28 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1902. [bull. 213. 
of the volcanic eruptions in the West Indies in 1902. As soon as Ms 
introductory sketch of the geology of the region is received the manu- 
script will be sent to the printer. It comprises an account of the 
geological relations of the various ore deposits of the region, main]} 7 
gold bearing, and a partial sketch of the famous Ilomestake lode, 
which is, unfortunately, incomplete because permission to enter the 
mine was withdrawn by the management before the study had been 
completed. 
WYOMING. 
During the summer of 1002 a geological party, under charge of 
A. C. Spencer, was engaged in an areal survey of the Grand Encamp- 
ment Mountains, of Wyoming, and in a study of the copper deposits 
occurring there. The writer spent some time with this party in the 
summer, and also examined the important deposits of the New Ram- 
bler mine, in the Medicine Bow Range, on the opposite side of the 
North Platte Valley. The mines in this region are as yet opened to 
only moderate depth and the study of their deposits can not yet be 
expected to yield important data bearing upon their genesis, but the 
extremely detailed and careful stud} 7 of the very complicated geological 
structure of the region made by Mr. Spencer and his associates will 
probably be of service in helping the development of its mines, and 
will certainly be an important contribution to our knowledge of the 
geology of the Rocky Mountain system. An abstract of this work is 
given on later pages. 
