Sentence examples for ores which have from inspiring English sources

But Tanzania's economic growth, and government revenues, are heavily dependent on exports of gold and precious metal ores, which have fallen in price in recent months.

The ore deposit of Hüttenberg is famous for its high quality manganiferous ores, which have been mined (according to the current state of research) from the Late Iron Age until 1978, when the last mines were closed.

Deeper ores which had smaller amounts of gold were ignored as the companies couldn't afford to mine them.

These included discoveries related to X-radiation and purification of uranium ores, which had been made by Bachelder during the course of the war effort.

They surmised that the outbreak resulted from artisanal processing of lead-rich gold ores, which had recently expanded in scope and become increasingly mechanized through use of gasoline engine-powered flourmills to grind the ores [ MSF 2012; United Nations Environment Programme/Office for the Coordination of Humanitarian Affairs (UNEP/OCHA) 2010; von Lindern et al. 2011].

In addition to Mr. Yeddyurappa, Mr. Hegde also accused other state leaders and corporations of wrongdoing, including illegally mining iron ore, which has surged in recent years.

Vale has been hit by a decline in the price of steel-making iron ore and write-downs of underperforming mines, as part of a plan to slash costs and refocus new investments on iron ore, which has historically been responsible for nearly 90 percent of the company's profit.

The export of nickel ore, which has been mined since 1875, and of partly refined nickel from a large foundry on the outskirts of Nouméa, is subject to boom-and-bust cycles determined by the needs of the world steel industry and competition from other producers.

A merger of BHP and Rio threatens to create a giant with a huge degree of pricing power, particularly over iron ore, which has raised the hackles of steelmakers.

In 1788 mining ceased at Dolcoath itself, although some bal maidens continued to be employed picking through the large quantities of ore which had already been brought to the surface.

Sahajwalla says large-scale smelters have a high energy cost because they need to extract metal from ore bodies, which have been produced from upstream mining activities.