The silver that clears futures contracts and sits in vaults does not look like the products sold at retail. It arrives as rough cast bars weighing roughly a thousand troy ounces each.
The bars are cast, not minted
Molten silver is poured into open molds and allowed to cool, producing a bar with an uneven surface, rounded edges and visible casting marks.
There is no polishing or decorative stamping because none of it serves any purpose at this scale. The bar is a bulk industrial product.
Identifying marks are applied directly to the surface, typically including the refiner, a serial number, the assayed fineness and the actual weight.
Weights vary and are recorded individually
Unlike a one-ounce coin, these bars are not produced to an exact weight. Each is weighed after casting and its precise figure is recorded on the bar and in the accompanying documents.
Trades are therefore settled on the total actual weight of the specific bars delivered rather than on a nominal count multiplied by a round number.
That is why vault records list individual serial numbers and weights, and why a bar list is the meaningful document rather than a simple ounce total.
Handling constraints are physical
A bar of this size is heavy enough that it is moved with equipment rather than carried casually, and vaults are engineered for the resulting floor loading.
Silver's low value relative to its weight compounds this, since storing a given dollar value of silver takes far more space than the equivalent in gold.
Those handling and space requirements are the reason silver storage fees run higher than gold storage fees for the same amount of money.
The chain of integrity depends on custody
A bar that has remained inside a recognized vault network since it left an accredited refiner is accepted without reassay, because its history is documented throughout.
A bar that has left that chain has to be re-verified before re-entry, which costs money and time and can require melting and recasting.
This is why wholesale metal tends to stay within the vault system, changing owner through book entries rather than through physical movement.
Retail products are made from this material
Fabricators buy large bars and convert them into rounds, small bars and blanks for mints, adding the manufacturing cost that appears as a retail premium.
The premium on a small silver product is therefore not arbitrary; it is the cost of turning a rough industrial casting into something a consumer can buy.
Understanding that path explains why retail premiums can move independently of the wholesale price when fabrication capacity is stretched.