The Canadian miner said it wasn’t aware of any "material change" that would account for the sharp price rise in its stock on Thursday and into early trading on Friday.
Recent blazes involving Tesla Inc. and NIO Inc. cars in Greater China are prompting the industry to take steps to alleviate concerns from potential customers.
Europe's second-largest copper producer also posted its best quarterly results in the last three years, with revenue rising by PLN 1.2 billion (about $312 million).