I found a great digital book online, "Design of Mine Structures", from 1912:
[url]https://archive.org/details/designminestruc02ketcgoog[/url]
A really great reference resource, it has plans and information about various headframes, ore cars, skips, hoist houses, ore bins, coal tipples, etc.
I wish I'd seen this sooner, it would have been very helpful with the headframe I'm currently working on!