Sailingstone, its second biggest investor, flagged its vote in an open letter last month, citing governance issues and the board's lack of engagement with minority investors.
The world's second largest bullion miner is preparing its Zambian copper mine Lumwana for sale in the second half of 2019, looking to target Chinese buyers.
Pembroke has been talking to potential customers and is also open to selling a stake in the mine that will eventually produce 15 million tonnes of high-quality coking coal a year.
The company said on Tuesday first-half headline earnings is expected to rise at least 160%, boosted by higher iron ore export prices and a weaker rand/US dollar exchange rate.
The US faces stiff challenges as it moves to create its own electric vehicle supply chain, with the extent of the country's metal reserves largely unknown and only a few facilities to process minerals and produce batteries.
Poland's prime minister and other government officials will meet on Tuesday to discuss a threat by Australia's Prairie Mining to sue Warsaw over difficulties it faced in developing coal projects.
Prices of 65% iron-content ore for delivery to China hit a five-year-peak of $110.5 a tonne on Thursday, while its premium to benchmark 62% ore widened to five-month highs.
