The seams are principally above water levels and in many cases have been laid bare by erosion; and the supply is varied - besides a " fat coking, gassy bituminous," there are an excellent grade of splint coal (first mined in 1864 at Coalburg, Kanawha county) and (except that in Kentucky) the only important supply of cannel coal in the United States.
The Flemish coal-basin, employing over 100,000 hands, produces 60% of the coal mined in France.
Copper is known to exist in all the states, and has been mined extensively in South Australia, New South Wales, Queensland and.
Gothite occurs with other iron oxides, especially limonite and hematite, and when found in sufficient quantity is mined with these as an ore of iron.
Iron is mainly mined in Elba.
As quarried or mined free sulphur is always contaminated with limestone, gypsum, clay, &c.; the principle underlying its extraction from these impurities is one of simple liquation, i.e.
Gold has been mined in the Urals since 1820; but since 1892 the output has fallen off very considerably.
Salt has been mined there since the 16th century.
Portion of the Mountain Region; and that mica was mined here before any European settlement of the country seems proved by numerous excavations and by huge heaps on which are large oak and chestnut trees, some fallen and decayed.
Silver is not mined by itself, but is found in combination with gold.
Manganese ore is mined for export, and bismuth is reported to have been discovered.
Florida is also the principal source in the United States for fuller's earth, a deposit of which, near Quincy, was first discovered in 1893 and clay (including kaolin) is also mined to some extent.
They are important ores of silver (the pure chloride contains 75.3% of silver), and have been extensively mined at several places in Chile, also in Mexico, and at Broken Hill in New South Wales.
When these first four galleries were full others were mined on the same level at right angles to them, thus gradually converting the whole area into a net-work of corridors.
The iron ores mined at Daiquiri near Santiago are mainly rich hematites running above 60% of iron, with very little sulphur or phosphorus admixture.
Manganese is mined mainly near La Maya and El Cristo in Oriente.
Peary and Astrup, as already indicated, crossed in 1892 the northern part of the inland ice between 78° and 82° N., o reaching a height of about 8000 ft., and deter mined the northern termination of the icecovering.
The quality of ore in the two ranges differs somewhat, that mined from the Vermilion Range being a hard specular or red haematite, while that taken from the Mesabi Range, largely red haematite, is much softer and in many localities quite finely comminuted.
Copper is mined and extensive deposits of petroleum and asphalt are being exploited.
The mica mined in India is practically all muscovite.
Anglesite, or lead sulphate, PbSO 4, is poor in silver, and is only exceptionally mined by itself; it occurs in quantity in France, Spain, Sardinia and Australia.
Manganese is mined in Minas Geraes for export.
Bituminous coal of an inferior quality is mined to a limited extent in Rio Grande do Sul, and another mine has been opened in Santa Catharina.
It is the shipping place for the iron ore mined at Gellivara, 127 m.
Several floors can be mined simultaneously, the work in the lower floors being kept well in advance.
No, the bridge has not yet been taken and I hope it will not be, for it is mined and orders have been given to blow it up.
(Observe that all three are Gascons.) 'Gentlemen,' says one of them, 'you know the Thabor Bridge is mined and doubly mined and that there are menacing fortifications at its head and an army of fifteen thousand men has been ordered to blow up the bridge and not let us cross?