Earnings for the second quarter were up 8% annually to $1.57 a share, excluding one-time items, the company announced Thursday. The results surpassed the average analyst profit expectation of $1.52 a share, according the estimates compiled by Bloomberg.

Caterpillar also upped its annual earnings outlook to $6.20 a share from its previous estimate of $6.10.

“While we’d certainly like to see improvement in economies around the world, and more specifically, the mining industry, the stability that we’ve seen this year has helped,” Doug Oberhelman, Caterpillar’s CEO, said in a statement. ” Even though sales and revenues are relatively flat compared to last year, we’ve improved the bottom line with better execution and continued focus on costs.”

The improving margins are a credit to lower manufacturing costs and decreased research and development expenses, which were down nearly $500 million, said Oberhelman. Sales, meanwhile, have struggled, dropping 3% year-over-year to $14.2 billion and falling short of analysts’ expectations of $14.5 billion.

The lower expenses helped offset a weak quarter for Caterpillar’s resource industries, which include its struggling mining business. Revenue from its resource industry segment fell 29% compared to the year earlier quarter. Global mining operations have cut back on capital spending as coal and metal stockpiles remain high and prices low.

Caterpillar’s construction sales, which helped dampen the blow from a dragging mining industry, were up 11% with an 83% improvement in operating profit. The gains were boosted by overall improvement in U.S. construction spending, which was at a five month high in May, according to data from the Census Bureau.

The company said Wednesday that dealer sales of its machinery declined at a slower pace in June than in the three months through May. Sales declined 10% compared to a 12% drop in the prior three months.