selfcommander

Picture to the left is what it looks like in game. It is some sort of rock. Definitely not peaks, there were whole row of them by the road

I am sorry, this might be a stupid question, but I can't find answer anywhere. What are those things on the picture? When I walk up to them they look like rocks, but I read about ores and they don't look like them. I tried to hit them many times but nothing happens. What are these? And what to they yield if anything?