xGdog

I can't for the life of me find any saltpeter. Found tons of sulphur and I'm up to 5 diamonds from mining. Searched all shafts in the open mine on my first yland. Started branching off those and all i seem to mine is dirt and sand when I'm a few blocks out from the shafts. Any ideas guys? Would mining from the surface down work. Should i start deep. Anything advice would be nice. I'm aware its super bright white and can't be found on the surface anymore.