BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 6, pp. 221-240, PL. 11 March 5, 1895 



CHARACTERISTIC FEATURES OF CAT.IFORNIA COLD-QUARTZ 



VEINS ^'^ 



BY WALDEMAR LINDGREN 



{Read before the Soeiety December 20^ ISDJ/.) 

 CONTENTS 



Page 



Introduction 221 



Geographic «liytril)ntion 222 



Geologic relations 222 



Age 225 



Differing types of gold deposits 22G 



Structural relations .' 220 



The filling of the veins 229 



Association of niinemls in gangue and ores 230 



Distribution of the gold in the veins 231 



The alteration of the country-rock 232 



Genetic conclu.sions 23(5 



Comparison with quicksilver deposits 2:)8 



Origin of the gold 230 



Summary 240 



Introduction. 



The gold-quartz vein.s of California, in spite of many local variation.'^, 

 form a remarkal)ly well defined type of mineral deposits, the salient 

 characteristics of which it is intended to portray in this paj)er. Tlu; 

 results, indicated in hrief outlines, have been obtained during general 

 and detailed mapping for the United States Geological Survey in the 

 gold-bearing region of (,'alifornia. 



Referring to the map of the distril)Ution of veins, it should be stated 

 that Inyo county, as well as the central and eastern part of San Ber- 

 nardino, contains many gold deposits which have not l)een indicated. 

 In many cases they carry both silver and gold, like the Comstock mines, 



* Published My permission of the Diro<-tor of tlio U. S. (jJooloKiciil Survey. 

 XXXI-Hli.i.. (iEOL. 8«K-. Am.. Voi,. 0. 18»4. (221) 



