Silver is a metal resource added by IC², but not generated as ore. Absent any other mods that generate it, silver is only acquired by processing Gold Ore.
These forms of silver are seen during ore processing (the first two only if silver ore is generated):
Silver has a single use, albeit an extremely important one: crafting Glass Fibre Cables.
- In addition to carrying power tier 5 voltage), these are used to craft the Teleporter, which is used to craft the Advanced Miner and Replicator.
Basic crafting is the same for (almost) every metal. Silver is one of the odd ones out, with nothing but dust to smelt (which does you little good, unless you're making blocks for storage or decoration I suppose).
9 ingots craft into a block and vice versa.
Dust comes from 9 small piles, but you can't craft small piles out of a single dust like you can craft ingots out of a block.
You don't make any parts with this metal yet, but if you did, there's a page for that sort of thing.