At least 19 miners were killed on Wednesday in a mine accident at Zambia's Chambishi copper mine, about 400 kms (250 miles) north of Lusaka, a mine official said. "I can confirm to you that 19 miners are confirmed dead after an accident at our mine," said Ruiyong Xu, manager for administration at the Chinese-owned mine. He said the mine was investigating the cause of the underground accident.