Isis' God Power makes your Villagers gather Gold at double rate for a short period of time.  Make sure you are in a good position to maximize your Gold mining while this God Power is in use.

To invoke the blessing of the gods, left click on the Prosperity icon, then left click anywhere on the map, but preferably close to a Mining Camp or Town Center.

"The galleries which they dig ... are not straight, but run in the direction of the metal containing vein, and as the workers are in the dark in these winding tunnels, they carry torches which are affixed to their foreheads ... non nubile children enter these underground galleries ... and lift with great pains the loosened chunks of ore and carry them outside." 

-- Diodorus

