Longyear was born in
Lansing, Michigan, on April 15, 1850, the son of U.S. Congressman
John Wesley Longyear (1820–1875) and Harriet Longyear (née Harriet Munro, 1826–1917). He had two brothers, Howard and James, and a sister Ida and possibly other siblings. Through his mother, Longyear was reportedly the great-great-great-grandchild of the
Scottish American soldier
William Munroe. In young life Longyear suffered various health problems and was prone to exhaustion. In 1873, when he was 23, Longyear moved to
Marquette, Michigan, and for over 20 years established himself as an expert in identifying iron ore properties for mines. One of the mines he was involved with in
Iron Mountain, Michigan, became one of the largest underground mines in the United States. In 1906, he founded the
Arctic Coal Company with long-time associate
Frederick Ayer and several other small shareholders. Longyear was the main owner of the Arctic Coal Company with headquarters in
Boston, Massachusetts. Longyear had visited
Svalbard in 1901, and bought the
Trondhjem Spitsbergen Kulkompani in 1906.
Store Norske Spitsbergen Kulkompani started as a consortium of Norwegian investors in 1916. It purchased Arctic Coal Company's and Ayer and Longyear's lands and operations on Spitsbergen in that year. They went on to develop major coal-mining operations in the Advent Valley region and at
Sveagruva, originally a Swedish coal-mining operation. == Personal life ==