I would consider Purchasing Delos Toole's book
Where to Find Yankee Placer Gold
A good Synopsis on potential spots in all New England States with the exception of Rhode Island.
I have it and find it to be a good reference, along with BedRock Maps from the USGS and what you read on this Forum
Deep Tech Vista RG 1000, Deep Tech Vista Gold, Deep Tech RELIC, Garrett prop pointer.....bazooka gold 36" gold trap, Angus MacKirk Grubstake sluice, my version of mikes trommel, echo crevice vac, Gold
right around porter maine area there are mines actually a silver mine but I have a book about western maine and just about any stream and brook in our area you will find some sort of gold!