The quarry, the chest, the waiting spots and the lanes are now one dirt map. It grows to fill the window while staying a portrait shape: on a desktop the tiles grow to about twice their old size.
Each group of imps is a colored crate with its count on the lid. Lanes are columns of crates.
Tapping a lane slides its front crate onto a free waiting spot. The door on its side swings open and the imps that can mine march out. An empty crate goes away; one with imps left keeps its spot.
Waiting crates hold their spot instead of shuffling along. When tiles open up, every crate that can reach one opens at the same moment.
TREASURE!