Chap. XXVII.] methods used abroad. .579 
2. Mono da Mina deposit, Quelaz area. Brazil 1. A vertically 
dipping deposit of great thickness, the ore being interbanded 
with clay. Tunnels driven into the hillside at depths up 
to 147 feet below original outcrop. 
3. Ponupo deposits, Santiago de Cuba area, Cuba 2. Irregular 
pockets in clay and associated \vith jasper and porphyry 
at the surface. Some of the ores are washed and concen- 
trated. 
4. Las Cabesses deposits, Ariege, France 3. An irregular carbonate 
deposit, altered to oxide at the surface, associated with 
Upper Devonian limestones. In 1894 a depth of 70 metres 
had been reached, and the deposit was worked by a series 
of 8 levels. The ore was treated by means of sjTinging 
and hand-picking, grizzlies being used to separate the smalls, 
and trommels to classify them. The ores are fnaUy roasted. 
5. Romaniche, Saone et Loire, France 4. Veins, up to 8 metres 
wide, and masses, of psilomelane and pyrolusite, associated 
■with fault-junction between granite and Keuper, Liassic, 
and Tertiary, sediments. Worked by shafts, levels, stopes, 
etc., and gradually passes into iron-ore (hematite) at depths 
of 260—330 feet. 
(). Island of San Pietro, Sardinia ». A seam of manganese-oxide 
ore, averaging 10 inches in thickness, associated with ochres, 
and interbedded with trachytic rocks. Average manganese 
percentage only 30%. Worked by galleries and cross-cuts 
with timbering. 
7. Rhiw Mines, Caernarvonshire, North Wales 6. The workings 
are in veins of ore from 4 to 30 feet thick. Ore averages 
30 to 36% manganese, iron 7 to 10%, silica 18%, phos- 
phorus \ to J%. Worked by adits and shaft ; a depth 
of 110 feet reached. 
1 M. A. Lisboa, Reprint from Brazilian Engineeriiig and Mining Review, III, Nos. 
fc 7. Received 1907. 
2 H. Souder, Trans. Amer. Insi. Min. Eng., XXXV, pp. 309-312, (1904). 
3 C. A. Moreing. Trans. Inst. Min. Met., II, pp. 250-2C4, (1894). 
4 Fuchs & Laiinay, ' Gites Mineraux', II, pp. 13-lG, (1893). 
5 E. HaLse, Trans. Xorlh Eng. Inst. Min. Mech. Eng., XXX1\', pp. 145-158, (1885). 
6 Mining Journal, June 22nd, 1907, p. 828. 
