Critical minerals are vital for national security, economic growth, renewable energy, and infrastructure. Their assessment involves exploration, mineral identification, and mapping distribution in ores. Traditional analysis methods are labor-intensive, slow, and error-prone. This chapter introduces the integration of additive manufacturing and chemical sensing for critical mineral assessment. Mining operations face challenges in detecting hazardous gases, requiring advanced monitoring for safety and efficiency. We discuss common gases, their risks, detection technologies, and best practices for safe mining. Sensors enhance safety, profitability, and sustainability by enabling process monitoring, analysis, and optimization. They can be deployed on automated robots, drones, or stationary systems in mines and plants, supporting automation and efficient workflows. Additive manufacturing enables the development of advanced sensors, drones, and robotic systems with lightweight, durable, and high-performance materials, while also supporting future concepts like remote mining, on-site repair, improved geological understanding, and modular automated haulage systems.