There should be a standard security protocol for this... afterall they've been smelting and refining precious metals for a long time and I'm sure there has been all sorts of scams run by smelters and refiners in the past to cheat investors out of their money... there has always been thiefs and crooks and there always will be. There has to be standards in place to protect the investor. I'll do some research and see if I can find an answer.
As far as SFMI and GHDC is concerned, it's not an issue and it's probably not an issue withinin the mining sector because of standards and laws.