Podcast
Questions and Answers
What is the primary reason for siting a shaft away from the orebody?
What is the primary reason for siting a shaft away from the orebody?
- To minimize the risk of shaft damage due to mining-induced stresses (correct)
- To ensure easier access to the deposit during the initial mining phase
- To allow for concurrent mining and shaft sinking operations
- To reduce the transportation costs for men, materials, and rock over the mine's life
What is the potential issue with leaving a shaft pillar?
What is the potential issue with leaving a shaft pillar?
- It can become uneconomic, especially at great depths (correct)
- It may require concurrent mining and shaft sinking operations
- It can lead to long transport distances for personnel and materials
- It may become unstable due to increased mining depths
According to Wilson and More O'Ferrall (1970), at what point does shaft damage begin?
According to Wilson and More O'Ferrall (1970), at what point does shaft damage begin?
- When the field stress equals the UCS of the surrounding rock
- When the field stress exceeds half of the UCS of the surrounding rock
- When the field stress exceeds two-thirds of the UCS of the surrounding rock
- When the field stress exceeds a quarter of the UCS of the surrounding rock (correct)
Based on Salamon's (1974) conclusion, at what point is it impractical to keep excavations open?
Based on Salamon's (1974) conclusion, at what point is it impractical to keep excavations open?
Which of the following is NOT mentioned as a method to protect a shaft from subsequent damaging effects induced by mining in a tabular orebody?
Which of the following is NOT mentioned as a method to protect a shaft from subsequent damaging effects induced by mining in a tabular orebody?
What is the exception where the hangingwall is considered more competent than the footwall strata?
What is the exception where the hangingwall is considered more competent than the footwall strata?
What is the main criterion to consider for deep shaft pillar design, according to the text?
What is the main criterion to consider for deep shaft pillar design, according to the text?
According to Wilson and More O'Ferrall (1970), at what point does damage to the shaft become extensive and remedial actions very costly?
According to Wilson and More O'Ferrall (1970), at what point does damage to the shaft become extensive and remedial actions very costly?
What is the potential issue with leaving a shaft pillar, according to the text?
What is the potential issue with leaving a shaft pillar, according to the text?
Which of the following statements is true, based on the information provided in the text?
Which of the following statements is true, based on the information provided in the text?
