Mining and metal companies are rediscovering the downside of rallying prices: higher costs. A sharp rebound in commodity markets in the past two years put producers in a profitability sweet spot after years of cost-cutting to cope with low prices.
Now, as the upturn matures and the higher cost of energy and other materials starts to bite, some companies are beginning to struggle to maintain margins.
As the quarterly earnings season unfolds, companies from Alcoa Corp. to AK Steel Holding Corp. have seen their shares slump amid signs that cost creep is eating into profit.