The 18 year-old lifted a personal best 151kg in the snatch but missed his final two attempts at 188kg and 191kg in the clean and jerk.
He finished with a total of 331kg at the Carrara Sports Arena, seven kilograms behind Venkat Rahul Ragala from India, who also beat him to gold at last year's Commonwealth Championships.
Opeloge said he wanted to win the gold medal but made a mistake at a key moment.
"I'm happy but I didn't beat (the gold medallist)...I missed my gold," he said.
