Mother-lode meaning

The main vein of ore in a region.
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An abundant or rich source.

A mother lode of information.

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The main lode, or vein of ore, in a particular region or district.
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Any source regarded as particularly abundant or rich.
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(geology) A large or rich vein of gold or of another precious mineral from which other branches extend.
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(idiomatic, by extension) Any source of valuable or useful material.
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Alternative form of mother lode.
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Origin of mother-lode

  • Probably from Spanish veta madre (“mother lode")

    From Wiktionary