The media have been highlighting projections produced by the military that show that Afghanistan may have $1 trillion of mineral wealth. It would be helpful to put this figure in some context. The NYT helpfully described this sum as being equal to $38,482.76 for every person in Afghanistan.
It would be useful to note that this is a gross number, it does not subtract the cost of extracting the minerals nor does it consider that these resources would likely be extracted over many decades. If we assume that the cost of extracting the minerals (e.g. foreign produced equipment, foreign trained technicians, profits of foreignh companies and environmental damage -- not counting domestic Afghan labor) is between 25 and 50 percent of the value of the minerals, then the money going to Afghanis would be between $500 billion and $750 billion.
If this money is earned over a 40-year period (Saudi Arabia has been producing oil for 80 years), then it comes to between $12.5 billion and $18.8 billion a year. Afghanistan's population is currently 29.1 million, but it is growing at the rate of 2.5 percent annually. Assuming the growth rate slows, Afghanistan's population will average about 40 million over this period. This means that the revenue from the minerals will average between $312.50 and $470 per person per year. This is still likely to have a substantial impact on Afghanistan's economy, since its current GDP per capita is just $800 on a purchasing power parity basis.