I know you asked for experienced swingers which I'm mot but any info helps..
I havnt used geovic in a while as it doesn't work on my phone, but I was using it mostly for topo maps, locations of mines and exploration lisences from the past or current. Also in some of the details it lists some info on the areas depending on how much is available. I had to find the Layers page and then out of the list, check the layers I wanted visible to show.
For google, ill research as many keywords as I can with the town or areas name. Follow the bread crumbs to the jackpot details, even if it means having to go to the local library and flick open a smelly old book which you turn manually :lol: The research never stops, you can never know it all or enough on an area, but you can make a picture with what we have. For another example, I could also search for any known uploaded documents online like this say "ballarat geology .pdf" and see what .pdf files come up.
Generally, just knowing where a deposit is ( like a goldfield ) is a great start. I tend to use google earth satellite and street view a lot to see if I can spot any working or ovious changes in geology. Even after all the reasearch you have done and gone through, you arrive at the location and sometimes it still doesn't add up throwing your hands in the air. Where is that gold?? Are you on soft soil.. hard ground.. satellite view shows hard and soft ground with colors, vegetation etc.
Is the area right for your tool? Make sure whatever your using wether it be detector or a form of processing dirt, you want the ground to suit it. Wet, dry, highly mineralised, ironstone..etc. how much gold has been found there before? Always a good piece of info to have under the belt. If lots of gold was found there before, chances are there's still more from many forces.
I know exactly where your coming from, I need to get out there more and swing my Eureka Gold which I'd only expect to pickup above 1 grammers and bigger nugs. When you can't chase the small stuff which tells the tale its complicated and why I choose my trusty pan instead until one day I may be able to afford an sdc. I still have hope for the eureka, but I know my chances with it too. It could find 5 ounces.
Hope this helps and its not jibber jabba