LONDON/BEIJING - China's Nanjing Hanrui Cobalt, which sells the metal to a firm approved by the London Metal Exchange, said it was unable to ascertain that its products did not involve the use of child labour in Africa.
Nanjing Hanrui is a supplier to another Chinese company, Yantai Cash, which is on the LME's list of firms whose cobalt meets its quality standards.
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