Parts of an underground mine that are not being ventilated shall be:

• A. Effectively barricaded
• B. Signed for restricted access
• C. Left open for inspection
• D. Marked with caution tape

Answer: (A)

The correct choice emphasizes the importance of safety in underground mining operations. Effectively barricading parts of an underground mine that are not being ventilated serves to prevent unauthorized entry and protect workers from potentially hazardous conditions. When areas lack proper ventilation, they can accumulate toxic gases or have reduced oxygen levels, creating dangerous environments.

Barricading ensures that these zones are clearly defined and that individuals cannot inadvertently enter them, thereby reducing the risk of accidents or health issues related to poor ventilation. In contrast, while marking with caution tape or signage may indicate restricted access, these measures might not be sufficient to completely prevent access or to ensure safety in an unventilated area.