Before independence, India was subjugated by the British. This is an example sentence using subjugate.
CALL US NOW: +45 96 90 96 90. Home | Mining | Copper ores. The main copper sulphide minerals are chalcopyrite (CuFeS2) chalcocite (Cu2S), covellite (CuS), bornite (Cu5FeS4), tetrahedrite ((Cu,Fe)12Sb4S13) and enargite (Cu3AsS4). The largest source of copper is from porphyry ore deposits in which one or a combination of the aforementioned minerals occurs. A typical copper sulphide ore contains various levels of iron sulphide types that generally include pyrite (FeS2) and pyrrhotite (Fe1-xS).
The physical properties of copper include a density of 8.933 grams per cubic centimeter and a boiling point of 4,644 degrees Fahrenheit. Its atomic weight is 63.546 grams per mole. People were aware of copper as far back as 11,000 years ago, and its extraction from ores dates back about 7,000 years. In nature, the ores cuprite, malachite and bornite contain copper. Copper is commonly used in electrical wires, coins, pipes and jewelry.