(1) The mine's reserves of ore

(2) The biggest deposits of the metal ore in the world are to be found in the eastern Congo.

(3) This deposit is the biggest in Bulgaria and in Europe for underground extract of gold-copper ores .

(4) The study of rocks, ores and minerals is an integral part of Geology class in school.

(5) Mercury is now extracted from its ores by a method that has been used for hundreds of years.

(6) Activities such as mining and manufacturing greatly increase the release of heavy metals from rocks and ores .

(7) The mountain massifs to the east of the Rhu00d4u00f6u00a3u00d4u00f6u00f1ne, however, were less rich in metal ores .

(8) Iron, in contrast, combines with elements such as oxygen and sulphur to make mineral ores .

(9) Indium is obtained by extracting it from zinc ores while they are being processed to produce zinc metal.

(10) Specimens of minerals, ores , and gemstones began to be saved for their scientific value and as natural curiosities.

(11) It was also used in the production of metals from their ores .

(12) Microbial mining reactions can, on the other hand, be turned to commercial advantage to extract metals from low-grade ores .

(13) In my view, the commodity boom is a reminder that the supply of ores , minerals and metals is not infinitely flexible.

(14) They live in mountainous regions, and mine ores and metal to craft weapons.

(15) The most important single application of oxygen is in metallurgy where it is used to extract metals from their ores .

(16) In an exhibition of mineral ores those of copper first attract the attention, providing a joy to the eye as do those of no other metal.

(17) Water entrapped by molten metal or slag may generate explosive forces that launch hot metal or material ores over a wide area.

(18) These metals are typically won from polymetallic ores rich in sulfosalts.

(19) Its compounds tend to be found with ores of other metals, such as lead, silver, gold, and cobalt.

(20) Students are taught how to make their own pigments from mineral sources such as ores , soils and carbon black.