Pike River Coal's second shipment of around 20,000 tonnes of coal will leave from Port Lyttelton for India on Monday.
The consignment is worth around $6 million.
The shipment was delayed by a day, due to the earthquake on Saturday.
Pike River chief executive Gordon Ward says tremors were felt across the West Coast, but there was no impact on its mine or facilities.
He says miners working underground at the time of the quake were unaware of the event.
The Port of Lyttelton suffered minor damage, but says its cargo terminal will be fully operational by 3pm on Monday, with little impact on shipments.