Gold in porphyry copper systems / 
by Edwin W.Tooker 
 - Washington, D. C. :  United States Goverment Printing office,  1990 
 - 55 p. :  il. ;  28 cm. 
 - Geology and resources of gold in the united states / ch.E(U. S. Geological survey Bulletin ; 1857) .
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Golg ores--West (United States)<br/>Copper ores--West (United States)<br/>Geology--West (United States)