Bonanza

(n.) In mining, a rich mine or vein of silver or gold; hence, anything which is a mine of wealth or yields a large income.

Thesaurus Entries

Eldorado, Golconda, abundance, affluence, ample sufficiency, ampleness, amplitude, avalanche, bountifulness, bountiousness, bumper crop, copiousness, cornucopia, eldorado, extravagance, exuberance, fertility, flood, flow, foison, font, fount, fountain, full measure, fullness, generosity, generousness, gold mine, gravy train, great abundance, great plenty, gush, house, landslide, lavishness, liberality, liberalness, lode, lots, luxuriance, maximum, mine, mine of wealth, more than enough, mother lode, much, myriad, myriads, numerousness, opulence, opulency, outpouring, overflow, plenitude, plenteousness, plentifulness, plenty, prevalence, prodigality, productiveness, profuseness, profusion, quantities, quarry, repleteness, repletion, resource, rich harvest, rich lode, rich uncle, rich vein, richness, riot, riotousness, scads, shower, source, source of supply, spate, spring, staple, stream, substantiality, substantialness, superabundance, teemingness, treasure, treasure trove, treasury, vein, wealth, well, wellspring