Mother lode

Mother lode is a principal vein or zone of gold or silver ore. The term is also used colloquially to refer to the real or imaginary origin of something valuable or in great abundance.

For other uses, see Mother lode (disambiguation).
(Left) Two water-worn gold nuggets from Tuolumne County. They are typical of larger nuggets found by the early California gold rush placer miners (each ~1.6 x 1.1 x 0.3 cm). (Right) Crystalline gold specimen from the California Mother Lode, probably from Tuolumne County (5.3 x 2.7 x 2.4 cm).
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