Originally posted by Daynen Drakeson:

Found a double silver vein once. The two veins were practically superimposed over each other. Crazy silver haul.

I've gotten 2 on several occasions. I've seen other people's screen shots of 3 and even 4.

https://steamcommunity.com/sharedfiles/filedetails/?id=2856429325
@OP also forgot to mention silver is only found above the obsidian line in the mountains so small mountains rarely have any. (That's not really a spoiler its just a save yourself some frustration warning.)