Made large ore veins slightly more rare and slightly smaller on average. But the size varies a lot so you can still find huge ones once in a while. We also increased the chance of finding raw ore blocks in the ore veins.

The buttons in the video represent the filler blocks (tuff/granite). I use buttons to make the ores more visible while tuning.

Note that this demo doesn't take into account that caves will erase parts of the ore veins.

https://www.minecraft.net/en-us/artic...