<--from the same tile.It's not so bad if your working with under q100 minerals, the range is not so wide. If your highest stone is 250 however, you can find rock ranging from 100-250. Sometimes even getting random extremely lower quality stones. I've had a 200+ stone node give me q 60 rocks, for example.
The W10 change reads "slightly randomized" however in the higher qualities this is simply untrue, a range of 100+ in quality is not slight, and creates a tedious task of sorting minerals if you want to optimize it. Looking at each individual stone/ore/coal to make sure it's of use, is a genuine pain in the neck.
In my opinion the quality range of a single tile shouldn't vary more than 5-10 quality.
