The old settlement was reinstated on the initiative of a missionary, but in 1936 the river burst its banks and flattened much of the old village, destroying the church and many cultural treasures.

A breakthrough came only in 1993 with a treaty[9] between the residents and the lawmakers concerning an area of 4,739 km2 (1,830 sq mi)[10] and a payment, over fifteen years, totalling C$14.5 million.

Together with the Trʼondëk Hwëchʼin First Nation an agreement has been made with Yukon Energy to supply electricity to Dawson City using the Mayo-Dawson Power Line.

[4] Mayo has a subarctic climate (Köppen: Dfc), with generally warm summers and severely cold winters lasting half the year.

Spring and autumn are very short transitional seasons between summer and winter, with average temperatures rising and falling very fast during these times.