English version

mother lode

From Longman Dictionary of Contemporary English
Related topics: Earth sciences, Industry
mother lodeˈmother lode, motherlode /ˈmʌðələʊd $ -ðərloʊd/ noun [countable usually singular] American English  1 HETIa mine that is full of gold, silver etc2 LOT/LARGE NUMBER OR AMOUNTa place where you can find a lot of a particular type of objectmother lode of The Sharper Image catalog is a mother lode of men’s gadgets and toys.3 hit the mother lode
Examples from the Corpus
mother lodeThe region is a mother lode of potential support for his candidacy.
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