WorksheetsMining methods
Total questions: 13
Worksheet time: 7mins
Which of the following best describes the process of open-cast mining?
Digging vertical shafts to access deep veins of ore.
Using acids to dissolve minerals from underground deposits.
Stripping away surface material in steps to reach shallow ore deposits.
Extracting ore from horizontal layers using tunnels.
What are the two primary methods described for extracting minerals from the Earth?
Strip mining and shaft mining
Open-cast mining and deep mining
Hydraulic mining and placer mining
Solution mining and underground mining
What is a primary consequence of extracting ore with low purity?
Less energy is required for processing.
Less waste material is generated.
More rock must be mined to obtain the same amount of useful material.
The overall cost of extraction decreases.
Why is aluminum easier to extract from bauxite (aluminum oxide) compared to clay (alumino-silicates)?
Clay is less abundant than bauxite.
The chemical bonds in alumino-silicates are stronger and require more energy to break.
Bauxite contains aluminum in a purer form.
Aluminum is not present in clay.
What is the main challenge associated with removing hard rock overburden, such as granite?
It is more expensive to remove due to its toughness.
It increases the risk of dangerous landslides.
It leads to greater water ingress into the mine.
It requires mining at a gentle gradient, increasing the area used.
Mining through loose rock or material primarily poses which significant risk?
Increased energy consumption for processing.
Dangerous landslides.
Higher levels of chemical pollution.
Difficulty in transporting the extracted ore.
How does water ingress affect the cost and efficiency of mining operations?
It reduces the need for pumping, lowering costs.
It makes the ore easier to extract, increasing efficiency.
It requires more pumping and water treatment, increasing expenses.
It has no significant impact on mining operations.
What is the key disadvantage of underground mining compared to open cast mining?
A higher level of health and safety is required for open cast mining.
A higher level of health and safety is required for underground mining.
There is a high level of habitat destruction for open cast mining.
There is a high level of habitat destruction for underground mining.
What is the key disadvantage of open cast mining compared to underground cast mining?
A higher level of health and safety is required for open cast mining.
A higher level of health and safety is required for underground mining.
There is a high level of habitat destruction for open cast mining.
There is a high level of habitat destruction for underground mining.
What is the key disadvantage of underground mining compared to open cast mining?
A higher level of health and safety is required for open cast mining.
A higher level of health and safety is required for underground mining.
There is a high level of habitat destruction for open cast mining.
There is a high level of habitat destruction for underground mining.
What does the term 'cut off ore grade' refer to in mining?
The grade of waste material surrounding the ore body.
The average grade of all ore in a deposit.
The maximum grade of ore that can be processed profitably.
The minimum grade of ore that can be processed profitably.
Which factor is most likely to cause the cut off ore grade to increase?
An increase in ore deposit size.
An improvement in extraction technology.
A decrease in market price of the metal.
A reduction in energy costs.
Why is determining the cut off ore grade important for mining operations?
It ensures only ore with sufficient value is processed, optimizing profitability.
It helps maximize the amount of waste rock extracted.
It is used to calculate the depth of the mine shaft.
It determines the color of the extracted minerals.
