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Mother lode
Mother lode is a principal vein or zone of veins of gold or silver ore. The term is also used metaphorically to refer to the origin of something valuable or in great abundance. ==Term== The term probably came from a literal translation of the Spanish ''veta madre'', a term common in old Mexican mining. ''Veta madre,'' for instance, is the name given to an silver vein discovered in 1548 in Guanajuato, New Spain (modern-day Mexico).〔Alan M. Bateman (1942) ''Economic Mineral Deposits''. New York: Wiley, p.465-466.〕
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