by natsb88 » Fri Aug 08, 2014 5:00 pm
Kinda blurring a few things together here.
Smelting is the process of refining a metal from the raw ore. Smelters take silver ore from miners and make 999 or 9999 or whatever product is needed. Smelting doesn't typically involve a whole lot of post-consumer metal, as you would be taking a few steps back by tossing 999 or 925 or whatever into the pot with raw ore. Why send that stuff through the extra steps involved in smelting when it only needs to be refined.
Refining is taking less than pure metal (but only metal, not rocks or whatever might come in with ore) and purifying it to a desired level. i.e. sterling to 999 silver, scrap gold to 9999, or whatever. If a refiner accidentally tossed a fake in the pot, it would come out through the regular refining process anyway. Refiners have strict quality control, so even if they were melting a pot of what was supposed to be all 999 silver (which would rarely happen), they would be testing it and refining as needed.
Simple melters like myself take 999 silver, melt it, and pour it into new shapes. The 999 could be freshly refined shot from a refiner, or it could be post-consumer bars and rounds. This is where you would have the biggest risk of an issue, and why it's important to buy from melters who know what they are doing and have a reputation to uphold, rather than a fly-by-night eBay seller who might make pretty bars but doesn't have any legitimate brand to uphold. It should be fairly apparent when melting on this scale if something wasn't silver, but that's not to say it couldn't happen, or that somebody couldn't contaminate a crucible or mold and then put out very-slightly-less-than-999 products after that.