iron ore

Iron ores were much more widespread than either copper or tin.

The municipality is rich on iron ores, and water to produce power.

In that period the exploiting of iron ores began.

The region is rich in magnetic iron ores, which were mined for many years.

It is also found in phosphate bearing iron ores.

The iron ores in those mountains will liquify and form a molten crust.

Fe3O4 is magnetite, one of the major iron ores found in the earth's crust.

At that time large quantities of charcoal were needed for the smelting of iron ores.

A weak magnetic field attracts magnetite, then haematite and other iron ores.

Iron ores mined from the area are of the hematite and magnetite variety.

Iron ores were a local product of the Valley of Oaxaca.

Most important, it releases oxygen from the iron ore, which makes up a high percentage of common iron ores.

The manganese and iron ores of the Urals were linked to great coalfields 1,250 miles further east.

Iron ores were crushed and placed in furnaces layered with the right proportion of hardwood.

Iron-rich sedimentary rocks have economic uses as iron ores.

Most of the iron ores are concentrated around the Bellary-Hospet region.

It is associated with iron ores.

Later on, iron ores brought about a gradual switch from copper to iron mining.

As the local iron ores were being exhausted and the works used larger quantities, these local supplies were not enough.

Iron ores are rocks and minerals from which metallic iron can be economically extracted.

Iron ores consist of oxygen and iron atoms bonded together into molecules.

Gold, silver and iron ores were mined in surroundings of Bruntal.

Since the 13th and 14th century, the area acquired economical importance as a source of iron ores.

This involved the catalytic reforming of natural gas to effect the direct reduction of iron ores.

Deposits of that anomalous form of silicon were bound up in the iron ores at this depth.