Questions tagged [coal]

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7
votes
4answers
224 views

Where did all the CO₂ come from that was deposited as coal during the Carboniferous?

During the Carboniferous, vast deposits of coal (or peat at that time) were created because – as far as I understand – decomposition of wood (white rot?) was not yet "invented" at that time. This ...
1
vote
1answer
30 views

What is the origin of cleating in coal?

Why do some coals show cleating and some not? Is cleating in coal related to coal's plant source or depositional process or post depositional processes?
8
votes
3answers
1k views

What is the most important source of natural gas? Coal, oil or other?

By heat and pressure, both coal and oil can produce gas. But what is the most important substance for gas? Is there a relation to the amounts of marine organism (sea life) which died and the amount of ...
1
vote
1answer
54 views

Coal fires affecting seismic activity, and also volcanoes

Can coal fires cause earthquakes to happen, or possibly prevent or postpone earthquakes? Also can coal fires trigger(or prevent) volcanic eruptions by affecting flow of magma underground or by some ...
1
vote
1answer
229 views

Open Mining facility/operation GIS data

Wondering if there is any GIS data available for mining operations in any places in the world. I looked here but didn't find much: https://catalog.data.gov/dataset?tags=mines https://www.eia.gov/...
0
votes
1answer
80 views

Roughly how much Co2 is generated per kWh of electricity generated [closed]

I’m interested to know how much Co2 is generated by a coal fired power station to produce 1kWh of electricity for electrical grid
8
votes
1answer
169 views

Could diamonds be formed from coal?

Diamonds are predominately formed in cratons and brought to the surface in kimberlite pipes. However, it seems theoretically possible that diamonds could form at either subduction zones or from ...
3
votes
4answers
2k views

Coal self-heating and spontaneous combustion, how does this happen?

I finally broke down and read the Wikipedia article on spontaneous combustion and I was surprised to see how serious of a problem this can be. Wet hay, oily rags, there really are exothermic reactions ...
1
vote
3answers
2k views

Petroleum and coal formation

I was wondering why are coal and petroleum being both fossil fuels are found at different places i.e. coal at land and petroleum at sea.
3
votes
2answers
120 views

Is there a risk with putting out smouldering underground coal reserves? [closed]

According to this Discovery News video about Centralia Pennsylvania and other underground coal fires, there are many smouldering underground coal reserves making the land above it uninhabitable to ...
6
votes
4answers
7k views

Why is coal classified as a sedimentary rock?

Something just clicked in my head today. Rocks, by the definition I was taught, are composed of minerals which in turn are by definition not organic, so they are or were not alive. However. Coal, ...
12
votes
1answer
223 views

How many joules are required to mine a unit of coal?

Coal is still a major source of energy for generation of electricity. So how much energy is used to extract a unit (tonne/kilogram etc) of coal? And thus what is the efficiency of coal as a source of ...