356 
THE COPPER MINES 
the portion to be surveyed ; and hence our uncertainty 
as to the best mode to be adopted for conveying our 
equipage and supplies. As the Copper Mines are at 
an elevation of six thousand two hundred and fifty 
feet above the level of the sea, there must necessarily 
be great descents before reaching the lower plains. 
But the great advantage which wagons possess over 
every other means of transportation, where it is possi- 
ble to get through with them, induced me to use them 
as far as possible, at the same time keeping well pro- 
vided with pack-mules in case of emergency. 
The parties for the survey of the Gila were organ- 
ized as follows : 
Andrew B. Gray, U. S. Surveyor in charge of 
jparty for the Linear Survey. 
John Bull, 
J. H. Prioleau, 
Malcolm Seaton, ' 
James Steel, 
James T. Scott, 
^ 2d Assistants. 
Wm. a. Taylor, 
William Bausman, Glerh and Assistant. 
Eight laborers and servants; two stonecutters; one 
blacksmith ; one carpenter ; two cooks ; three arrieros, 
and one teamster. 
Lieut. A. W. Whipple, Topog. Engrs. in charge of 
the Astronomical and Topographical party. 
Henry C. Force, 
Frank Wheaton, 
Hugh Campbell, 
John O’Donoghue, 
■ Assistants. 
