Take out your Stagbreaker or Iron Sledge; smack the ground.

If you're not near any Obsidian, you will see "Too Hard".. and that's how you know Silver is nearby.

I sequence-broke and went to the Mountain before even beating Bonemass.. ended with me yeeting carts full of Silver off of said Mountain to craft everything my greedy viking hands could craft.

Anyways, beware the strange rock formations, for these are actually Stone Golems and they hit very hard. There are two types, also: pointy bois and smashy bois. Best way to fight them, if you have trouble parrying them, is to just hop up on a rock where they can't get you and hit them over and over with the Iron Sledge.