Well I happened to see the dark mine update very early. Played a quick round untill endless to see what the change does. Its a good change. You most of the time find at least 1 dark mine which is enough that you can just play around the fact that anywhere in that row or collum can be dark mines. And if you dont find a dark mine you can at least be confident in where they arent and it will most likely work from there.
Happy to see dark mine become something other then complete rng suffering.