DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
GEORGE OTIS SMITH, Director 
BULiLETIN 580—B 
NOTES ON THE 
UNAWEEP COPPER DISTRICT, COLORADO 
B> S. BUTLER 
CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1913, PART I—B 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1914 
