I have no recollection of numbered tally systems at any of the Cornish mines in the 1970s - you clocked in, collected a lamp and went to the shaft, but I stand to be corrected on that.
at Mountfield in the mid-80s, you rang the lamp-room to tell them you were entering the drift, and again when you came out. Again, no tallies.
I do have a tally on my keyring to this day, a stamped brass one marked CTW203 which is my tally from the London Bridge Station section of the Jubilee Line Extension in the mid-90s. Tags were recycled as people left, but later in the job the number sequence was just left to run down as people left
I didn't have a tag at Combe Down, although I did have a number; there was a big tally board with names and magnetic markers, you moved it across when you went down the shaft. You would ring across from the Byfields entrance and the banksman would do it. I had a numbered lamp and respirator, and the Mine Manager would check every day that all lamps were back in at the end of the day ( there was no nightshift work )
''the stopes soared beyond the range of our caplamps' - David Bick...... How times change .... oh, I don't know, I've still got a lamp like that.