Reply:In addition to the export dossier according to the current regulations, all kinds of papers proving the origin of minerals purchased by the enterprise for export, when the enterprise registers the customs declaration form, according to Circular No. 04/2012. / TT- BXD dated September 20, 2012 of the Ministry of Construction guiding the export of minerals for construction materials, in accordance with clause 3c Article 5 stipulating: For enterprises having business registration for mineral export activities production of processed minerals for export: Enterprises must have sale and purchase contracts, notarized copies of mineral exploitation licenses, value-added tax invoices and investment projects processing certificates. minerals of the seller.