LONDON--Commodities titan Glencore Xstrata PLC (GLEN.LN) reported Tuesday higher first-quarter copper and coal output and lower zinc production while its marketing activities performed in line with expectations.

It also said that it approved the construction of the Askaf North iron-ore project in Mauritania, marking the company's first attempt to develop its own iron-ore production. The 7 million-ton-a-year iron-ore project is forecast to cost $0.9 billion to build with first production expected in early 2017.

Among the diversified miners, Glencore Xstrata has the biggest exposure to copper. The FTSE-100 miner and trader produced 382,000 metric tons of mined copper from its own concentrate during the three months ended March 31, up 24% from the same quarter a year earlier. The increase was due to higher output from its Congo mines and improved performance from certain mines in Latin America and Australia.

Glencore also said that its marketing activities across all business segments during the quarter were "strong and in line with our expectations." The marketing activities accounted for about 40% of last year's adjusted earnings before interest and taxes.

Own-sourced coal production, another key earnings driver after copper, rose 4% to 34.1 million tons in the first quarter compared with the same quarter a year before when a lengthy strike dented output from the Colombian Cerrejon mine.

Zinc output fell 18% on year to 306,000 tons in the first quarter due to the closure of its Perseverance and Brunswick mines in June 2013.

Write to Alex MacDonald at alex.macdonald@wsj.com

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