It all starts deep underground, where massive machines extract raw ore loaded with copper. But mining is just ... and high-tech refining turn rough rock into one of the world’s most valuable ...

Lewis H. Parrish and R. M. Roberts, have secured a patent in England for improvements in the separation and extraction of copper from its ores. The object sought is the chemical treatment of ...

Copper ore must undergo a complicated refining process to convert it into saleable high-purity copper products, as mined ore typically contains less than 1 percent copper. Copper refining involves ...

Rough diamond production ... at an average of 427c/lb. In Chile, copper production fell 7% to 112 600 t. The ongoing characteristics of lower grade and ore hardness will continue to impact ...

Teck Resources and Sumitomo Metal Mining are locked in a commercial dispute over a major copper supply deal, exposing cracks ...

TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of ...

The company forecast steady iron-ore production for the year ahead, and said it should again produce more copper and less coal. Photo: Philip Gostelow/Bloomberg News ...

BHP BHP0.65%increase; green up pointing triangle Group on Tuesday posted a sharp rise in second-quarter copper production thanks to a jump in output at Escondida, the world’s largest copper mine.

Copper and iron ore rose with most industrial commodities as Federal Reserve Chair Jerome Powell flagged the central bank was on course to cut rates next month, which would be a boost for global ...