treasury; treasure house; storehouse
A physical or metaphorical place where valuable things are stored or concentrated.
This museum is a treasure house of ancient art.
treasure trove; rich source
Often used figuratively for a place, person, or thing that is an abundant source of something valuable, such as information, resources, or talent.
The internet is a treasure trove of information.
His mind is a rich source of ideas.
This website is a treasure trove of information.
This region is known as a treasure trove of natural resources.
源泉 means a 'wellspring' or origin of something abstract like emotion or information, while 宝庫 figuratively describes a place, person, or thing overflowing with valuable things.
蔵 refers to a traditional storehouse building itself, while 宝庫 highlights the richness or value of its contents, whether physical or figurative.
宝庫 means a treasure house or rich source (often used figuratively, like a 'treasure trove'), while 金蔵 specifically implies a store of money or funds.
宝物 means 'a treasure' (the valuable item itself), whereas 宝庫 means 'a treasure house' (the place or source where such treasures are found).
Compound of 宝 (treasure) and 庫 (storehouse). The figurative sense of 'rich source' is a natural extension of the literal meaning.