Albert Pellew Salter (1816–1874) was a provincial

land surveyor Surveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them. A land surveying professional is ca ...

Upper Canada The Province of Upper Canada (french: link=no, province du Haut-Canada) was a part of British Canada established in 1791 by the Kingdom of Great Britain, to govern the central third of the lands in British North America, formerly part of the ...

then

Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central Ca ...

in the mid-19th century. He is historically most notable for having discovered magnetic abnormalities at what is now

Creighton Mine Creighton Mine is an underground nickel, copper, and platinum-group elements (PGE) mine. It is presently owned and operated by Vale Limited (formerly known as INCO) in the city of Greater Sudbury, Ontario, Canada. Open pit mining began in 1901, an ...

Greater Sudbury Sudbury, officially the City of Greater Sudbury is the largest city in Northern Ontario by population, with a population of 166,004 at the 2021 Canadian Census. By land area, it is the largest in Ontario and the List of the largest cities and to ...

, while surveying a baseline westward from

Lake Nipissing Lake Nipissing (; french: lac Nipissing, oj, Gichi-nibiinsing-zaaga’igan) is a lake in the Canadian province Within the geographical areas of Canada, the ten provinces and three territories are sub-national administrative divisions under ...

in 1856. Born at

Teignmouth Teignmouth ( ) is a seaside town, fishing port and civil parish in the English county of Devon. It is situated on the north bank of the estuary mouth of the River Teign, about 12 miles south of Exeter. The town had a population of 14,749 at the ...

Devon Devon ( , historically known as Devonshire , ) is a ceremonial and non-metropolitan county in South West England. The most populous settlement in Devon is the city of Plymouth, followed by Devon's county town, the city of Exeter. Devon is ...

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

in 1816, Salter emigrated to Canada in 1834 and initially settled at

Plympton Plympton is a suburb of the city of Plymouth in Devon, England. It is in origin an ancient stannary town. It was an important trading centre for locally mined tin, and a seaport before the River Plym silted up and trade moved down river to Plym ...

; he was later a combatant in the

Upper Canada Rebellion The Upper Canada Rebellion was an insurrection against the oligarchic government of the British colony of Upper Canada (present-day Ontario) in December 1837. While public grievances had existed for years, it was the rebellion in Lower Canada (p ...

of 1837. He subsequently married in 1839 and taught school while obtaining his degree in land surveying and civil engineering. In 1847, he was hired by the Commissioner of Crown Lands to survey mining locations in the Sault Ste. Marie region. In 1855, he was assigned to survey the North Shore of

Lake Huron Lake Huron ( ) is one of the five Great Lakes of North America. Hydrology, Hydrologically, it comprises the easterly portion of Lake Michigan–Huron, having the same surface elevation as Lake Michigan, to which it is connected by the , Strait ...

, in light of the recent

Robinson-Huron Treaty The Robinson Treaties are two treaties signed between the Ojibwa chiefs and The Crown in 1850 in the Province of Canada. The first treaty involved Ojibwa chiefs along the north shore of Lake Superior, and is known as the Robinson Superior Treat ...

. The following year, he returned to the region to survey the first baseline, and detected the magnetic anomalies as he passed between Round Lake and Whitefish Lake on what is now the Whitefish Lake First Nations reserve. The area was then examined by Alexander Murray of the

Geological Survey of Canada The Geological Survey of Canada (GSC; french: Commission géologique du Canada (CGC)) is a Canadian federal government agency responsible for performing geological surveys of the country, developing Canada's natural resources and protecting the en ...

, who confirmed "the presence of an immense mass of magnetic trap". Due to the then-remoteness of the Sudbury area, however, Salter's discovery did not have much immediate impact. The later construction of the

Canadian Pacific Railway The Canadian Pacific Railway (french: Chemin de fer Canadien Pacifique) , also known simply as CPR or Canadian Pacific and formerly as CP Rail (1968–1996), is a Canadian Class I railway incorporated in 1881. The railway is owned by Canadi ...

through the area, however, made mineral exploration more feasible and finally resulted in the development of a mining settlement in 1883. Salter died in 1874. Salter's Meridian is commemorated by a historical plaque in the

Naughton Naughton ( or ) is an Irish Gaelic surname derived from the name Ó Neachtain meaning 'descendant of Nechtan'. A Sept of the Dal gCais of the same stock as Quinn and Hartigan where located in Inchiquin Barony, County Clare. Another O'Neachtai ...

neighbourhood of Sudbury.Historical Plaques of Sudbury District
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References

Further reading