USGS: Geological Survey Bulletin 1286 (Goldbearing Veins
Mar 28, 2006#0183;#32;Most of the veins are confined to a belt about mile wide that trends approximately N. 10#176; W., but some prospecting and perhaps a little mining have been done on the Potomac vein and scattered smaller veins west of the main zone. The quartz veins range in width from a