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In 2372, the USS Voyager crew detected deposits of polyferranide on a Delta Quadrant moon, though they were contaminated with astilines. They later found pure deposits on the planet of the Sky Spirits. The Sky Spirits gave them some polyferranide, but didn't allow them to mine all that they needed. (VOY: "Tattoo")
Later that year, Voyager away teams scouted the moons of Drayan II and found them rich in polyferranide. Captain Kathryn Janeway attempted to negotiate with First Prelate Alcia of the Drayans for mining access, but she was rebuffed. (VOY: "Innocence")