Compare Mitchell's line about the San Tomé mine, "A great power, this,
for good and evil." However, "treasure" carries the double meaning
of subjective character, and "this one" refers not to the silver but
to Decoud. I.e., Decoud (and perhaps skepticism) seems to have been forgotten
by mankind, until Nostromo arrives to ponder his fate and share for a night his
torment.