Sidney Resources Corp (SDRC)

[surrealistrader]

Your interpretation focuses on the mass reduction aspect of concentration, not the gold content concentration, which is a fair and valid approach, but for the purposes of checking SDRC's work, cannot be used. SDRC, in this case, is calculating using the gold concentration rate (which is indeed 40-fold.)

Nobody was ever measuring density here, which, especially in the context of gold, usually refers to its physical property (19.3 g/cm³ for pure gold). We are discussing ore. When discussing ore, terms like "concentration," "grade," "assay," or "tenor" are more appropriate.

You have misapplied the mass reduction rate in calculating the gold grade of the stockpile. The 800-fold concentration refers to the mass reduction, but the gold concentration rate, which is about 40-fold, is the relevant factor for estimating the gold grade in the original ore.

Please stop being confused and move on. Consult someone if that's what it takes.