FOREIGN MINING REGIONS. ou 
Marie aux-Mines: argentiferous galenite (affording 1-1000 of silver), 
with pyromorphites, tetrahedrite, antimonial sulphuret of silver, na- 
tive silver, arsenical cobalt, native arsenic, and pyrite, occasionally 
auriferous ; affording silver and lead ; rocks; argillaceous schist, sye- 
nyte, and porphyry. 
20. In France there are also the mining districts of the Alps, Au- 
vergne or the Plateau of Central France, Brittany, and the Pyrenecs, 
but none are very productive, except in irou ores. Brittany resembles 
Cornwall, and formerly yielded some tin and copper. The valley of 
Oisans in the Alps, at Allemont, contains argentiferous galenite, arseni- 
cal cobalt and nickel, gray copper, native mercury, and other ores, in 
talcose, micaceous and syenytic schists, but they are not now explored. 
The region of Central. France is worked at this time only at Pont- 
Gibaud, in the department of Puy-de-Dome, and at Vialas and Ville- 
fort in the Gard. The former is a region of schistose and granite 
rocks, intersected by porphyry, afferding some copper, antimony, lead, 
and silver ; the latter of gneiss, affording lead and silver, from argcn- 
tiferous galena. The French Pyrenees are worked at the present time 
only for iron. 
21. In England there are two great metalliferous districts : 
A. On the southwest, in Cornwall, and the adjoining county of De- 
vonshire : pyritous copper and various other copper ores, tin cres, 
galenite, with some bismuth, cobalt, nickel and antimeny ores ; afiord- 
ing principally copper, tin, and lead ; rocks : granite, gneiss, micaceous 
and argillaceous schist, elvanyte. 
B. On the north, in Cumberland, the adjoining parts of Durham, 
with Yorkshire and Derbyshire, just south: galenite, end other lecd 
ores, blende, copper ores, calamine and smithscnite (the zine cres es- 
pecially at Alstonmoor in Cumberland, and Castleton and Matlock, in 
Derbyshire), affording some zinc, and three-fifths of the lead cf Great 
Britain, and some copper ; rock: Carboniferous limestone. 
C. There is also a vein of calamine, blende, and galenite, in the 
same limestone at Holywell, in Flintshire, on the north of Wales ; 
another of calamine at Mendip Hills, in Southern England, south of 
the Bristol Channel, in Somersetshire, cecurring in magnesian lime- 
stone ; mines of copper on the Isle of Anglesey, in North Wales, in 
Westmoreland and the adjacent parts of Cumberland and Lancashire, 
in the southwest of Scotland, the Isle of Man, and at Ecton in Staficrd- 
shire, &c. 
22. In Spain there are mines— 
A. On the south, in the mountains near the Mediterranean coast, 
in New Grenada, and east to Carthagena, in Murcia; also in New 
Grenada, in the Sierra Nevada, or the mountains of Alpujarras, the 
Sierra Almagrera, the Sierra de Gador, just back of Almeria, and at 
Almazarron near Carthagena: galenite, which is argentiferous at the 
Sierra Almagrera and at Almazarron, affording full 1 per cent. of 
silver ; rock: limestone, associated with schist and crystalline rocks. 
B. The vicinity of the range of mountains running westward from 
Alearaz (to the district of La Mancha), to Portugal. 1. On the scuth, 
near the centre of the province of Jaen, at Linares, latitude 88° 5’, 
longitude 3° 40’: galenite, cerussite, cuprite, malachite, in granite and 
schists ; affording lead and copper. 2. In La Mancha, at Alcaraz, 
northeast of Linares, latitude 38° 45’: calamine affording abundantly 
