Hard-rock mineral exploration in the Lower 48 involves a lot of re-examination of historic mining districts. A belt of metamorphosed volcanic rocks outcrops throughout the Mid Atlantic and Southeastern states, from Maryland into Alabama, and the first authenticated discovery of gold in the US, in 1799, was made near Charlotte, NC within these rocks. In the dark ages, before GPS, we had to read up on the published accounts of the workings in the professional literature, read between the lines in attempts to translate 19th century nomenclature into 1970s terms, and thus select areas to kick around whilst applying modern ore genesis models. Then the fun began: finding old mine workings covering an acre or two or three within dense forest or brush with nothing more than "approximately 2 miles northwest of Locust Grove, NC" as our coordinates. The dead of winter was actually the ideal time to bushwhack since we'd have rather more visibility due the canopy and understory being bare.
Anyway, in addition to old prospect pits, adits driven into hillsides, inclines, vertical shafts, and remnants of mill structures and occasionally some odd pieces of boilers, etc, we'd find stills. Big stills, small stills, long-abandoned stills, and sometimes stills which had produced a "run" in recent times. We'd find rudimentary low-head dams on tiny perennial spring creeks with a diversion ditch, iron pipe, or rarely wooden flumes carrying cold water to the condenser. We'd find all grades of remnants of mash cookers, but mostly foundations since any copper or iron would be long since removed for scrap value. The more modern stills always had some sort of roofing and we'd even find remnants of dark canvas tarps used as camouflage since spotting stills from the air came into the Revenuers bag of tricks by the 1950s.
When telling my father about these common discoveries, he related how his father, "Mr. Foy" to many in Eastern NC (I'm a 3rd), received many a cured ham, fresh turkeys, and pound after pound of air-dried sausage links during the holiday season. Seems that he had a real and appreciated talent for looking the other way as he routinely encountered working stills while executing his duties as a land surveyor during the 1930s.
Foy