Ghana says the Spanish company in charge of a lorry that last month exploded and killed 13 people violated storage and transport laws.
Maxam Corp has been fined $6m (£4.4m).
The truck was transporting explosives owned by Maxam to a gold mine when it collided with a motorbike and blew up close to the town of Bogoso.
The blast destroyed the village of Apiatse, injuring more than 100 people.
The firm denies responsibility, blaming a local contractor.
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