“One follow-up question, though…If the mine is abandoned, do the property and / or mineral rights revert to whomever manages the land, such as a private holding corporation or public entity, such as a Federal State agency or Native American government?”
As far as I know, yes. Most of the mines I visit are on public lands, owned by the federal government and usually managed by BLM (Bureau of Land Management). In these places the mineral rights would revert back to the government.
I’m no expert on this stuff, and it’s all very complicated. And there are different types of mineral rights:
"The minerals on Federal lands are divided into three categories, each subject to different laws and regulations.
- Locatable, which are subject to the Mining Law of 1872, as amended, include gold, silver, copper and other hard rock minerals.
- Leasable minerals, such as coal and a host of other commodities, are subject to various Mineral Leasing Acts.
- Saleable minerals, such as sand and gravel that are essential to construction and road building, are subject to the Materials Act of 1947, as amended."
Here’s a site with some basic info about mining claims:
https://www.blm.gov/programs/energy-and-minerals/mining-and-minerals/locatable-minerals/mining-claims