Ai Alright, I'll see what I can find. This might sound dumb but is there a way to know if a chunk is new or not? Besides memorizing where you've been?
Not immediately, no. Go out a few thousand blocks, and just dig a hole (mine in between layers 20-40). If not a shred of Quartz has been found within the first 1/2hr of mining, it's safe to assume it's not a new chunk. It's what I did.