A new silver-rich zone is discovered in Guayabales, Caldas: drilling reveals 42 feet with 14.7 ounces per ton of silver ...

This is a preview. Log in through your library . Abstract The formation of quartzo-feldspathic rocks-principally pegmatites-is discussed from the viewpoint of thermodynamic stability of minerals and ...

Regionally extensive two-pyroxene granulite facies orthogneisses of Early Cretaceous age in Fiordland, southwest New Zealand, are criss-crossed by garnet-bearing feldspathic veins (and dikes) having ...

The property herein called the Red Star Project was staked to cover two epithermal quartz vein systems, the over 2 km long Red Star vein system and the western, 470m long segment, of the Double ...

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A chemical laboratory test made in St. Petersburg showed high concentration of copper, gold, silver and sulfide minerals in the quartz vein ST.PETERSBURG, July 22 (Itar-Tass) — Two third-year geology ...

THE author of this volume is an Oberbergrath, and also Director of the Imperial Mining Academy at Pribram. During the last seventeen years he has from time to time published notices of the mineral ...

IN the north-west of Sutherland the most ancient rocks belong to the Archæan series, and present a great uniformity in lithological characters. They consist mainly of coarse hornblendic gneiss, with ...