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/iem/article/view/309. Acesso em: 19 oct. 2026.