The miner, which keeps is books in U.S. dollars, said the profit amounted to $2.82 per share in its latest quarter, up from a profit of $206.7 million, or 48 cents per share a year ago.
Revenue for the quarter totalled $708.8 million, up from $705.2 million.
Kazakhstani miner Eurasian Natural Resources Corp. PLC. bought First Quantum's Congolese assets, including the Kolwezi tailings project, as well as the Frontier and Lonshi mines and related exploration interests for $1.25 billion earlier this year.
First Quantum had written off the value of the assets in 2010 after its operations in Congo were nationalized by the government of the mineral-rich central African country.
The company has said it will focus its efforts on Zambia where it has its flagship Kansanshi mine and is developing other projects including a new mine and smelter.
Shares in the company, which reported its results after the close of markets, were down 46 cents at $20.01 on the Toronto Stock Exchange on Wednesday.