82 Copper and Silver of Kewenaw Point, Lake Superior. 
loose stones on Point Aux Iroquois, a blue, semi-transparent 
stone, weighing eight pounds, which he carried to England and 
deposited in the British Museum. This stone, he says, yielded 
sixty per cent. of silver. Quere. Was not this a mass of chloride 
of silver? If it is still in the British Museum, I hope some one 
will give an account of it. It is somewhat remarkable that 
neither of these travellers discovered copper or silver, or their 
ores, in the rocks in place. cr 
Since those ancient explorations, many individuals have trav- 
elled on the lake shores, and have described generally the loose 
masses of metallic copper seen in the soil or in the possession of 
the Indians. Henry R. Schoolcraft has given us a very particu- 
lar description of those which were seen by him during his ex- 
cursions with General Lewis Cass. He visited the great copper 
bowlder on the Ontanagon River, and has published a very accu- 
rate account of it in his travels, and in this Journal, Vol. III, 
with a plate. 
So far as I have been able to learn, no full description of the 
rocks and ores found in place has been published, excepting those 
of Dr. Douglass Houghton, who has given a general account of the 
geological structure of the country, and of the metalliferous con- 
tents of the rocks, in his interesting annual reports on the geo- 
logical survey of Michigan. A full and detailed description of 
the minerals and mines of that country, will be published in his 
final report, which will appear on the completion of his extensive 
and arduous surveys. 
My object in thiscommunication, is to give an account, for the 
information of miners and miveralogists, of the region which I 
have specially explored ; and in order to a more full understand- 
ing of the subject, I shall have to explain the geological structure 
of the country in which the mines are situated. 
I trust that some of my observations will prove interesting to 
the scientific community, as well as to those interested in mining. 
In July, 1844, I was employed by the trustees of the Lake 
Superior Copper Mining Company, to visit and examine certain 
tracts of land on Kewenaw Point, of which they had procured 
leases from the United States government. In the performance 
of this duty, I was assisted by Messrs. C. C. Douglass, Joseph S. 
Kendall, and Frederick W. Davis, and was accompanied by Hon. 
David Henshaw, one of the board of trustees. 
