Abstract: As nonferrous metal mines undergo intelligent transformation, the increasing integration of industrial control systems and information networks has significantly expanded the attack surface, making traditional perimeter-based defenses insufficient against cross-domain attacks and advanced threats. This paper proposes a framework for building a unified security assurance system that incorporates situational awareness technology. It explains the concept of situational awareness, analyzes the core advantages of a situational-awareness-based security assurance framework for industrial control systems and information networks in nonferrous metal mines, and provides a detailed description of the system's construction process and application results. By establishing a closed-loop security framework encompassing "comprehensive perception, intelligent cognition, collaborative decision-making, and automatic response," the system significantly improves threat detection capabilities and the efficiency of cybersecurity responses, reduces operational costs, and enhances compliance. The proposed framework can provide a reference for cybersecurity development in the nonferrous metal mining industry and support the transition toward more intelligent and automated cybersecurity protection in mines.