Newsletter 17, Page 2

COPPER IN THE LIZARD

by Dr A.F.Seager

(Another article from ‘The Lizard – the Magazine of The Lizard Field Club’ first published 1957

Why did men come to settle at Kynance Gate during the Middle Bronze Age?  It has been suggested that they came in search of copper. I am not an archaeologist, and would not presume to enter the archaeological lists, but since this question is partly geological I will give some of the geological evidence that we possess, from which the archaeologists may draw their own conclusions.

It is true that metallic copper has been found in the serpentine of the Lizard area. This copper is, however, very widely scattered and usually found only in very small amounts after prolonged searching. Of the localities nearer to Kynance, copper has been found at Holestrow and Pentreath, in or near Lizard Town, at Ruan Major and south-east of Mullion Cove. Further afield copper has been reported from the quarries at Countybridge and Meaver, on Goonhilly Downs and near Traboe, as well as from Coverack and some shafts near Beagle’s Point by Black Head. From this account copper may appear to be plentiful, but this is far from the truth. At most of the localities named there was insufficient copper to warrant an attempt at economic exploitation. Even with the relatively advanced mining, methods and machinery available a century ago no deposit of copper in the Lizard ever yielded a profit. The only serious venture was at the locality near Mullion Cove, which was called Wheal Unity or Ghostcroft. At this mine one piece of copper was raised which measured 7 feet 6 inches in length and weighed about three tons. This specimen is preserved at the museum of the Geological Survey in South

Kensington, in London.

In the rest of Cornwall outside the Lizard peninsula, copper was a very plentiful metal. As early as the period 1726 to 1735 the annual production of copper was about 6,000 tons, by 1806 it was 79,000 tons and in 1838 it reached the figure of 151,000 tons. At this time copper mining was a highly profitable business. This gives some idea of the relative abundance of copper in the Lizard and elsewhere in Cornwall. In the Lizard, copper is little more than a mineral collector’s curio.

If we assume that the Bronze Age men settled in the Lizard for the purpose of making bronze, as well as pursuing agriculture and keeping animals, where would they obtain the tin which they required to alloy with the copper in order to make bronze? There is certainly no tin in the Lizard area proper, although some has been won in the Meneage. The vast majority of tin which has been obtained in Cornwall has come from streams running off the granite backbone of that great county, or later from mines situated on or near those granites.

If the men of Kynance had to journey to some more distant part of Cornwall for their tin, why should they not also obtain their copper from the same source or some where near it? I wonder if the archaeologists would consider it likely that the inhabitants of Kynance Gate were an agricultural community which bartered its produce for bronze with their brothers elsewhere in Cornwall, who would have had the wood and the ores of copper and tin necessary for the manufacture of bronze.

The Glow-worm Lampyris noctiluca

   Male       Female

Fifty years ago glow-worms were common in the British countryside, so common that in some localities people could read by their light. Now they are rare, probably because of the loss of meadows and grassland. Glow-worms, relatives of tropical fire-flies, take their name from the female which emits the light. During the day the wingless females hide from predators, but at night they crawl on to vegetation so that they can display their light most effectively to attract males. The glow-worm’s light is produced by cells that use oxygen, water and an enzyme to form the light-emitting substance oxyluciferin. The light is enhanced by a layer of reflector cells. In the early evening the glow is yellowy-green but changes to a brighter yellow after dark.

A female emits light at will when she wants to attract males. The light is surprisingly intense for such a small source. The male has excellent sight to spot the female at up to ten yards and wings to reach her. Each compound eye in the male is eight times more powerful than the female’s with 2,500 facets compared with 300. The male pinpoints the female accurately, and when directly above, closes his wings and drops on to her. 

My sister and I walked up Polcoverack Lane late one summer’s evening in the early 1950s collecting glow-worms in a jamjar. We thought they were wonderful. On discovering the hapless creatures in our bedroom mother immediately returned them to their more natural habitat! Nowadays their descendants can still be found in the hedgerows of the Peninsula.

Night Blight

CPRE National Office has suggested amendments to the Planning and Compulsory Purchase Bill, that would bring lighting under full planning control.

Light itself is not classified as development. Regardless of the intrusiveness of a light beam, if a fixture does not significantly alter the appearance of a building and/or it is not a free-standing structure, the light itself cannot be classed as development and is not subject to planning controls nor is it specifically listed as a statutory nuisance. As a result many Local and Environmental Health Officers are reluctant to take action simply because there is so much confusion about whether and how light pollution can be classified as a statutory nuisance. CPRE proposes the introduction of statutory enabling provisions which will make provision for restricting the use of external lighting. It will also provide for enforcement control including prosecution and fines and give powers for the removal of unauthorised lights. The advantages of these new provisions will be that

     - they will provide a self-contained code through regulations for the control of lighting

     - where planning consent is granted it can be made subject to conditions e.g. limiting the hours of operation

there is a precedent for this approach in the regime applicable to advertisements.

CPRE intend to launch their Night Blight campaign in May.

with thanks to the CPRE Planning Review March 2003

The Lizard Lighthouse

Newsletter Page 2

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