Ero Copper's stock price soared 5.60% during after-hours trading on Monday, marking a significant positive movement for the copper mining company.

The surge followed the company's release of its first-quarter financial results, which exceeded analyst expectations. Ero Copper reported quarterly adjusted earnings of 69 cents per share, beating the analyst forecast of 62 cents per share. Revenue for the quarter came in at $263.17 million, also surpassing the expected $255.55 million.

This positive earnings surprise appears to have driven investor optimism, particularly as the company's shares had fallen 5.5% in the quarter and were down 10.9% year-to-date prior to this earnings announcement.