Afghanistan's mineral wealth is no longer as important as it was when we invaded. At that time the only large known deposits of lithium, like for batteries, were in Bolivia and Afghanistan. The Bolivians were not playing ball, they have been pissed at American corporatists since Bechtel tried to own the rain there.
But that was a long time ago, in the meantime we have discovered a large domestic deposit of lithium. The oil pipeline was often discussed but the real prize there was the lithium, which we no longer need from there.

Good luck switching from dollars to the Euro which is shitting the bed. At the end of the day they can pick of they want to do business with the US or Iran and that is an easy choice for anyone.