1900  Then he put Tom Dixon in charge of his mines . . . promised to be back before the first mush-ice ran, and took passage on an up-river steamer.
1935  In crossing a small upland river that morning they had broken through the rotten "mush ice" and lost their packs, guns, and almost their lives.
1940  The Coppermine River began to freeze over and a ribbon of mush-ice spread out into the gulf.
1966  They came . . . poling and tracking against the slowly drifting mush ice of the fall. . . .