Reuben Bennett "Sourdough" D'Aigle (1874–1959) was a Canadian prospector who made numerous discoveries in the Klondike, Ontario, Quebec and Labrador.
Although successful with several of these ventures, he remains best known for missing the Porcupine Gold Rush by only a few feet, a huge deposit being discovered directly beside one of his abandoned test digs.
He was so well known that his death was mentioned in Time Magazine, who quoted his easygoing take on his losses in Labrador; "I was just there a darn sight too soon, but I have certainly enjoyed myself.
This was far less impressive, but he nevertheless decided to return the next year, in 1907, with a larger team to make a more thorough sweep, this time digging into the quartz mounds that dotted the area.
In 1919 he was employed by the Ungava Exploration Company and was the first prospector to identify the huge deposits of iron ore around the Wabush Lake Zone in Labrador, Newfoundland.