The mill is located where the Zanoni Spring arises from openings in the Roubidoux Formation, an Ordovician unit of mixed sandstone and dolomite.[5] The spring discharges at the base of a ridge above Pine Creek, a tributary of Caney Creek which discharges into Bryant Creek just above its intersection with North Fork River and Norfork Lake.[1] The discharge of the spring is 0.8 cubic feet per second (0.023 m3/s) or 500,000 US gallons (1,900,000 L) per day.[5]
