Metal discoveries

Gerelateerde afbeelding

As you know, the hot water, circulating deep, picks up whatever is there-gold, silver, molybdenum, mercury, tin, uranium-and brings it up and precipitates it out near the surface. A vein of ore is the filling of a fissure. A map of former hot springs is remarkably close to a map of metal discoveries. Old hot springs like this one brought up the silver of Nevada. It would do my heart good to find silver right here in this roadcut and put it to the local highway engineer.” He took some samples, which zakelijke energie eventually proved to be innocent of silver, and we got back into the pickup. We soon left the interstate for a secondary road heading north-up a pastel valley, tan, with a pale-green river course, fields of cattle and hay. It was a valley that had been as special to the Paiutes as the Black Hills were to the Sioux. The Paiutes gave it up slowly, killing whites in desperation to keep it, and thus bringing death on themselves. The first pioneers to settle in this “desert” were farmers-an indication of how lush and beautiful the basin must have appeared to them, ten miles wide and seventy miles long, framed in serrated ridges of north-southtrending mountains: range, basin, range. Magpies, looking like scalemodel jets, kept rising into flight from the side of the road and gaining altitude over the hood of the pickup. Deffeyes said they were underdeveloped and reminded him of Archaeopteryx, the Jurassic bird. We crossed cattle guards that were nothing more than stripes painted on the road, indicating that Nevada cattle may be underdeveloped, too, with I.Q.s in one digit, slightly lower than the national norm. For eight million years, Deffeyes was saying, as the crustal blocks inexorably pulled apart here and springs boiled up along the zakelijke energie vergelijken faults, silver had been deposited throughout the Basin and Range. The continually growing mountains sometimes fractured their own ore deposits, greatly complicating the sequence of events and confusing the picture for anyone who might come prospecting for ores. There was another phenomenon, however, that had once made prospecting dead simple. Erosion, breaking into hot-spring and vein deposits, concentrated the silver. Rainwater converted silver sulphides to silver chloride, heavy stuff that stayed right where it was andthrough thousands of millennia-increased in concentration as more rain fell.

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