RE: In Situ Valuation CalculatorRe-post from what I noted on the CAN board: "Those numbers tend to vary greatly depending on who's doing the valuation, price of gold, costs of operations. Last I spoke with someone who earns a living making those decisions, it was about $70 for inferred, $75 for measured and indicated, $240 for probable and proven (assuming costs of about $400 per ounce produced and gold at $1600). General rule: Price of gold - cost of production x 5% (or 6% and 20% respectively)."