Executives at Barrick Gold Corp and Glencore expect to receive a new license for their joint venture Kabanga nickel project in Tanzania, having held “productive” talks with the government during the past several months, Barrick said Sunday.

Under changes to Tanzania’s mining license structure put into place in January, Barrick and Glencore have applied for a prospecting license to replace the retention license they previously held on the undeveloped project.

The retention license was due to expire in 2019, and the new license would be good for four years, Barrick spokesman Andy Lloyd said by email.

“Glencore and Barrick expect to receive a Prospecting License and look forward to continuing the constructive relationship that exists with both the Government of Tanzania, and the communities in the area of the project,” Lloyd said.

Reuters reported earlier that Tanzania revoked a retention license for the Kabanga nickel asset, as well as 10 other retention licenses for nickel, gold, silver, copper and rare-earth exploration companies.

Retention licenses act as placeholders for mining companies that want to hold the rights to a deposit, even if they are not planning to immediately develop it.

Under President John Magufuli, Tanzania has been overhauling its mining regulations in an effort to reap greater economic benefits. Barrick’s majority-owned Acacia Mining has been hit hard by the changes, which included a $190 billion tax bill, and has said it would consider selling a stake in some, or all, of its gold mines in Tanzania.

Last month, Acacia said first quarter gold production fell 55%.

Other African nations are also seeking to redraw historic mining agreements. Last week, Toronto’s Kinross Gold Corp became the latest miner to be hit by the possibility of regulatory changes in Ghana and Mauritania.

Earlier this year, Vancouver-based First Quantum Minerals was slapped with a $7.9 billion tax assessment by Zambia. Glencore has been dealing with a dispute over a new mining code in the Democratic Republic of Congo.