I just checked the area out and I think your going to have to find an earlier map then anything Ben or Boyd have on site. Here is the top link on Boyds maps https://online.boydsmaps.com/#15/39.8437/-75.0547/njgin24k-x I went back on on the old maps and even the 1931 aerial and see no evidence of a mill pond.Now a saw mill wouldn't have a pond if thats what you speaking of and no evidence that would be visible from an aerial.It would have to be named on a map or evidence found on the ground.If it is a grist mill you seek I"d think you might find evidence of the old dam walking the creek. Boyds Lidar HD covers this area and I see no evidence on there pf an earthen dam either. That would be here if you havent learned to toggle the maps yet. https://online.boydsmaps.com/#16/39.8421/-75.0514/lidarHD-x Sorry i haven't been any help.I think you need older maps.