Current coal production is being stockpiled on site, and trucked and stored up at the Provincial Energy Ventures port in Sydney, Cape Breton, for export.
Citing delays in permits from the Greek government, the company said no additional investment would be made into the Olympias and Skouries projects or the Stratoni mine, which it acquired in 2012.
When the company's Pine Cove pit mine stops producing in about eight months, work will begin to turn it into a tailings storage facility with capacity of up to 7 million tonnes.
South Africa holds the world's biggest reserves of platinum, chrome and manganese, but investment in the sector has dropped in each of the past two years as a result of increasing legal uncertainty and labour disputes.
President John Magufuli has asked for a review of a local contract belonging to Petra Diamonds and ordered senior officials to resign over the outcome of a probe into the diamond and tanzanite sector.
While production in August was below normal due to the ongoing disruptions to the company’s operations, Gran Colombia expects to meet its annual production guidance for 2017 of 150,000 to 160,000 ounces of gold.
The world’s largest rough diamond producer by value reported provisional revenue of $505 million compared with $639 million in the same period a year earlier.