reply of zobex but misposted in "marks by nature forum"
zobex said: The official 1945 rule is, no deposit below 230 feet. Taking in account soil erosion or wash down deposit, if you go beyond 230 feet, you are in the wrong spot. Vertical pit deposits are nearly always straight down, not down 100 feet then turn and lateral 100 feet kind of thing.
Yes, I know the Ayala Corp went down 230 feet on Bohol island and found a very good deposit. Took them almost 2 years of covert digging. Think about it, a 2 meter x 2 meter hole, all reinforced going down 230 feet. I would prefer a hard bunker deposit with explosives. At least once you hit a cement wall, one knows where they are at. Boobie traps are not as scary as going down a 230 foot shaft.
Z