“Yes, a coffer dam has been built to keep the water out. The rock near the top is fairly soft and that is probably why the muck on the bottom of the swamp hereabouts contains gold. The colors or particles of the metal run very fine, but they are profitable to mine. At least Martinengo finds it so. For that work suction dredges are used. Oh, you’ll get better acquainted with the whole business soon.”