MINING SITES IN WALES 343 



that though lead is the predominant metal in the mineralised area of 

 Plyhlimon, the most ancient mines, marked by stone hammers, exist at 

 occurrences of copper-ore. 



(d) Fairly light and crumbly ferruginous slag, found with a small piece 

 of metallic lead, Newtown mine (Montgomeryshire). Contains 53-22% 

 iron, 4-2 % zinc, no lead, arsenic, antimony or copper. 



(e) Galena and pyrites disseminated in quartz, Newtown. Contains 

 12 -08 % lead, 7-89 % iron, 2-3 % copper, no silver, bismuth or zinc. 

 This mine was examined in 1937, and it is hoped shortly to publish a report 

 in the Montgomeryshire Collections. 



(f)-{k) Specimens from Dinorben hill-fort, supplied by Dr. Willoughby 

 Gardner. 



(/) 1 1 34, copper bun-ingot, yellow and very malleable ; metallic, with a 

 little malachite on the surface. Contains 96-72 % copper, very slight 

 traces of lead and tin, no antimony, arsenic, silver, iron, zinc, bismuth, nickel 

 or cobalt. 



(g) 133 1 1 iron slag, black, friable and full of gas-holes, resembling a 

 smithy-slag. Contains 57-61% iron and no copper. 



(h) 1 3 16, black iron slag with some gas-holes. Contains 52-66 % 

 iron, traces of copper. 



(i) 584, whitish-grey material of amorphous structure, containing i -02 % 

 lead, 0-93 % tin, no silver, much insoluble material. Probably earth which 

 has been in contact with one of the numerous tin-lead alloys of Roman 

 date. 



0) ii57i ferruginous material, with almost no insoluble residue. Con- 

 tains 79-21 % iron and no copper. Probably rusted iron. 



(k) Hard and well-fused slag, from the surface. Contains 52-9 % iron, 

 no lead or copper. 



(/) Heavy black slag, Talargoch, a mine believed to be Roman. The 

 slag is crystalline in structure and without gas-holes, owing to slow cooling. 

 It contains 40-4 % iron, 0-24 % lead, 2 - 14 % zinc, no copper. 



DERBYSHIRE CAVES. 



Sixteenth Interim Report of the Committee appointed to co-operate with a 

 Committee of the Royal Anthropological Institute in the exploration of 

 Caves in the Derbyshire District (Mr. M. C. Burkitt, Chairman ; 

 Mr. A. Leslie Armstrong, Secretary ; Prof. H. J. Fleure, F.R.S., 

 Miss D. A. E. Garrod, Dr. J. Wilfred Jackson, Prof. L. S. Palmer, 

 Mr. H. J. E. Peake). 



Creswell Crags. — Mr. Leslie Armstrong, F.S.A., reports as follows : 



The Yew Tree Shelter. — Excavations were continued on this site during 

 the early autumn of 1937 and yielded further evidence of occupation 

 contemporary with that of the Lower Middle and Middle zones of Mother 

 Grundy's Parlour and proved this to be the principal period of its occupa- 

 tion during late Palaeolithic times. 



' A scatter of microlithic flakes and implements on the top of the deposit 

 indicates casual occupation, comparable with that of the final occupation 

 of Mother Grundy's Parlour, of Azilio-Tardenoisian facies. 



