mother lode

• Богатый источник чего-либо ценного или обильного, первоначально относящийся к главной жиле золотой или серебряной руды в горнодобывающей промышленности.

A rich source of something valuable or abundant, originally referring to a principal vein of gold or silver ore in mining.

1. Rich source of somethingB2informal

   A rich or abundant source of something valuable, such as minerals, information, or resources.

   Богатый источник

   • The old library was a mother lode of historical documents.
   • The internet is a mother lode of information on almost any topic.
   • The gold mine turned out to be a mother lode of precious ore.