Now that I've found some gems, how do I convert them to cash?

Hint 1 of 12:

Hunter, the manager of the Casino, offered to server as your broker for
anything you might find.

Hint 2 of 12:

You should have taken him up on it.

Hint 3 of 12:

Once you have, all you have to do is to get your ore samples to him.

Hint 4 of 12:

He's not around the bar very much.

Hint 5 of 12:

But this is high-tech; surely there must be another way to get the samples to
him.

Hint 6 of 12:

I don't suppose you can fax them...