Gypsy, your comment about keeping a journal makes a good point. I've been keeping a Journal of Discovery (loosely named after Lewis & Clark and their 'Voyage of Discovery') for the past several years. I jot down little bits of info and try to piece them together every so often. This method led me to (re)discover an old site that I was able to explore and exploit. Then I wrote about the place and made another $250.00 when I sold the story to a magazine. (There's more than one way to make a buck!) For that particular spot, I got clues from 2 old books, one motel clerk, and a conversation I overheard at a restaurant in the vicinity. Added together, thanks to the notes I had jotted down over the space of a couple years, I was able to locate the site and find some goodies. Had I relied on memory alone, I probably would have failed to make the connection and put all the pieces together.
I also jot down notes of places that I plan to hunt at a future time but am unable to hunt at the current time. I'll drive past a place on the way to an appointment and maybe don't have time to hunt it right then or I'm not dressed propertly for digging in the dirt. So I take out my journal and write down the details, sometimes even jotting down the GPS coordinates, then I visit the place the next time I get the chance. I also write down the types of things found and the dates of coins so I can get an idea of the age of the place.
Detective work is right. Once there was a newspaper article about a guy who was shooting his .22 pistol off in a crowded swimming area. Law enforcement showed up and ran the guy off, but didn't have any proof that he was the one doing the shooting (I guess the witnesses pointing to the gun in his belt wasn't enough "proof.") so they just let him go. A day later I went to the location and used my detector to find his shell casings and a couple pieces of lead. I figured I had all the "proof" the cops could use, but they never pursued the issue so I dumped the evidence in the trash can outside the police station. So much for the professional detectives doing the detective work....