Ive seen this video before. Interesting video and a lot of work. Unfortunately the point is gold VDI's overlap with many other targets good and bad due to the fact that gold is alloyed with a number of metals in different ratios and sizes. The Deus can ring up gold VDI's from the upper 30's to low 70's. It an unfortunate fact of life I guess. Need some research on how many pull tabs on average one has to dig before a ring pops up.