The Cueva Blanca property should be looked at as well, there is a huge building there sitting right on the top of the Cruz gold bearing Vein. On the Tesoro, there is approximately the same size building sitting on what may be a junction of the C-1 vein with one or more other veins, a nice scenario for a "blow out" of gold mineralization to occur. The Vilcoro appears that it may have had excavation work done as well.

IMO