it should be noted that Federation Starships no longer dispose of used dilithium. it was believed that dilithium only occurred naturally (which led to their being valued at roughly 300 times their weight in diamonds), however recent discoveries have led to its being synthesized.* As such, most Federation bases no longer dispose of used dilithium, and instead recrystallize it using gamma radiation.
"We've secretly replaced the Dilithium crystals with Folger'* dark roast crystals. Let'* see how long it takes for the Enterprise crew to notice..."