“ Mineralogy.—Gold, silver, and lead occur in abundance throughout all the mountains in the State. Large bodies of gold-bearing gravel are found along the Snake, Salmon, and Boisé rivers, the Boisé basin being noted for its auriferous gold deposits. About one-third of the lead mined in the United States comes from the Cœur d'Alêne district. ”

“ The soil is very fertile and the water supply abundant. The principal irrigated sections of the State are in the Bear, Snake, Boisé, Payette and Weiser river valleys. These valleys lie at an altitude of from 700 to 5,000 feet. The Snake river, a tributary of the Columbia, and the Wood, Bruneau, Boisé, Payette, Weiser and Salmon rivers, its principal branches, form the drainage system of the S. portion of the State; the principal rivers of the N. part are the Spokane, St. Joe, St. Mary's, Clearwater, Cœur d'Alêne, Priest, and North Fork of the Columbia. ”

“ The production and value of the principal metals in 1917 was as follows lead, 196,780 tons, valued at $33,846,119 zinc, 38,927 tons, valued at $8,145,122; copper, 7,827,574 pounds, valued at $2,136,928 ”