Brian Cameron, from Edinburgh University's Geosciences, says:
Check out the photographs and other information on the British Geological Survey website.
There are images of the Oil Well at D'Arcy http://www.bgs.ac.uk/opengeoscience/
This website has just come online, search for Dalkeith. Also try the Scottish Mining Museum in Newtongrange.
There is information and photographs on their website under 'Museum collections' http://www.scottishminingmuseum.com/.
You may find the information you are looking for.
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