Swiss investigators said they have questioned several witnesses in the West African nation of Guinea in a broadening criminal probe into whether Israeli billionaire Beny Steinmetz's mining arm paid bribes for the rights to one of the world's largest iron-ore deposits.

The investigators, led by Geneva prosecutor Claudio Mascotto, left Guinea Friday after spending the week interviewing former government officials with ties to Guinea's mining ministry and banking system who were involved in decisions related to the deal, according to people familiar with the investigation. The investigators also met with an attorney representing Mr. Steinmetz, the people said.

The interviews were another indication that individuals tied to BSG Resources Ltd., the mining arm of Mr. Steinmetz's family-owned conglomerate, remains the focus of multiple investigations into allegations that bribes were paid to win mining rights in Guinea's Simandou mountain range, where the iron-ore deposits are said to be among the world's biggest.

The investigation was conducted as part of an inquiry "for corruption of foreign public agents," a spokesman for the Swiss public prosecutor's office said. "Several hearings of witnesses were conducted on site" in Guinea, the spokesman said.

The Wall Street Journal reported in March that U.S. federal prosecutors, in a February briefing with Guinean government officials, said senior executives of BSGR could be indicted in a parallel investigation into the allegations.

Mr. Steinmetz, who is known for his diamond businesses, wouldn't comment. BSGR has denied allegations that it or people linked to it paid bribes for Simandou. BSGR obtained rights to Simandou deposits in a 2008 deal that drew scrutiny at the time.

"BSG Resources is pleased to see the progress of the Swiss investigation with the interviewing of witnesses in Conakry, Guinea," a spokesman for BSGR said. The spokesman said BSGR believes the Simandou assets were "illegally expropriated" by the Guinean government.

The iron-ore deposits in contention were controlled by Anglo-Australian miner Rio Tinto PLC, but, in 2008, the government of now-deceased dictator Lansana Conté took away the rights, claiming Rio hadn't done enough to develop the assets. The government then awarded the rights to BSGR after the firm carried out a $165 million exploration program. BSGR later struck a $2.5 million deal for Brazilian mining giant Vale SA, which specializes in mining iron ore, to buy a 51% stake of the Simandou assets.

The Guinea government later stripped BSGR and Vale of those rights, alleging they were illegally obtained. The country is expected to put them up for auction this year despite a recent plunge in iron-ore prices.

Swiss authorities opened their criminal inquiry in late 2013 after agreeing to assist in a separate investigation by the Guinean government. In August 2013, Swiss police searched Mr. Steinmetz's home in Geneva, according to BSGR, which has said it is cooperating with Swiss authorities.

A key individual in the investigation, Fré dé ric Cilins, was released from U.S. prison in January after serving two years for obstructing the U.S. investigation into allegations related to BSGR and its mining operations in Guinea. Mr. Cilins had worked on behalf of BSGR in Guinea when it was looking into developing mining operations there about a decade ago.

The Guinea government alleges that Mr. Cilins bribed the former wife of Mr. Conté , Mamadie Toure, to help the efforts of Mr. Steinmetz's company to win the rights to Simandou. Mr. Cilins was arrested in April 2013 in a federal sting operation in a Jacksonville, Fla., airport. He pleaded guilty to obstruction of justice last year in a Manhattan federal court but didn't agree to cooperate with investigators.

Ms. Toure, now a resident of Jacksonville, Fla., is cooperating with U.S. officials, according to a person familiar with the investigation. Her attorney, Mary Mulligan, declined to comment.

Vale, which wrote off the $1.14 billion book value of Simandou in 2014, said in March it had transferred its stake to BSGR. Rio still controls half of the Simandou assets, which are divided into four blocks.

Write to Scott Patterson at scott.patterson@wsj.com

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