Sentence examples for ore has been from inspiring English sources

The number of slaves working in the Laurium mines or in the mills processing ore has been estimated at 30,000.

The site has barely been developed — no ore has been excavated.

Little iron-bearing ore has been produced in Italy since 1984.

The ore has been exhausted, but the town has important foundries and a thriving lumber and pulp trade.

The metal content of copper ore has been falling since the mid-1990s as existing mines are depleted.

These people are recorded at Ngwenya, where the mining of iron ore has been dated to about ad 400.

The smelting of sulphidic or sulphidic/oxidic ores has been long done in ancient time to produce metallic copper [21, 22].

Deposits of laterite nickel ore, bauxite (aluminum ore), gold, silver, gypsum, and iron ore have been developed commercially.

Large deposits of medium-grade ore have been found northwest of Lake Baikal, close to the Cheremkhovo coal deposits.

Bricks of 100 percent chromium ore have been largely replaced by bricks composed of mixtures of chromite and added magnesia for greater refractoriness, volume stability, and resistance to spalling.

The metal aluminum was first isolated early in the 19th century, but it was not until a modern electrolytic process based on the use of bauxite ore had been developed that commercial production of aluminum became economically feasible.