Remains of the second mill built at this site in 1795 by Samuel Pusey. Pusey built the stone portion while the frame portion, long gone, was built somewhere between 1844 and 1864 by Mahlon Pusey, Samuel's son. The mill was a 30'X 40' 2.5 story stone merchant grist mill. A merchant mill ground grain mainly for sale to flour merchants as opposed to grinding for local farmers; the miller keeping about 8%-10% of the flour for his grinding fee. The mill was owned in 1899 by Thomas K. Pusey. The history becomes vague in the 20th century, probably closing in the early 1900's. In 1970, the ruins were much as is evidenced today in 2005.

The mill was sometimes described as being on Nickel Mines Cr. or Run. This tributary flows into the W. Br. of the Ocroaro Creek. The name Nickel Mines Run may have extended further downstream at an earlier date. One overshot wheel was powered by a 6' drop with 900' distance from the dam. A 60. tailrace returned the water used by the flour, grist, corn meal, saw, and cider mill. Flour production was estimated at 8 barrels/day.

The earlier mill located where Stewart's Run enters the West Branch of the Octoraro Cr. was built by Matthew Brown in 1743. Later owned by Hieronemus Eckman in the 1870's and John Kincaid in the late 1780's to early 1790's prior to Samuel Pusey buying the old mill in the mid 1790's.