentions Lodgesyke, Coldberry, Wiregill, Sharnberry

Pages 69-72
Lead Mining In Teesdale - Coldberry - 1930

Good work Chris.

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A good link, although the OCR leaves much to be desired;

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I wouldn't blame it on the OCR. There's a few on here from Teesdale and that's pretty much how they talk... 😉