Kinahan — On Irish Metal Mining. 279 



Rich silver-lead, with silver, was found to the south of the 

 county, at Ballycorus, and lead at Shankhill and Rathmichael, at 

 the vicinity of the junction of the Granyte and Metamorphic 

 rocks. These lodes are worked out, hut other lodes ought to occur 

 elsewhere in the vicinity of the line of junction. 



Gold in small quantities has heen found in the Diluvium of 

 some of the valleys in the Ordovician. 



Beryls have heen found in the neighbourhood of Killiney and 

 Dalkey, in Glencullen, on the Three-Rock Mountain, and at 

 Stillorgan. 



Fermanagh. 



Westward of the valley of the Loughs Erne the rocks are 

 Carboniferous Limestone, capped by Coal Measures ; while east of 

 that valley there are Carboniferous Limestones and Shales over- 

 lying a tract of Silurian rocks (Lower Old Red Sandstone) . The 

 arenaceous Carboniferous rocks to the eastward were mapped by 

 Griffith as Calp, but of late years they have been said to belong 

 to the Loicer Coal Measures. No good proofs, however, in favour 

 of this change of classification seem to be forthcoming, while they 

 are very similar to the Calp rocks north of the Tyrone Coal-field. 



At Lisbellaw, S.E. of Upper Lough Erne, is a small exposure 

 of Ordovicians ; while to the north and north-east of the same lake 

 are portions of the adjoining tracts of Metamorphic rocks, which 

 may be either Cambrians or Ordovicians. 



Except in connexion with the clay-iron-stone in the Coal 

 Measures, this county is absent from Griffith's list ; but since that 

 was published, copper, iron, and molybdenite have been found at 

 Castle Caldwell in the Metamorphic rocks. No mineral lodes 

 have been found in the Carboniferous limestones or in the Silu- 

 rians ; this, however, may be due to the great head of drift, or 

 bog, over those areas. 



During the years 1620 to 1641 extensive mining and milling 

 of iron was in progress, the principal works belonging to Sir 

 J. Dunbar and Sir L. Bleverhasset (Blennerhasset) .In latter 

 years the iron appears to have been also mined and smelted until 

 the forests were exhausted. 



