Commodities-trading giant Glencore International PLC (GLEN.LN) said Friday it will not be able to complete its proposed merger with mining company Xstrata PLC (XTA.LN) by March 15, as it had intended, because it is still awaiting regulatory approval from the authorities in China.

Glencore, which is seeking to combine with Xstrata to form the world's fourth-largest diversified miner, said it will provide a further update Tuesday on the date the transaction is expected to complete.

There is no date set for when the Chinese regulatory decision will come through. If Chinese approval is secured, the two companies still have some final work to do in the law courts before the deal can close.

This is the second extension to the deadline for the deal this year. Earlier in January, Xstrata and Glencore gave themselves another six weeks to secure regulatory approvals, taking the final deadline to Mar. 15.

The merger already has the backing of regulators in the European Union and South Africa, and both companies' shareholders. Both sets of regulatory approvals secured so far imposed some conditions on the deal.

The Competition Tribunal in South Africa limited the timing and scope of any layoffs stemming from the merger. The European Union required Glencore to end a long-term contract to sell zinc produced by Belgium's Nyrstar NV (NYR.BT).

Write to Selina Williams at selina.williams@wsj.com; Twitter: @selinawilliams3

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