Tech firms to check suppliers after mining revelations in Tanzania

Apple says it is 'deeply committed to responsible sourcing of materials'

Electronics companies, including Canon, Apple and Nokia, are re-evaluating their supply chains following reports they may be using gold extracted from a Tanzanian mine that has been criticised for environmental failures.

Over the past 10 years, at the North Mara goldmine - which is operated by London-listed Acacia Mining - there have been more than a dozen killings of intruding locals by security personnel.