for decades one of the most powerful forces holding down afghanistan has never changed. poverty. the nation's gross domestic product is $12 billion, much of it foreign assistance. but in our number one story tonight, with about 100,000 americans fighting there, what if underneath that nation's mountains lay a fortune in natural resources? a trillion dollars worth of fortune? since the soviet occupation, geologists have known of afghanistan's potential for mineral wealth, wealth that can be unearthed only by mining an industry afghanistan does not have, yet. now the "new york times" reports mr. karzai has been briefed about the findings of a survey by u.s. geologists and the pentagon indicating that afghanistan has far greater untapped natural resources than anyone knew, estimated at more than $1 trillion in minerals, oil and gas. the underground reserves were found in 2006 and -7 by aerial surveys using magnetic and other scanners on the ground below. the findings, the "times" reports, ignored by both the u.s. and afghanistan governments until their discovery by a pentagon task force. while the timing of the story with the on-the-record