Your post overlooked a few facts so I let google.com do the walkin'.
In the 1920's Homestake mining introduced a new technological advancement in mining called the St. Joe shovel. This improved extraction rates dramatically. In short they were able to mine MORE ore thus accounting for the rise in their stock. In short it had nothing to do with the price of gold!!That small fact seems to be overlooked by the gold site you pulled your information from unless Gold stocks now have a new St. Joe shovel. <gg>