- A mine produces minerals
- A source of something emits / produces / generates / provides that something
- Therefore, a mine is a source of minerals

- A mine is a source of minerals
- Mining is when humans take rocks and minerals from the ground
- Therefore, if a mine is a source of something then that something can be mined

- If a mine is a source of something then that something can be mined
- A coal mine is a kind of mine
- Hence, if a coal mine is a source of something then that something can be mined

- If a coal mine is a source of something then that something can be mined
- A coal mine is a source of coal under the ground
- So, coal can be mined from under the ground

- Coal can be mined from under the ground
- The ground is part of the earth
- So, coal can be mined from the earth

- Fossil fuel is a kind of fuel
- Coal is a kind of fossil fuel
- Therefore, coal is a kind of fuel

- Coal is a kind of fuel
- Fuel is a kind of energy source
- Therefore, coal is a kind of energy source

- Coal can be mined from the earth
- Coal is a kind of energy source
- So, coal can be mined from the earth and used as an energy source

Therefore, coal can be mined from the earth and used as an energy source
Question: Which of these can be mined from Earth and used as an energy source?
Context: - Fossil fuel is a kind of fuel 
- A mine produces minerals 
- Mining is when humans take rocks and minerals from the ground 
- A source of something emits / produces / generates / provides that something 
- The ground is part of the earth 
- Coal is a kind of fossil fuel 
- Fuel is a kind of energy source 
- A coal mine is a source of coal under the ground 
- A coal mine is a kind of mine