COPPER. 
The papers here presented represent the results of the last year's 
field work by the Survey in various copper-mining districts. These 
papers give, practically, a summary of the copper-mining industry of 
the United States, with the exception of the important Lake Superior 
district. The Lake Superior copper deposits were examined by the 
Survey at an early date, and the resulting report will be found cata- 
logued in the "List of Survey publications on copper," on page 186. 
Other districts producing copper, but to a less value than the precious 
metals, will be found discussed under "Gold and silver, 1 ' pages 31 
to 90. 
ORE DEPOSITS OF BINGHAM, UTAH/' 
Bv J. M. BOUTWELL. 
INTRODUCTION. 
Field work. — During the field season of 1000 a detailed geologic 
examination of the Bingham Canyon district in the West Mountain 
Mining District, Utah, was conducted under the immediate direction 
of S. F. Emmons, geologist in charge, by Arthur Keith and J. M. 
Boutwell. The areal mapping was taken up in the summer by Arthur . 
Keith and J. M. Boutwell and continued into the fall by the latter, 
and the ore deposits were studied in the winter by J. M. Boutwell. 
In the summer of 1900 G. II. Girty was engaged for one week in 
special paleontological studies in this field. During brief visits by 
the writer in 1901-2 additional data on special areal and economic 
problems were obtained. 
An area of 24 square miles, embracing the Bingham Canyon mining 
listrict, was mapped geologically on a scale of 1,666+ feet to the inch. 
Those portions of the Oquirrh Range which adjoin this area on the 
lorth, west, and south were studied en reconnaissance, and the ore 
leposits in all accessible underground workings were examined. 
)wing to the fact that the geologists engaged in this work were 
letailed to other fields during the field season of 1901 and 1902 for 
exceptionally long periods, insufficient time for the earlier prepara- 
|ion of this report has remained. The complete report on the results 
■The complete report, of which this paper is an abstract, will appear at an early date asa 
|roft'ssiomil paper. 
105 
