Net profit for the first three months of the year stood at 439 million zlotys ($121.08 million), compared with the 453 million zlotys expected by analysts.
Chief executive Jean Sebastien-Jacques said the challenge for the industry is to ensure the benefits from the past frugal years are not lost against a backdrop of rising oil prices and increased political risk.
By mid-morning, Lonmin shares had lost 5.6% of their value in London, while Sibanye’s were down 4.9% in Johannesburg, even though the companies announced they had received the approval of the South African Reserve Bank (SARB).