Once part of the Mount Vernon Furnace, in 2023 the ruins can still be seen at the Moonstone Manor wedding venue.
| 1742 | Samuel Smith |
| 1800 | Henry Bates Grubb |
| 1832 | Edward Burd Grubb |
| 1864 | Edward B. & Clement B. Grubb |
| 1875 | Grubb and Co. |
| 1899 | Dr. H. M. Alexander |
| 1913 | Closed by Samuel Graybill |
| 1913 | Samuel K. Zeager (sawmill) |
| 1934 | Paul Zeager |
| Built | c1832 |
| Structure | 2.5 Story Stone |
| Dimensions | 40 x 60 |
| Water Source | Conewago Creek |
| Township | West Donegal |
| Type | Flour/Grist/Saw |
| Headrace | 300 feet |
| Tailrace | 100 feet |
| Dam Height | 10 feet |
| Power | 1 Overshot |
| Capacity | 8 bbl /day |
