When should boreholes be started near abandoned workings?

The correct approach to starting boreholes near abandoned workings is to do so when within 50 feet, as certified by a competent engineer. This is important because the proximity to abandoned workings can pose significant safety risks. A competent engineer's certification ensures that the assessment takes into account the geological conditions, the integrity of the close vicinity, and the potential hazards that may be present due to the abandoned workings. This cautious approach is designed to protect workers and the integrity of the project by ensuring that any unforeseen issues related to the abandoned site are properly evaluated and managed before commencing drilling activities. This careful consideration is a critical aspect of maintaining safety standards in mining operations.