INFO: In Minecraft 1.4.7 and below, this item requires the mod 'RedPower' by Eloraam (if not using IndustrialCraft 2 version 2.x)
As of IndustrialCraft 2 version 2.x, tiny piles of silver dust can be obtained by processing crushed gold ore (put gold ore in macerator) or purified crushed gold ore (put crushed gold ore in ore washing plant, along with water) in a thermal centrifuge (look in "Recipes and Resources"). 9 tiny piles of silver dust create 1 silver dust, which is (must, in this version) be used for Glass Fibre Cable.
Note: IC2 does not generate Silver Ore in the world. Use the above mentioned way to get Silver.