Hey d-k! Thanks for running that adventure at GenX! I hope I can help return the favor, sort of.
1) Remember that very few mines are actually linear...the miners follow the veins of whatever they're seeking wherever they lead. As a result, many old mines have internal structures that look like anthills or termite mounds. However, some materials are strip mined, resulting in big pits.
Some materials are simply hazardous to mine- toxic to breathe, radioactive, etc.
Some materials, like salt, are mined in a combo of the above, resulting in huge excavated chambers.
Other materials may be mined by persons actually living on site. Coober Peady is a semi-famous opal mine in Australia- many of the miners have living quarters below ground...they excavated a space searching for opals and then moved in. Want an additional room? That add-on might just pay for itself with further finds!
Determine the kind of material the miners were after and your mines will start to take on a shape.
2) Important RW hazards of mines: flooding, cave-ins, and gas (flammable and/or poisonous).
3) Fantasy caves have a much richer ecosystem than do RW caves, especially with the huge number of oversized burrowing insects, Umber Hulks, Bulettes and so forth.
Y'know...there's no reason to think that Bulettes feed exclusively at the surface.
1) Remember that very few mines are actually linear...the miners follow the veins of whatever they're seeking wherever they lead. As a result, many old mines have internal structures that look like anthills or termite mounds. However, some materials are strip mined, resulting in big pits.
Some materials are simply hazardous to mine- toxic to breathe, radioactive, etc.
Some materials, like salt, are mined in a combo of the above, resulting in huge excavated chambers.
Other materials may be mined by persons actually living on site. Coober Peady is a semi-famous opal mine in Australia- many of the miners have living quarters below ground...they excavated a space searching for opals and then moved in. Want an additional room? That add-on might just pay for itself with further finds!
Determine the kind of material the miners were after and your mines will start to take on a shape.
2) Important RW hazards of mines: flooding, cave-ins, and gas (flammable and/or poisonous).
3) Fantasy caves have a much richer ecosystem than do RW caves, especially with the huge number of oversized burrowing insects, Umber Hulks, Bulettes and so forth.
Y'know...there's no reason to think that Bulettes feed exclusively at the surface.