Is that one of the oil-shale mines to the West of Edinburgh?Chris.
A bit on the oil works also a few interesting pics on Google.http://canmore.rcahms.gov.uk/en/site/85566/details/philpstoun+shale+oil+works/
During the NAMHO conference in 2009, I visited Philipstoun No. 6 which as I recall was easy to get into. Just a hole in a field. A reasonable amount to see, but very slippery underground!Chris.