SHANGHAI--Companies in business with Liu Han, a Chinese tycoon with resources investments in the U.S., Australia and Africa, said Wednesday that they are seeking information about his whereabouts following a media report in Shanghai that he had been detained by Chinese authorities.

Sundance Resources Ltd. (SDL.AU) and Moly Mines Ltd. (MOL.AU), two Australia-based companies in which Mr. Liu is a major shareholder, said Wednesday that they are seeking clarification of the report.

Mr. Liu's primary investment vehicle, Sichuan Hanlong Group, is in the midst of a 1.38-billion-Australian-dollar (US$1.43 billion) buyout of the shares it doesn't already own in Sundance, an iron-ore developer focused on Africa. It is also pursuing a major project in Nevada.

His detention was reported Wednesday by Shanghai Securities News, one of three major Shanghai newspapers devoted to market news. The newspaper cited unnamed sources as saying the tycoon was detained along with his ex-wife before they returned to his home province of Sichuan, in southwestern China, after the conclusion of annual legislative meetings in Beijing. The 47-year-old Mr. Liu wasn't a participant in the meetings.

Other members of his family, including his current wife, were detained in Sichuan, the newspaper said.

The report, which didn't provide further details, couldn't be independently confirmed.

A spokesman for Beijing's municipal police department said he didn't have any immediate information on the matter. Officials for the provincial police in Sichuan couldn't be reached to comment.

Police investigators in China routinely detain people for extended periods without charging them, disclosing the detention or allowing those detained access to an attorney.

In the Sichuan capital of Chengdu, Hanlong officials, including the company's spokeswoman, said they didn't have any information about Mr. Liu after trying unsuccessfully to reach him. Mr. Liu is also chairman of chemical maker Sichuan Jinlu Group Co. (000510.SZ), which likewise said in a stock-exchange notice that it had no information about him: "The company can't reach Mr. Liu Han by telephone at the moment," it said.

Sundance Chairman George Jones said Wednesday that he doesn't know Mr. Liu's whereabouts but said he hopes to learn more on Thursday at a previously scheduled meeting with Hanlong representatives in the Australian city of Perth. "We should have more clarity about where things stand after those meetings," Mr. Jones said in an interview.

In the U.S., Hanlong is the principal financial backer and future customer of a $1.3 billion molybdenum-mining project that recently began construction in Eureka, Nev. The mine itself is run by Colorado-based General Moly Inc. (GMO, GMO.T), in which Hanlong holds a stake. General Moly executives couldn't be reached.

Mr. Liu shot to prominence in global mining circles in recent years by pledging more than $2 billion to resource companies around the world through Hanlong. In 2010, Australia's government toasted Mr. Liu as the country's largest single private foreign investor from China after he bought into a molybdenum miner there. Molybdenum is used to harden steel for advanced applications such as piping for nuclear-power plants.

Last year, Shanghai-based wealth-tracking service Hurun Report estimated Mr. Liu's net worth at $1 billion. Last December, the tycoon was the subject of a profile in The Wall Street Journal.

Over the past year or so, Mr. Liu's business empire has been shaken. The global downturn in commodity prices has made some of his mine bids look less appealing, analysts said. Last year, Australia's Sundance said Chinese regulators required Mr. Liu to reduce his offer price for the company because of market weakness.

More recently, according to Sundance, Mr. Liu's Chinese lenders told him to team up with a state-owned company if he wanted to complete his Sundance buyout. Hanlong's slow progress has prompted Sundance to consider other suitors, according to the Australian company.

In 2012, a handful of Mr. Liu's former Hanlong deputies and their family members were charged in Australia's highest-profile insider-trading probe in years. One of them was jailed after admitting guilt, while another fled to China where he has been unreachable. Australian prosecutors haven't identified Mr. Liu as a suspect.

In a late-2010 interview with the Journal, Mr. Liu joked that controversy had dogged him throughout his business career, starting in the 1990s when he began trading in China's nascent commodity-futures markets and drew the ire of regulators and fellow investors. Once, he recalled in the interview, his car was shot up by another investors angered by losses he suffered because of Mr. Liu's aggressive investment style. "They call me, Liu Han, the only survivor'," he said.

In China, Mr. Liu is known primarily as a benefactor of schools in his native Sichuan. Most of his investments are held through his wholly owned Hanlong, which boasts a variety of assets, including infrastructure, winemaking and mining interests. Hanlong shares its Chengdu headquarters with Sichuan Hongda Group Co., a large chemical group Mr. Liu helped launch, which is now run by a cousin.

Liu Canglong, the cousin, told Chengdu media on Wednesday, that he hasn't been in contact with Liu Han in recent days.

-- Chuin-Wei Yap and Yang Jie in Beijing contributed to this article.

Write to Gillian Tan at gillian.tan@wsj.com and James T. Areddy at james.areddy@wsj.com.

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