Hi. My information would suggest that area covered is at least from NS909 986 to NS913977. My refferences are, The mines of Scotland. A bibliography by Tom Oldham, still avalibly on the internet, and Memoirs of The Geological Survey of Scotland Vol XVII Lead, Zink, Copper and Nickel ores of Scotland 1921 pages 105 and144. I have not visited the site so thanks for the info. Jeremy