human
Do you know what this is? he exclaimed.
gpt
Quartz! Rotten quartz! And it's heavy with gold.
human
Gold!
gpt
We have stumbled on the place where all that metal comes from, said Dan.
human
This is a mine. See how the passage goes on at a right angle. It was dug to follow the ledge of gold.
gpt
I wonder. These people don't value gold. They use it the way we use any common metal.
human
It's the only metal they know, said Dan.
gpt
And it's common here as old iron is with us.