I have watched both shows. It is well done. Know Kevin Hoagland leader of one of the teams.
Back maybe in 2014 when he was doing Gold Trails TV show he invited me down to a Sierra Nevada mother lode claim of GPAA for a filming of the show to do some blasting. It is the same blaster we have seen in Aztec Gold show intro, blasting the side of a tunnel with red rubber rings on the blast heads.
I am the inventor of it, the SierraBlaster. Kevin is one of the first people to ever see it used. We had fun blasting boulders to get under them for gold. He said on camera that it was the most revolutionary thing for small scale gold mining he had seen in years. He had a blasting license, but SierraBlaster requires no Federal blasting license, no record keeping, etc. That is why he was so impressed.
Am guessing what they are using it for is they can see parallel tunnels in ancient mine they are searching via ground radar and are blasting thru thinking that might be where treasure is. This is same system that GoldRush Whitewater show uses underwater on boulders. This video shows shows Dustin Hurt getting really big gold nuggets under a boulder he blasted, he becomes euphorically happy and giddy, very cool highlight video I never get tried of watching that video. Here is another that shows how it works
Hope one of the teams does find something. It is a long shot, people have been looking for centuries. On other hand sometimes you find things that you were not looking for, maybe Kevin will find a gold deposit.