Fossicking
I've recently been on holiday in NSW, and my uncle gave me a pile of sapphire bearing gravel which he'd added gold to. I had lot of fun sifting through it and I'd love to go back and collect more of the stuff. I got the impression that the minerals in the gravel would glow under UV light, so I bought a UV flood light and some electronics to make a UV strobe. I could use the strobe to tell me if I'm digging in the right place. Only 1% of the bits of gravel glowed under the spotlight so that was a bust. I'm also thinking of looking for gold. I've been thinking a lot about how I could make my own metal detector. I purchased a solder-your-own metal detector kit, MDS-60, and it's not great. I could detect a 5c coin from around 5mm. It's a start, but I'd like to build a metal detector that can compete on sensitivity to small pieces of gold as an expensive unit. Here is a video of the device in action With a bit of fine tuning I was able to achieve detect...