Updated from Oct. 7

Alcoa's

(AA) - Get Report

third-quarter earnings were little changed from a year ago, as higher mining costs and softness in some key sectors offset a 12.5% jump in revenue.

The stock fell 37 cents, or 1.1%, to $33.71 Friday morning.

The aluminum company earned $283 million, or 32 cents a share, in the three months ended Sept. 30, compared with earnings of $280 million, or 33 cents a share, last year. Revenue was $5.98 billion in the most recent quarter, compared with $5.31 billion a year ago and $6.07 billion in 2004's second quarter.

Alcoa earned $298 million, or 34 cents a share, from continuing operations in the most recent quarter, matching estimates compiled by Thomson First Call. The consensus revenue forecast was $6.02 billion.

Softness in the automotive, consumer packaging and European fabricated aluminum markets hurt revenue growth in the third quarter, while higher input costs, particularly in Europe and North America, crimped profitability. The company also cited price increases for petroleum-derived products like resin.

Alcoa's results were also hurt by a strike at a Quebec smelter and by Hurricane Ivan, which harmed a port near a refinery in Jamaica.