A few people, ok quite a lot of people, have reported that the 'Mines nearby' feature (as shown on each mine home page) wasn't working correctly.
And indeed it wasn't, but it's fixed now.
It's only spot on where mines have a full and correct 6 figure national grid reference entered, so any odd results will probably be as a result of a missing or 4 figure NGR, but this only applies to a small number of mines.
Also, don't know if this feature was mentioned before, but if you click the 'pushpin' marking a mine's location on the Google map you'll get a bit of summary information about the mine.
my orders are to sit here and watch the world go by