Under what condition may more than two temporary stoppings be installed adjacent to the last line of cut-throughs?

• A. If the mine is new.
• B. If the line is under maintenance.
• C. If authorized by the ERZ controller.
• D. Only if a separate panel is developed and there is a plan for installing permanent VCDs.

Answer: (D)

The idea being tested is how ventilation barriers are managed when a new development is being pursued. Temporary stoppings are used to direct airflow during development, but relying on more than two of these next to the last line of cut-throughs can create unstable and uncertain air paths. The way to safely exceed that limit is to show there is a plan for a separate panel to be developed and, crucially, a plan to install permanent ventilation control devices. Having a separate panel and a plan for permanent VCDs ensures there will be a defined, durable and controllable ventilation scheme for the new area, with barriers that can be inspected, tested, and maintained as part of the permanent design rather than ad hoc temporary walls. This provides a stable airflow path from intake to return and aligns with safe ventilation practice and regulatory requirements.