Wow... and then this:
Dr. John Guilbert (seminal scholar of the porphyry copper model), geologist Clark Smith and I had done extensive geochemical,
geophysical, and other geologic work on extensions of the
identified caldera leading me to identify multiple mineralized
zones: 5 calderas in all. We claimed the East Silver Bell zone
on which we are still working. This caldera is a hidden
porphyry copper deposit which had eluded all other explorers for
50 years... we continue to work with ASARCO, whose patented lands abut ours.