Question:
The method of stoping NOT suitable if the ore body is subjected to Spontaneous heating is
The method of stoping NOT suitable if the ore body is subjected to Spontaneous heating is
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The key feature of Shrinkage Stoping is using the broken ore itself as a stockpile and working platform inside the mine.
Anytime you have large amounts of broken, reactive material sitting for a long time with air access, you have a risk of spontaneous combustion.
Anytime you have large amounts of broken, reactive material sitting for a long time with air access, you have a risk of spontaneous combustion.
Updated On: Jul 2, 2026
- Sub level Caving
- Cut and fill method
- Shrinkage Stoping
- Room and Pillar method
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
We need to identify which mining method is unsafe to use in an orebody that is prone to spontaneous heating (self-ignition when exposed to air).
Step 2: Detailed Explanation:
Spontaneous heating is a major hazard, especially in sulphide ore bodies and some types of coal.
It requires a large surface area of broken material, a supply of oxygen (air), and sufficient time for the slow oxidation reaction to build up heat to the point of ignition.
A suitable mining method must prevent these conditions.
Let's analyze the methods:
-
Sub level Caving, Cut and fill, Room and Pillar: In these methods, the broken ore is removed relatively quickly from the working area.
Ventilation can be controlled, and there is less long-term storage of broken ore in the stope.
-
Shrinkage Stoping: This method is unique because it involves breaking the ore and leaving most of it inside the stope to act as a working platform for the miners and to support the stope walls.
The broken ore is only drawn out from the bottom after the entire stope has been mined out.
This means a large volume of broken ore (with a huge surface area) remains in the stope, permeable to air, for a very long period.
This creates the perfect conditions for spontaneous heating to occur and develop into an uncontrollable underground fire.
Therefore, shrinkage stoping is extremely dangerous and unsuitable for ores prone to spontaneous heating.
Step 3: Final Answer:
Shrinkage Stoping is not suitable for an ore body subjected to spontaneous heating.
This corresponds to option (C).
We need to identify which mining method is unsafe to use in an orebody that is prone to spontaneous heating (self-ignition when exposed to air).
Step 2: Detailed Explanation:
Spontaneous heating is a major hazard, especially in sulphide ore bodies and some types of coal.
It requires a large surface area of broken material, a supply of oxygen (air), and sufficient time for the slow oxidation reaction to build up heat to the point of ignition.
A suitable mining method must prevent these conditions.
Let's analyze the methods:
-
Sub level Caving, Cut and fill, Room and Pillar: In these methods, the broken ore is removed relatively quickly from the working area.
Ventilation can be controlled, and there is less long-term storage of broken ore in the stope.
-
Shrinkage Stoping: This method is unique because it involves breaking the ore and leaving most of it inside the stope to act as a working platform for the miners and to support the stope walls.
The broken ore is only drawn out from the bottom after the entire stope has been mined out.
This means a large volume of broken ore (with a huge surface area) remains in the stope, permeable to air, for a very long period.
This creates the perfect conditions for spontaneous heating to occur and develop into an uncontrollable underground fire.
Therefore, shrinkage stoping is extremely dangerous and unsuitable for ores prone to spontaneous heating.
Step 3: Final Answer:
Shrinkage Stoping is not suitable for an ore body subjected to spontaneous heating.
This corresponds to option (C).
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