Ponta, meanwhile, announced that his government had changed its mind on the project ahead of the commission vote a statement that followed weeks of protests over environmental concerns and criticism that Romania would earn too little from the deal.
"The ruling coalition intends to reject the project," Ponta said, adding, however, that the government in principle supports foreign investment in its natural resources.
He did not directly say the bill the government sent to the commission was flawed, but Ponta and coalition partner Crin Antonescu said the government intended to adopt broader legislation governing the use of Romania's mines and other natural resources.
In its report, the commission also suggested the need for a better legal framework covering such matters.
The panel also recommended the Canadian company's 1999 license be declassified and made public. It added that there should be "a correct partnership between the main shareholder and the Romanian state," suggesting that Romania stood to earn too little from the deal.
Jonathan Henry, chief executive of Gabriel Resources, told The Associated Press by telephone that he was waiting to see the commission's report and declined to offer further comment.