Ancient Knowledge?Futuristic Technology?

A dowser in the desolate area of South Dakota is looking for minerals. For over 20 years, he's been using dowsing rods and a pendulum. Now he's trying something new. He has built a framework that will improve the accuracy of his pendulum. Before, he used the device over a map of the area he was going to explore. Now , he's in the field and after double checking his readings, he's sure that the mineral deposit is here. When he narrows the location down to a specific area, he'll file a claim.