Cambodia has an estimated 25 different mineral types, from bauxite to zinc, gold, iron, and gems.
Thailand is the world's largest rice exporter, followed by Vietnam, and Cambodia meanwhile exports about 100,000 tons per year.
The leaders of Burma, Cambodia, Laos and Vietnam met in Phnom Penh on Tuesday, vowing closer ties for economic growth.
Agriculture has emerged as a main economic driver for Cambodia, propping up the country in the wake of the 2008 financial crisis.
More than 300 participants gathered Wednesday for a national forum sponsored by the International Finance Corporation.
Cambodia saw two senior-level visits from both countries week, including a stopover Monday by US Secretary of State Hillary Clinton.
Air France suspended service to Cambodia more than 35 years ago, with the country on the verge of collapse to the Khmer Rouge.
In 2002, China announced an undisclosed debt cancellation estimated at the time to be between $60 million and $1 billion.
Cambodia, one of the poorest nations in the world, typically needed aid from both sides to supplement its annual budget and to develop.