Except for metal detectors and floating suction dredges, there is no new technology for prospecting. Prospecting is all about testing the ground for bits of gold. When you find gold you track it back to try to find it's lode source. I can't imagine any way to prospect that hasn't already been used.
If you are a multi-million dollar mining company then I'm sure there are some satellite images, lidar images and core drilling you can use to prospect. The rest of us are still using our rotary phones.
If you find some new method, be sure to let us know!