This book has some descriptions of the lost Breyfogle gold mine. It has about 3 pages on it a map. If you click on the picture it has a look inside option so you can read it without buying it if you just want to see those couple of pages.

“Handy guide to the long-lost mines, rich veins of ore, silver lodes, buried treasure, and other bonanzas. All fully described, including fascinating anecdotes about the treasure, its general locale and other information. Each description also accompanied by a map of the region. 96 maps and over 50 other line illustrations.”