you heard it here folks, I have suspicion of basalt delta containing much more netherite than in other biomes. Proof you ask?
mining in regular netherrack: 30 minutes = >10 ancient debris
mining in basalt delta: 30 minutes = ~30 ancient debris
(please know that I was mining at y=15 the entire time.
if anyone can prove me wrong, please attempt to do so.
my theory is that since basalt is harder to mine than netherrack, it makes up for it by increasing netherite spawn.