mother lode ( synonym found)
Definition of mother lode:

°A large or rich vein of gold or other precious material from which others extend.
°(by extension) Any rich ore, or source of other useful material.
"The library was a mother lode of information on the subject."
Definition of mother lode:

°A large or rich vein of gold or other precious material from which others extend.
°(by extension) Any rich ore, or source of other useful material.
"The library was a mother lode of information on the subject."
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