>>2306877I dunno about mines but caves have been legally kept off maps since this 1988 federal law was passed in the United States:
Information concerning the specific location of any significant cave may not be made available to the public under section 552 of title 5 unless the Secretary determines that disclosure of such information would further the purposes of this chapter and would not create a substantial risk of harm, theft, or destruction of such cave.
https://en.wikipedia.org/wiki/Federal_Cave_Resources_Protection_Act_of_1988codifies gatekeeping so you have to join up with a caving club and get their social approval before you can find out where the caves are
I've seen plenty of abandoned mines browsing around WV topo maps its marked with sort of like a Y shape so I dunno if that's treated differently.
