The Davis Mines were located in the town of Rowe MA on Davis Mine Rd. A great deal has been writen about this subject put out by the Rowe Historical Scociety. The historical scociety also puts out a nice quarterly report and have been doing so since 1960 something. There could be something on the people you are trying to trace in these. Rowe also has a couple of town history books out there too.... Stop in at the town library.