A difficult one to answer; because I'm sure what will work for one site won't work for another. Or what will work for one person won't work for another ;)
For now, how about just detailing any previous names and the years the mine was known by that name in the mine description?
Or, if there's an entry for a minor feature, e.g. a drainage adit for a mine with it's own entry - then perhaps an album in the mine for the feature?
Not relevant to this topic, but so you know what's happening with the web site...
Regular site users will have spotted I'm re-writing section by section at the moment, and my word is it a big job....
To date I've done the home page, forum home page, the new database/search page, the photo page, supersize page and I've just about finished the album page, then starting next on the mine pages... The new album page and mine pages should go live around mid-March. I then need to look at making the site mobile and tablet friendly, re-write the registration process, and then re-write the forum.
At that stage I can start re-writing the site management admin tools. At which point I can perhaps look at adding mine to mine linking or multiple records for names and eras.
Taking it section by section it's likely going to take about 18 months to complete.
my orders are to sit here and watch the world go by