 The southern portion of the line, below Rice Lake, had a second life from 1867 as part of the Cobourg, Peterborough & Marmora Railway & Mining Company.This was a network using the original C&P, a short run known as the Blairton Extension, and the Trent River between the two which was used to ship iron ore from the mines at Marmora to market.The line was successful for some time, until other lines pushed into the Marmora area, while the mines were running out of profitable ore.