I forgot to mention the scale by the way. It's 1,000 by 1,000. This started after about 50,000 blocks away from spawn. I'll give you the seed a bit later, I don't have my computer right now. Each rail represents a mineshaft. I know these are pretty common with their 1/4 chance of spawning in each chunk, but this is way more than what I saw on a 1,000 by 1,000 scale at spawn.
I forgot to mention the scale by the way. It's 1,000 by 1,000. This started after about 50,000 blocks away from spawn. I'll give you the seed a bit later, I don't have my computer right now. Each rail represents a mineshaft. I know these are pretty common with their 1/4 chance of spawning in each chunk, but this is way more than what I saw on a 1,000 by 1,000 scale at spawn.