Labour disputes earlier in the year caused delays in the building of a new plant in its Cullinan mine in South Africa.
Tanzania Mining News
Shares collapsed on the news to close almost 21% lower in London. Barrick, which has a 64% stake in Acacia, also fell in both Toronto and New York.
Early reports claimed that Tanzania had asked foreign workers of the gold miner to leave the country, but a spokesperson for the company denied that story.
It means that the miner, which had revenue of $1bn last year, will pay about $31 million extra in royalties a year.
The miner said it continues to seek a “constructive dialogue” with the country's government to gain assurance that its operations will not be affected by newly enacted mining law.
Weak uranium market and new Tanzania’s regulations named the main culprits.
President John Magufuli has also ordered the mining ministry to freeze the renewal of expired permits.
The two new laws allow the government to force mining and energy companies to renegotiate their contracts.
The company, which owns the Cullinan mine that has produced the two largest diamonds in the British Crown Jewels, said output and revenue will be lower than market expectations.
Hundreds of villagers near the North Mara gold mine in Tanzania invaded the mine for several days last week in an attempt to steal gold ore.
Barrick confirmed chairman John Thornton met President John Magufuli for talks Wednesday, but didn't mention the details of what, if anything, had been agreed.
Government accused the gold miner of operating illegally in the country and said it has been evading taxes.
Barrick's comments come on the heels of a report published this week, which claims its Tanzanian subsidiary has been under-reporting the amount of metal in its shipments to evade taxes.
Shares in gold producer Acacia Mining, one of the firms accused of eluding taxes, fell by more than 18% to 18% to 355.70 pence on the news.
With six drill rigs currently active on site, and two more to follow soon, Acacia expects to increase the resource to 2 million ounces by the end of the year.
Company to launch probe into the causes of the illegal sit-in of nearly 48 hours.
The world's fifth largest gold miner increased production, had stronger cash flows and paid shareholders a dividend in the first quarter of its 2017 financial year.
Stock climbed 12.94%, closing the session at 529p.
After losing money for three years to 2015, Harmony is now focused on finding mines able to offset falling production at its South African operations.
African miner sticking to full year guidance of 780,000 ounces following plant shutdown amid majority owner Barrick's divestment talks.
Tanzanian police have killed 65 people and injured 270 during years of sporadic clashes with villagers at a controversial Canadian-owned gold mine, according to evidence heard by a Tanzanian government inquiry.
The potential acquisition fits in the South African gold producer’s plans to expand operations across Africa.
The diamond will be offered for sale in Johannesburg later this month.
The potential sale of its its 64% interest in Acacia would be part of Barrick's broader strategy of selling non-core assets to reduce debt.
It was found at Petra's Cullinan mine in South Africa, which has yielded several massive gems, including the largest rough gem diamond ever discovered.