bonanza

[buh-nan-zuh, boh-]
noun
1.
a rich mass of ore, as found in mining.
2.
a source of great and sudden wealth or luck; a spectacular windfall: The play proved to be a bonanza for its lucky backers.

Origin:
1835–45, Americanism; < Spanish: literally, smooth sea (hence, good luck, rich vein of ore), nasalized variant of Medieval Latin bonacia, equivalent to Latin bon(us) good + (mal)acia calm sea < Greek malakía softness (malak(ós) soft + -ia -ia)

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World English Dictionary
bonanza (bəˈnænzə)
 
n
1.  a source, usually sudden and unexpected, of luck or wealth
2.  (US), (Canadian) a mine or vein rich in ore
 
[C19: from Spanish, literally: calm sea, hence, good luck, from Medieval Latin bonacia, from Latin bonus good + malacia dead calm, from Greek malakia softness]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

bonanza
1844, Amer.Eng., from Sp. bonanza "a rich lode," originally "fair weather at sea, prosperity," from V.L. *bonacia, from L. bonus "good" (see bene-).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The state's oil boom is no guaranteed bonanza for higher education.
The bonanza came at a cost to forests and wildlife, though.
But what made the whole thing such a bonanza for the humpbacks was the absence
  of sea ice.
Car companies that didn't cash in on the preceding bonanza are now focusing on
  putting money into their testing facilities.
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