From Assumption to Accuracy: How Geotechnical Investigations Transformed Resource Exploration Economics. IEM Journal, [S. l.], v. 87, n. 3, 2026. DOI: 10.54552/v87i3.309. Disponível em: https://iemjournal.com.my/index.php/iem/article/view/309. Acesso em: 8 sep. 2026.