From bloodhorse.com: Mr. Prospector began his stud career in Florida in 1975. Although regally bred and a horse of brilliant speed, he had never won beyond seven furlongs. Thus, when his son Conquistador Cielo was entered for the 1982 Belmont Stakes (gr. I), many doubted the colt's ability to get the trip. Conquistador Cielo silenced his doubters in emphatic fashion, winning the race by 14 lengths on his way to Horse of the Year honors.
It took nine years for another male-line descendant of Mr. Prospector to win the Belmont, a feat Hansel (by Mr. Prospector's son Woodman) accomplished in 1991. But since then, the Mr. Prospector male line has dominated the race. Of the 20 renewals of the Belmont since Hansel's victory, horses from the Mr. Prospector male line have captured 13: Thunder Gulch (1995), Editor's Note(1996), Victory Gallop (1998), Lemon Drop Kid (1999), Commendable (2000), Point Given (2001), Empire Maker (2003), Birdstone (2004), Afleet Alex (2005), Jazil (2006), Summer Bird (2009), Drosselmeyer (2010), and Ruler On Ice (2011).
It seems ironic that a horse that was pretty much a pure sprinter during his own racing days should have become a fountainhead of Belmont winners. There was more to Mr. Prospector than the label “sprinter” suggests, though. His late trainer, Jimmy Croll, had little doubt that the horse would have stayed eight or nine furlongs, possibly more, had he not been compromised by soundness issues that were at least in part the result of a rushed attempt to make the 1973 Kentucky Derby field. And Mr. Prospector did not possess a pure sprinter's pedigree. While he was a son of the brilliant Raise a Native, his dam Gold Digger had been a good performer over intermediate distances and was by the rugged Nashua, whose wins included not only the Belmont Stakes but two renewals of then-two-mile Jockey Club Gold Cup.
In fact, while Conquistador Cielo was Mr. Prospector's only Belmont winner, the stallion sired several sons capable of winning top races at 10 furlongs, most notably Forty Niner (1988 Travers Stakes and second in the Kentucky Derby, both gr. I) and Seeking the Gold (1988 Super Derby, gr. I). Both have played a role in Belmont history: Forty Niner is the sire of Editor's Note and the grandsire of Drosselmeyer, while Seeking the Gold is the sire of Jazil.
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http://www.bloodhorse.com/horse-racing/articles/63581/mr-prospectors-dominance-in-the-belmont#ixzz1PNtxJEVu