My hunch is the bedrock is yielding large gold placer nuggets and the low cost setup is a form of collecting them during the exploration and follow up to discover the gold veins up stream.
Once the surface deposits are discovered the drilling will commence in a already proven out cropping. All in my opinion of course.
Our innovative collection system at work in Mexico. This closed loop system ensures drilling fluid does not come in contact with the ground. Photo taken at the recently discovered Central Zone at the El Gallo 1 mine.