Podcast
Questions and Answers
What is included in the definition of a mine according to the Mines Act 1952?
What is included in the definition of a mine according to the Mines Act 1952?
- Shafts, bore holes, and accessory crude conditioning plants (correct)
- Only surface mining techniques
- Mining related machinery and tools
- Only conventional mines that extract metals
Which method is NOT classified as a mode of entry when opening up a deposit?
Which method is NOT classified as a mode of entry when opening up a deposit?
- Adit
- Tunneling (correct)
- Incline
- Decline
What is the significance of exploratory drilling in mining?
What is the significance of exploratory drilling in mining?
- It replaces the need for shaft sinking
- It is used exclusively for surface mining
- It helps determine the presence and extent of mineral deposits (correct)
- It is only relevant for oil extraction
Which of the following is a consideration in the organization of shaft sinking?
Which of the following is a consideration in the organization of shaft sinking?
What does the term 'box cut' refer to in mining?
What does the term 'box cut' refer to in mining?
Which of the following coal mining methods is NOT commonly mentioned?
Which of the following coal mining methods is NOT commonly mentioned?
What is the primary focus of the basic concepts in underground mining?
What is the primary focus of the basic concepts in underground mining?
Which of the following is NOT a limitation of surface mining?
Which of the following is NOT a limitation of surface mining?
What does the term 'opencast workings' refer to in the context of mining?
What does the term 'opencast workings' refer to in the context of mining?
Which operation is primarily involved with the removal of overburden in mining?
Which operation is primarily involved with the removal of overburden in mining?
What is the primary purpose of power stations and transformer sub-stations in relation to a mine?
What is the primary purpose of power stations and transformer sub-stations in relation to a mine?
Which of the following activities is NOT typically associated with a mine?
Which of the following activities is NOT typically associated with a mine?
What is the main factor that determines whether surface mining or underground mining will be used?
What is the main factor that determines whether surface mining or underground mining will be used?
Which of the following best describes 'aerial ropeways' in the context of mining?
Which of the following best describes 'aerial ropeways' in the context of mining?
Which of the following includes protective works associated with mining?
Which of the following includes protective works associated with mining?
What type of premises is utilized for depositing refuse from a mine?
What type of premises is utilized for depositing refuse from a mine?
What is a significant disadvantage of decline systems in mining?
What is a significant disadvantage of decline systems in mining?
At what depth do shafts become more economic compared to decline ramp systems?
At what depth do shafts become more economic compared to decline ramp systems?
What is the primary challenge in investigating shallower deposits?
What is the primary challenge in investigating shallower deposits?
Which of the following is an advantage of decline systems?
Which of the following is an advantage of decline systems?
Which factor is NOT considered a basic design parameter for mine entries?
Which factor is NOT considered a basic design parameter for mine entries?
What must declines ensure for the largest piece of equipment used?
What must declines ensure for the largest piece of equipment used?
Why is flexibility important in the design of mine entries?
Why is flexibility important in the design of mine entries?
What is often required in a vertical shaft system that is not a concern in declines?
What is often required in a vertical shaft system that is not a concern in declines?
Which transportation method is easier in decline systems but may take more time?
Which transportation method is easier in decline systems but may take more time?
Which mine entry type requires the highest capital expenditure?
Which mine entry type requires the highest capital expenditure?
What is a potential consequence of not considering all design criteria during the initial phase of mine entry development?
What is a potential consequence of not considering all design criteria during the initial phase of mine entry development?
What is a common type of excavation shape for vertical shafts in mining?
What is a common type of excavation shape for vertical shafts in mining?
What is a challenge associated with transporting large equipment through shafts?
What is a challenge associated with transporting large equipment through shafts?
Which of the following describes an adit in underground mining?
Which of the following describes an adit in underground mining?
What economy factor significantly influences the selection between decline or shaft access?
What economy factor significantly influences the selection between decline or shaft access?
What is a critical aspect of mine entry design to ensure operational effectiveness?
What is a critical aspect of mine entry design to ensure operational effectiveness?
Which factor is NOT a reason for sinking shafts?
Which factor is NOT a reason for sinking shafts?
When is a vertical shaft usually preferred over an inclined shaft?
When is a vertical shaft usually preferred over an inclined shaft?
In which scenario would inclined shafts likely be used?
In which scenario would inclined shafts likely be used?
What is a disadvantage of sinking a vertical shaft in a strong ore body?
What is a disadvantage of sinking a vertical shaft in a strong ore body?
Which of the following is true regarding the depth preference for inclined and vertical shafts?
Which of the following is true regarding the depth preference for inclined and vertical shafts?
Which characteristic is NOT associated with a vertical shaft?
Which characteristic is NOT associated with a vertical shaft?
What operational benefit does shorter drivage length offer in shaft construction?
What operational benefit does shorter drivage length offer in shaft construction?
What factor primarily influences the choice between a vertical and inclined shaft?
What factor primarily influences the choice between a vertical and inclined shaft?
Flashcards are hidden until you start studying
Study Notes
Mine Definition
- A mine is an excavation for searching or obtaining minerals.
- Mine definition includes: boreholes, oil wells, shafts, levels, inclined planes, conveyors, adits, levels, planes, machinery works, railways, tramways, sidings, protective works, workshops, stores, power stations, transformer sub-stations, converter stations, rectifier stations, accumulator storage stations, premises for depositing sand or other material for use in a mine, premises for depositing refuse from a mine or in which any operations in connection with such sand or refuse or other material is being carried on, and premises in or adjacent to and belonging to a mine or which any process ancillary to the getting, dressing or operation for sale of minerals or of coke is being carried on.
Mine Entry Types
- Adits are horizontal or near horizontal openings that provide access for personnel, material, rock, ventilation, and mine drainage. Suitable for flat deposits at shallow depth.
- Shafts are vertical excavations that access the orebody with a size determined by production and ventilation requirements. Typically used when orebodies extend deeper than 250 m to 500 m.
- Inclines are inclined openings that provide a direct connection to the orebody. Similar to shafts, but with a steeper angle of descent.
- Declines are downward sloping openings that provide access to the orebody. Declines are typically used for shallower orebodies.
- Combined mode of entry: This can be a combination of the above.
Choosing Entry Type
- The choice of mine entry depends on:
- Depth of the mineral deposit
- Type of mineral deposit
- Production needs
- Ventilation requirements
Adit Advantages
- Low initial capital cost and operating cost
- Easy transportation of manpower
Adit Disadvantages
- Longer haul distance for deeper deposits
- Trackless mining with high hauling capacity is not possible
- Water handling can be a problem
- Length of cable for power supply is longer
Decline Advantages
- Allows movement of large equipment
- Low cost of development
- Short period to commencing mining operations
Decline Disadvantages
- Increased ventilation requirements due to larger length
- Increased labour to support truck operation
Shaft Advantages
- Support moderately high production rates
- Efficient for transportation of personnel, material, and rock
Shaft Disadvantages
- High initial capital expenditure
- Long lead time to production
- Difficulty in transporting large equipment
Shaft Vs. Incline
- Depth of the deposit is the deciding factor for flat-lying formations.
- Inclines/slopes are usually driven for deposits not exceeding 300-400m.
- Shafts are the usual choice for greater depths.
- Vertical Shafts require cross-cuts to be driven to the ore body.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
