Afghan miners drill rocks at an emerald mine in the mountains of the Panjshir valley north of Kabul in this April 20, 2007 photo. An explosion booms across the Afghan mountains, bouncing off jagged ridges and setting a clatter of stones off down a slope. But this is not a Taliban bomb or a NATO strike.Miners in the peaks above the Panjshir Valley are blowing their way into the rocks, hunting for emeralds that could make them a fortune in one of the world's poorest countries.To match feature AFGHAN-EMERALDS/. REUTERS/Ahmad Masood (AFGHANISTAN)