sheep farmer and landholder, was born in Janetstown, Wick, Caithness, on 15 March 1858, the oldest son of four children of Angus Hamilton and Catherine Sutherland. John Hamilton emigrated to the Falklands in 1880 under contract to the Falkland Islands Company; when his contract expired in 1885, he sailed to Chile and worked at Oazy Harbour, northeast of Punta Arenas. In 1889 he formed a partnership with Thomas Saunders to create estancias (sheep farms) near the Argentine city of Río Gallegos. With Saunders and other Scotsmen, he took nearly two years to drive several thousand sheep and horses overland from Buenos Aires province.
In 1904, Hamilton married Olivia Heap, a Scotswoman who had been a nurse at the British Hospital in Buenos Aires. They had two daughters, Olivia Sutherland (who married a Scotsman in Punta Arenas) and Penelope (who married an Argentine).
Even as his Argentine properties prospered, Hamilton kept a close watch on the Falklands and, when opportunities arose, he began to acquire property there. In 1922, for instance, he bought Beaver Island and adjacent islets from Richard Waldron Thornhill of Punta Arenas, who had inherited them from an uncle. Shortly thereafter he purchased Weddell Island and the Passage Islands, and attempted to buy the Jason Islands. Government objections prevented his buying the Jasons, which were Crown Reserves, but he managed to acquire Saunders Island from the estate of WD Benney in the mid-1930s. He also owned property in Stanley.
While he lived mostly in Argentina, Hamilton was neither a speculator, nor a stereotypical absentee landlord. He took positive action to improve pastures on badly overgrazed Weddell, including stock reductions and replanting of tussac grass, and he imported coniferous seedlings from Punta Arenas for ornamentals and windbreaks. He also attempted to diversify the farm economy through minor industries such as sealing for oil (soon abandoned) and the introduction of exotic mammals such as foxes, skunks and guanacos from the South American continent. The idea was that their pelts, as well as those of South American otters, would find overseas markets. Foxes, of course, have proved a plague to West Falkland farmers and the guanacos never really worked out - though there remains a significant population of them on Staats Island. Introductions of Shetland ponies and Highland cattle, while imaginative, did not long outlast his death.
Hamilton kept much of his money locally, with more than £90,000 in Stanley's Government Savings Bank even during the Great Depression of the 1930s (when he donated several thousand pounds for the construction of lighthouses on East and West Falkland, and improvements to King Edward VII Memorial Hospital). He also researched road-building in Camp at a time when such projects were so visionary as to be almost hallucinatory.
In 1940 Hamilton moved to Buenos Aires because of a chronic eye problem and, when ongoing treatment required him to remain nearby, he purchased a stud farm at Merlo, west of the Argentine capital. He died in September 1945, survived by his daughter Penelope Alvarez.
Unfortunately, Hamilton's Falklands properties became a bone of contention because of their ownership by Hamilton's Argentine heirs. While Hamilton had once attempted to move the headquarters of Hamilton and Saunders from London to Stanley, he ran into complications with Argentina, which may have seen his properties as a foothold in the Falklands. Instead, he incorporated offshore in Jersey. In 1987, five years after the Falklands Conflict, the Hamilton estate finally sold Beaver, Weddell, Saunders and surrounding islets to local residents.