I want to take your attention to IR LEd in mineoros.
http://www.rexresearch.com/dobler/dobler.htm
" light meter" can recieve the radiation which is told in link.
a friends saw a man finding gold and copper by light meter called "leningrad 7".
leningrad recieves light and led in mineoro recieves light which is close to microwave.
is it posible to recieve microwave.which is a neighbour band. for leds.