treasure trove

English Thesaurus

1. any collection of valuables that is discovered (noun.group)

hypernym	:	accumulation, aggregation, assemblage, collection,
definition	:	several things grouped together or considered as a whole (noun.group)

2. treasure of unknown ownership found hidden (usually in the earth) (noun.possession)

hypernym	:	hoarded wealth, treasure,
definition	:	accumulated wealth in the form of money or jewels etc. (noun.possession)