gold mine of information

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gold mine of information

Something that yields a lot of valuable or useful information. I've never met any of these relatives before, so your photo albums will be a gold mine of information.
See also: gold, information, mine, of

(a) gold mine of information

Fig. someone or something that is full of information. Grandfather is a gold mine of information about World War I. The new encyclopedia is a positive gold mine of useful information.
See also: gold, information, mine, of