People   (Re-unions, trace old friends and relatives.)

What a fascinating mystery the 1831 burials are!
My two penn'orth is that I would guess at a one-off disaster, such as a pit accident, being responsible for most of them. Being all on the same day doesn't seem to support the view of some kind of epidemic.
It also seems that most of the burials are of people of an age that could have been working in the mines, even as young as 10, and none (out of the whole 28) are of babies or infants, which is unusual if you compare with any other group of this number of burials from other dates.
Has anyone tried asking on other forums, maybe history or genealogy ones, to see if there any suggestions?
I know that searching the usual coal mining history sources produces nothing around this time and place. Maybe it wasn't mining, but some other activity such as a quarry explosion or rockfall? What about newspapers of the time? Before the Observer, but were there any others around?