What is the most dangerous area in all types of surface mines?

What is the most dangerous area in all types of surface mines?

• A. Highwalls
• B. Stoppings
• C. Roadways
• D. Working faces

Answer: (A)

Highwalls—the exposed rock faces left after mining—are the most dangerous area in surface mines. They can fail suddenly because the rock is fractured, weathered, and undercut by blasting and removal of support material. Gravity-driven rockfalls, block avalanches, or slope collapses can unleash large amounts of rock onto benches, haul roads, and personnel or equipment below, often with little to no warning. The danger is amplified by weathering, seepage, and joints or faults in the rock, which can create unstable zones that give way unexpectedly. Mitigation focuses on monitoring for instability, removing loose rock (scaling), maintaining proper bench angles, controlling drainage, and restricting access to danger zones to reduce the chance of a highwall collapse harming workers.

Highwalls—the exposed rock faces left after mining—are the most dangerous area in surface mines. They can fail suddenly because the rock is fractured, weathered, and undercut by blasting and removal of support material. Gravity-driven rockfalls, block avalanches, or slope collapses can unleash large amounts of rock onto benches, haul roads, and personnel or equipment below, often with little to no warning. The danger is amplified by weathering, seepage, and joints or faults in the rock, which can create unstable zones that give way unexpectedly. Mitigation focuses on monitoring for instability, removing loose rock (scaling), maintaining proper bench angles, controlling drainage, and restricting access to danger zones to reduce the chance of a highwall collapse harming workers.