According to Aurojyoti Bose, lead analyst at GlobalData, the involvement in the $2.2 billion Alcoa-Alumina M&A deal helped these two firms top the chart by value.
State-owned Zesco stated that it is seeking to import power to avert an energy deficit that could affect output in Africa's second-largest copper producer.
Trains carrying loads of coal bring with them higher rates of asthma, heart disease, hospitalization and death for residents living nearest the rail lines.