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Maybe around 6 - 7 wood log. Mining the coal do you have the area and do you know where to mine for coal.. if you know that kindly let me know I will start mining there..

This is best if your doing lot of camping. Not for industry use.

Yes, I do have a market close to me where I can buy some coal mined from the Earth. Are you interested in mining? You sure can get some area on lease and you would need a license from the Mining Department to start your activities. I don't know much details but I can connect you with my father who is a mining consultant though.

And regarding camping, wherever I've gone so far, I easily managed to get the dry wood which can be used directly. I haven't came across the use of coal. May be it's common in your area.