The SPDR Gold Shares (NYSEArca: GLD) and the SPDR Gold MiniShares (NYSEArca: GLDM) are among the brightest stories in the commodities complex this year and that ebullience is expected to continue into year end. Worldwide holdings in gold-backed ETFs surged to 3,365.6 tons on Aug. 3, or up 30.5%...