Do we have any accurate figures of deaths during the 1878-1880 St. Lawrence Island famine?
Wikipedia states the population had been decimated, but attributes that to both deaths and migration.
Encyclopedia Arctica states
These are the remnants of a much larger population which was greatly reduced by a severe epidemic and famine which struck in the winter of 1878-79, killing hundreds of people then living in villages on all sides of the island. Since then the entire eastern end as well as most of the north and south coasts of the island have been uninhabited.