Shares of Taseko Mines (TGB) tumbled 5.01% in after-hours trading on Wednesday following the release of its third-quarter earnings report that fell short of analyst expectations. The copper mining company's disappointing results have sparked concerns among investors about its near-term financial performance.

Taseko reported adjusted earnings per share of $0.01, missing the analyst consensus estimate of $0.03 by 66.67%. This represents a significant decline from the $0.02 per share earned in the same period last year. While the company's sales showed some improvement, rising 10.73% year-over-year to $126.313 million, it wasn't enough to offset the earnings disappointment.

The revenue figures also failed to meet market expectations. In Canadian dollars, Taseko's revenue came in at C$173.9 million, up from C$155.6 million a year earlier, but fell short of the C$179.6 million analysts had forecasted. The combination of lower-than-expected earnings and revenue appears to have rattled investors, leading to the sharp decline in the stock price during extended trading hours.