A Miami businessman accused of being the mastermind behind the largest fraud case in Vermont’s history pleaded guilty over a failed plan to build a biotechnology plant using tens of millions of dollars in foreign investors’ money.

Ariel Quiros, 64, the former owner of Jay Peak and Burke Mountain ski resorts in northern Vermont, changed his plea to guilty on charges of conspiracy to commit wire fraud, money laundering and the concealment of material information. Nine other charges were dropped.