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mother lode

1. In mining, the main source of a mineral in given area. We haven't hit the mother lode of silver quite yet—but we will!
2. By extension, an abundance of something. I wasn't looking to expand my record collection, but I sure hit the mother lode when I cleaned out my parents' attic! It's an exciting time to be a researcher in this field, as a mother lode of new data was recently released.
See also: lode, mother

a mother lode of something

a large collection of a particular type of thing His collection of letters and papers is a mother lode of information for writers and journalists.
See also: lode, mother, of