It really depends on how one looks at the art of dowsing in the first place. A lot of folks have little insight over the topic and most others carry an inherent Biblical fear of some sort; either way it is still in the eyes of the beholder. Personally, my experiences with the art have shown me that a number of real factors are at play in the works. I know from results of my own, that it is a very real function and quite natural to myself and a few others I have met along the trail over the years. I have found gold veins, gold bars, lost mines, Spanish trail markers where one would never think to look and walked straight into apparitions at the end of the "pull". One can never be sure as to what the pull is going to lead to unless years of experience reveals itself in the mind ahead of the destination. Most of the gold found by the Spanish, was located through divination as there were and still are numerous old timers who are very gifted in the craft. These barren patches your looking at are possibly clearings formed by miners cutting wood for the smelter as I have found them to be quite common near mines and furnace sites here in Utah. Some stratigies are at play by the map maker as to where the trees are taken from and the shape of the clearing's outline based on Masonic symbolism. It was left and meant to look natural on the ground, but another map maker who walked and shot the quads coming into an area ahead of a new Don and his party could read them like a book. Every marker trail I have ever encountered, whether it is an actual trail or just map reference, comes in from the N.W. and first lands near the center of the mineral zone. From there, one should begin to find man made markers of a natural design on a more frequent basis. Of course this could mean a lot of hiking around to get oriented with the veins and their directions if they are even noticeable from the surface, but this is where the willow comes into the picture. Based on what I've seen in the past, anybody can feel the area metals with a willow, but only a few are sensitive enough to use a diviner's rod of some sort. I would not waste any money on rods, if a willow doesn't cop a feel for the area. If you wanted to experiment with rods anyway, there are plenty of books in the library on divination that can provide you with the instructions and guide to making and using your own special devices for pennies on the dollar. I prefer the willow over them all. If you have to cut them hours away from your search site, be sure and keep the main stock in a vase or pop bottle full of water until you are ready to hunt as a dry stick will lose it's sensitivities. I have realized results with other types of limbs that were readily available on location, bu don't ask me what kind they were because I don't have a clue. The best tool to have as a hunter is of course the "double box detector" (tf900 best for the buck), but chances are the willow is going to get you in close to where there was once true activity and the real deal. All in all, I still say and will always say that some things out there just have your name on it and you cannot help but to do otherwise in finding them.
Twisted