any collection of valuables that is discovered; "her book was a treasure trove of new ideas"; "mother's attic was a treasure trove when we were looking for antiques"
If you describe something or someone as a treasure trove of a particular thing, you mean that they are a very good or rich source of that thing. The dictionary is a vast treasure trove of information
In England such treasure belongs to the crown; whereas similar treasure found in the sea, or upon the surface of the land, belongs to the finder if no owner appears