It's simple idea. Metal detector will detect metal (Impossible!! :O). Of course it will work at some distance. First detector you made, will juz made simple *beep* when it find metal, and you must point it directly to the metal. And it will have short range. Better detector will show you location and distance to the nearest ores, but it may consume more energy.
Other things too. I was thinking about finding players in metal armor, with metal items. But UFO is metal too, so you can find it. Very good detector could be set to search only on surface, or on some axis you choose.
I like the idea, we had this discussion on the other forum like a radar drone that detects metals and enemies. Maybe that can simple lead to research to get a radar done just using metal detectors and sonars research.
I like the idea. It would be very usefull. You wouldn't have to dig up eveything looking for ore pockets.
Good idea, but what if you're looking for something that isn't metal? Some sort of sonic/vibration device such as those used in geology maybe? I certainly like the idea more than a magic potion that makes ore glow anyways.
What if you have a base and you are trying to hide and they just use this op detector to know exactly where to look?
funny. Also I like this idea, it sounds great. I just wish there was a mod like this for minecraft... Anyway. You have my support Great work!