I found the location of David Sanders Gris and Lumber mills, shop, his home and the home of Benjamin Franklin read on a 1858 map of Whitely, MA on the Whatley Historical Society page.
Here is the full map:
1858 Map of Whately, MA |
The properties are in the south central area of the map and here is a close up showing them. David Sanders is labeled David Saunders on the map and Benjamin Franklin Reed ids R.F. Reed.
Close up of Mill location, Whately, MA |
Here is a currently map of western Massachusetts for reference: