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[Itsdavyjones]

I have been taking earth and space science at school, and there were rock samples, bituminous , lignite, and anthracite, but this game only has bituminous and lignite. What I am proposing is that it gets added (a metamorphic rock) and produces 13 coke when refined, since it is more pure then bituminous coal.

[GreatWyrmGold]

13 coal?!? Seems a bit excessive.
Something like 4-5 coal should be enough to mark it as more pure.

[dizzyelk]

13 coal?!? Seems a bit excessive.
Something like 4-5 coal should be enough to mark it as more pure.

Doesn't bituminous coal produce like 9 coke these days? I'd say 13 would make sense.

[Mr. Palau]

13 coal?!? Seems a bit excessive.
Something like 4-5 coal should be enough to mark it as more pure.

Doesn't bituminous coal produce like 9 coke these days? I'd say 13 would make sense.

How much does lignite produce? Just subtract coke produced from bituminous by coke produced from lignite, add that figure to amount of coke made by refining bituminous coal, then we have a nice and even 3-tier coal system.

[GreatWyrmGold]

13 coal?!? Seems a bit excessive.
Something like 4-5 coal should be enough to mark it as more pure.

Doesn't bituminous coal produce like 9 coke these days? I'd say 13 would make sense.

Maybe. I don't use coal that much...maybe I should...but I don't...
Well, if bituminous makes 9, 13 would be perfect for anthracite. That's +4 fuel/level in a neat leveled system of coal.

[Rakushun]

I haven't found any coal of any kind for many, many versions. Ever since ore was made more scarce, I think.

[King Mir]

Lignite produces 5 coke. It nets 4, so that each mined square averages 1 coke produced. Bituminous coal is 9, or 2 per mined square. 3 per mined square would be 13, like suggested.

The maximum purity is 16, since 17 coke units are larger than a mined stone by volume.

[Mrhappyface]

This would be pretty neat.

[Itsdavyjones]

The maximum purity is 16, since 17 coke units are larger than a mined stone by volume.

From Wikipedia

Graphite may be considered the highest grade of coal, just above anthracite and alternatively called meta-anthracite, although it is not normally used as fuel because it is difficult to ignite.

So it may be possible to use graphite to produce coke, therefor hitting max purity.

[MarcAFK]

I've used graphite for coke on some maps, when i was desperate for fuel.

[Ubiq]

There's also sub-bituminous coal; bituminous coal could be bumped up to thirteen coke with sub-bituminous put at nine with anthracite at sixteen.

[GreatWyrmGold]

I've used graphite for coke on some maps, when i was desperate for fuel.

...Graphite is useable as coal?
In DF, I mean.

There's also sub-bituminous coal; bituminous coal could be bumped up to thirteen coke with sub-bituminous put at nine with anthracite at sixteen.

Where would that leave lignite? And possibly graphite?

[Ubiq]

Where would that leave lignite? And possibly graphite?

Sub-bituminous is lignite that is in the process of turning into bituminous coal... more or less. So lignite could stay at five.

Graphite is the highest grade of coal and is slightly above anthracite, but is really hard to ignite so it isn't as commonly used. There's no reason why both couldn't yield sixteen coke though; graphite being in small clusters means that two or three deposits are going to yield about as much coke as an entire vein of anthracite.

[King Mir]

So long as you're adding other sources of fuel, you may as well add shale.

[Itsdavyjones]

So long as you're adding other sources of fuel, you may as well add shale.

I presume you are referring to oil shale and bituminous shale, and I did a quick Wikipedia search, and both of them could be used as fuel, with bituminous shale being a low grade and oil shale being better, but I would still presume that standard coal would be better then the shales. And maybe we could add oil since we are talking of oil shale now.