SNC-Lavalin says its earnings plummeted in the third quarter due to unfavourable conditions at two oil and gas projects in the Middle East that the engineering and construction company has previously warned will hurt its 2016 results.

The Montreal-based firm earned $43.3 million for the three months ended Sept. 30, compared to $224.2 million a year ago when it recorded a $145.7-million gain from the sale of its stake in the Ambatovy Nickel Mine Project in Madagascar. Excluding one-time charges, SNC-Lavalin earned $67 million or 45 cents…