MELBOURNE, Australia -- Queensland coal miner Macarthur Coal Ltd. has become the latest target in a flurry of mergers and acquisitions in the Australian mining sector, disclosing that it received an approach about a potential transaction.

Macarthur didn't identify the party, but traders and analysts say Switzerland-based mining giant Xstrata PLC may be a possible suitor. A spokesman for Xstrata said the company doesn't comment on market speculation.

Macarthur, which has a market capitalization of around A$3.2 billion, or about US$3 billion, said it is in discussions with the third party, which it understands also has approached shareholders.

"At this stage, Macarthur Coal's discussions with the third party are incomplete, nonbinding and conditional, and no formal written offer has been made," the miner said in a statement.

Macarthur's statement sent its shares surging 15% to end at A$15.20 in Sydney trading Monday.

The biggest shareholder in Macarthur is company founder and former Chief Executive Ken Talbot. Analysts say it has been known for some time that he is looking to sell down his 24% holding. Mr. Talbot didn't return calls Monday.

While a bidder may be able to purchase Mr. Talbot's holding, the 17.7% stake held by long-term Macarthur-backer, China International Trust & Investment Corp., looms as a more significant challenge. In addition to being a major shareholder, Citic is a joint-venture partner in several of Macarthur's projects.

However, Macquarie analyst Sophie Spartalis said this may not be a major hurdle to a takeover if the bidder is willing to work with Citic as a joint-venture partner.

Surging coal prices have boosted Macarthur shares, which already had climbed 35% this year before Monday's surge.