The central provinces of Ninh Thuan and Binh Thuan sit atop as much as 560 million tons of titanium and zirconium, the Department of Geology and Minerals reported on Tuesday.
The reserves were identified as part of a VND300-billion (US$15.4 million) project to search for the metals throughout in the two provinces and the southern province of Ba Ria - Vung Tau. The project was launched in 2009.
The new discoveries have brought the country's total reserves to some 650 million tons, Nguyen Van Thuan, chief of the department, said.
Thuan added that next year they will estimate coal reserves in the Red River Delta and adjacent areas again.
The reserves are currently believed to total up to 210 billion tons, but the figure isn't very exact as it was based on boreholes created for oil and gas prospecting, according to the official.