1kg, 3kg, 5kg and up to 10 and 15 kg gold and silver blanks are amidst our specialized semi-final products for minting bullions and proof coins. The production technology we apply guarantees the precise grain structure of the material, which is the key to the final matt-gloss surface of the proof product.
Manufacturing larger coin blanks used for proof and proof-like coins requires a specialized methodology and technology. Bulmint has mastered the technology by utilizing twice the amount of the blank nominal weight and reducing its thickness by a controlled hot-forging process. The dimensions and shape are defined within the manufacturing tolerance band on a CNC milling machine.
The blank is then brushed on the Bula machine, and surface-finished according to the customer's RA requirement, using the customer-preferred method. Our production plant is equipped for CNC-turned polishing, ball-polishing and hand-polishing. We have refined our surface finishing method to proof quality even for bullion gold and silver products.
At every stage, the blanks undergo meticulous quality control.
