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By Roberto Torretti.

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By Roberto Torretti.

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8 Un- (footnote continued from previous page) (perhaps more than three thousand feet below), since otherwise their gas content would foam them into pumice, rhyolite, or tuff. They are ultimately exposed by erosion and lowering of the mean surface. 8 Cf. G. Montague Butler, Some Facts About Ore Deposits, passim. Page 9 fortunately, not one of these assumptions is true as a statement of principle, and it was already being theorized by the scientifically educated that far different causes were at work, producing almost diametrically opposed effects.

Gold bullion salvaged from the open sea is as untarnished as though it had been lost yesterday instead of centuries ago. Thus free placer gold can turn up in virtually any sort of formation, no matter how theoretically unpromising, provided only that action of some sort at one time deposited it there. 13 E. D. Wilson, J. B. Cunningham, and G. M. Butler, "Arizona Lode Gold Mines and Gold Mining," University of Arizona Bulletin, Vol. V, No. 6, 24851. Page 20 The prospector was particularly interested in color, and his heart beat faster when he found the blossom of mineral salts "painted" upon a ledge or outcrop.

Godley), III, 102106. Page 5 the rock. We would squander half a column of adulation on the shaft, or a new wire rope, or a dressed pine windlass, or a fascinating force pump, and close with a burst of admiration of the "gentlemanly and efficient Superintendent" of the minebut never utter a whisper about the rock. And those people were always pleased, always satisfied. 4 So it is evident that the truth, as prospectors and miners understood it, was extraordinarily hard to come by until the happy day in about the year 1550 when the German physician Georg Bauer (Georgius Agricola) broke down their reserve.

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