How about this for a possible solution?
It takes into account (hopefully!) the various points made; that surface remains and other locations often do justify having their own album, but that they may 'belong' to more than one mine (or quarry) but that at the same time people often like to see photos grouped together in the same album. Too many albums arguably fragments the site - which is why the 'show all photos for this mine' option is on each mine home page.
1) Where a surface location or feature justifies it's own dedicated album then an admin can easily create an album for that feature / location - and a full description can be entered into the album description.
2) The mine>album multi-link feature be extended, albums can be tagged to more than one mine already, for example you'll find that most of the Croesor / Rhosydd Through Trip albums are tagged to both Croesor and Rhosydd. But this is currently manual; I could add the facility on the 'thank you' page when a new album is created so that when a new album has been created for a given mine/quarry that it offers all the other mines/quarries with 2km (for example) so the new album can be tagged to them as well.
This gives us a situation where a port, or railway (for example) could have an album created and tagged to all mines/quarries it relates to.
3) The image upload facility could have a new drop-down added to it to indicate whether the photo was underground / above ground / etc (we'd need to compile a list). A new filter would then be added to the album page which would allow the display to be refined to only show one type (or all) in much the same way that it can be refined to show by members or just a specific member.
4) The image upload facility could have the same modification at the 'thank you' stage to tag the same photo to any other album in the same mine.
Would that cover it?
I think the idea of a new album for each mine for just 'surface remains' should be avoided since it could fragment the photos too much, and wouldn't really cover the issue of surface remains that applied to more than one mine, being just another album for the mine in question.
my orders are to sit here and watch the world go by