Swiss-based commodities giant Glencore has extended a deal with Libya’s state oil firm to be the sole marketer of one third of the country’s current crude oil production, sources familiar with the matter said. It was not clear for how long Glencore would continue to have exclusivity over the output and whether some parts of the deal would be renegotiated. The deal extends Glencore’s dominance over rivals such as Vitol and Trafigura in handling barrels from the North African country for a second year running. A spokesman for Glencore declined to comment. Officials at Libya’s state-owned National Oil Corp. (NOC) also declined to comment. Libya has struggled for years to end a crippling blockade of its oil ports amid a civil war and Islamic State intrusions. Between security fears […]