Visit to Acron 2016-07-29 17:00:00 Veliky Novgorod Vladimir Putin visited Acron, one of the world’s largest mineral fertiliser producers, as part of his working trip to Veliky Novgorod. The President toured Acron’s production facilities where a new project called Ammonia-4 has been launched. Mr Putin also took part in a videoconference, which included the launch of Acron’s unit, Oleny Ruchey mining and processing complex in the Murmansk Region.