One day, he excavated a large number of old Greek treasures while digging for gold, so he decided to take a wife with whom he could share his fortune.
Let's departure on our digging up of this site. It is more than just digging, we're going somewhere and learning new things with this dig. This is an excavation!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Be careful of the 発 getting shortened.