PREHISTORY AT PARYS MINE By Dr David Jenkins
Among the interesting features currently accessible in Parys Mine are the prehistoric sections. Indeed, this was the justification presented to, and agreed by, the Marquess of Anglesey in 1995 in giving permission for underground access to be regained to a mine that had seen around 100 shafts and adits sealed in 1980 for insurance reasons.
The 18th century miners had been aware of earlier activity and for example “Roman workings” are indicated on John Reynolds’ map of 1764.
Oliver Davies excavated old spoil tips in the 1930s and recorded hammer stones and charcoal, used in firesetting, ascribing them to the “Celtic/Roman period” though he did not then have the means to obtain a date from this evidence. Positive proof for the prehistoric origins of the mine had only been obtained in 1988 by dating the charcoal in the rediscovered surface spoil from Davies’s dig.
This had indicated an age corresponding with the Early Bronze Age, making Mynydd Parys, comparable to other prehistoric mine sites in Wales, principally those of the Great Orme and Cwmystwyth.
However, whilst it seems likely that the Romans would have exploited known deposits of copper, a thousand years later, only circumstantial evidence exists for any mining activity on the mountain a thousand years later, in the form of engraved copper ingots discovered there in the 19th century. No direct evidence has yet been revealed, nor indeed at the other Bronze Age sites in Wales
The logic for further research was that the possibility of finding more evidence on the surface of Mynydd Parys was unlikely, given the scale of disturbance in the 18th-19th centuries.
What seemed more promising was to get into the underground workings and explore back up towards the surface.
This argument was spurred on by the embarrassing existence of an alien rounded stone, brought out of the underground mine in the innocent 1970s and used as a convenient doorstop for over a decade. In the 1990s this was recognised as a diagnostic bronze aged stone hammer or maul.
All this led to the hire of Mostyn Rowlands and his JCB in 1995 and to a sunny day spent digging ever deeper on the site vaguely remembered from the 1970s as the entrance to Parys mine.
It was a relief when eventually a shuttered archway blocked by concrete appeared, and even more so when it proved possible to excavate a small body-tight opening above the concrete revealing space beyond.
We had thought that, maybe, after perhaps a year or so of careful exploration, evidence of prehistoric mining might be found. In fact it took only about half an hour!
The main site is at the NW end of the 16fm level. Here a large work chamber had been driven upwards and had intersected the bottom of an earlier working, no doubt to the frustration of the 18th century miners.
The working was in filled with cemented spoil that now forms the excavated west wall and roof of the present chamber. Of particular interest within the sloping bands of spoil is a roughly horizontal bed of banded clay some 30cm thick.
This was presumably formed by slow deposition in a temporary pond during a quiescent phase between two periods of active mining. It is visibly rich in charcoal and preserved organic debris including fragments of oak and birch wood, acorns, oak leaves, bracken fronds, spores and enigmatic fibrous material (hemp/nettles?). The wood provided material for 14C dating confirming an Early Bonze Age date (3540±40 yrs BP) and it is planned to date further samples from different beds to see if there is an age difference from bottom to top, an indication of how long the mining lasted.
The deposit also provides valuable information as to the surface environment at this time – obviously less acidic if dominated by oak and bracken in contrast to today’s bleaker landscape.
Successive sections have now been cut back in these deposits, cleaned, photographed and described, and a large amount of coarser organic debris recovered by washing that will go for identification at Coventry University.
In addition, a vertical column has been excised from the clay ponding deposits for analysis of the pollen content to provide a more detailed reconstruction of the surface vegetation. It may also be possible to match the results against a full dated pollen spectrum being produced for the nearby bog at Rhosybol that might further confirm the date of mining as well as revealing its impact on the local vegetation.
Other prehistoric deposits have been located nearby in the same work chamber including a small chamber with mauls and plant debris in the spoil, yet to be investigated in detail.
A small window in the roof of the passage also yielded wood fragments which gave a second similar date (3420±70 yrs BP) together with a small branch showing as yet unexplained, small (<1cm), ellipsoidal depressions.
These sites all cluster around what appears to be a large infilled shaft
Another promising section has also been located at the top of the Grand Stope (20fm N) which is to be examined and sampled.
Hopefully it may be possible to gain access to open passages above these Bronze Age deposits that could yield much more information on Bronze Age mining.
One such site has already been located and dated to the West of Quarry Stope (16fm W) where 18th-19th Century workings similarly broke up into an earlier descending passage some 2m in diameter.
Ponded deposits had again formed at the bottom of this passage, and these contained wood which has been dated to 3600±70 yrs BP (Figure 2). The passage leads up at steep angle for some 10m before becoming blocked with spoil, and is perhaps similar in nature to those described by O’Brien from the Bronze Age mines (3400-3000yrs BP) at Mount Gabriel in southern Ireland.
There is much work to do in locating and investigating further sites and analysing samples to work out the methods and sequence of mining and reconstructing the Bronze Age environment.
Enticing but currently inaccessible openings exist above the Brown Pool, (16fm NW) and the upper levels of Mona mine have yet to be re-entered and their prehistoric potential explored With luck, artefacts that can survive the acidic environment may be found, such as pot fragments (although these are notably absent at other Bronze Age mines) and organic matter – the bones of a buried miner would be lost but his skin would survive!
But we are fortunate in that what has already been found has elevated the mines on Mynydd Parys to an international archaeological status enjoyed by only a handful of mines in the UK, and these mostly in Wales.
PREHISTORY AT PARYS MINE By Dr David Jenkins