He served as the Minister of Steel and Mines from 1971 until his death in 1973.

Campbell served in the provincial cabinet as Minister of Mines.

As of 2011, he is Minister of Energy and Mines.

From 1911 to 1912, he was the Minister of Mines.

From 1987 to 1988, he served as parliamentary assistant to the Minister of Mines.

In 1946, he was named Minister of Lands and Mines.

He was the Minister of Mines from 1954 to 1960.

In 1936 it was superseded by the Minister of Mines and Resources.

From 1930 to 1935, he was the Minister of Mines.

He later served in the cabinet as Minister of Mines.