The Lolo Trail


Book Description

A thorough history of the Indian trail taken by Lewis & Clark from the headwaters of the Clearwater River to the Columbia, which later became a trail to the gold fields of Montana.




Directory, Forest Service


Book Description




The United States Geological Survey, 1879-1989


Book Description

A history of the relation of geology during the first 110 years of the US Geological Survey to the development of public-land, federal-science, and mapping policies and the development of mineral resources in the United States.




Skarns in British Columbia


Book Description

Skarns in British Columbia have historically been important sources of iron, tungsten, copper, and gold. This publication begins with an introduction on skarn terminology and the problems of skarn identification. It then reviews a genetic model of skarn formation and presents descriptive profiles of eight types of skarn deposits; describes the database of at least 735 skarn occurrences in the province, and the number and distribution of skarns in British Columbia according to their associations, class, age, and distribution; and notes the ages of British Columbia skarns and the total production of various metals extracted from British Columbia skarns. Subsequent sections provide information on assays and metal ratios of mineralized skarns, skarn mineralogy, skarn mineral chemistry, chemistry of skarn-related intrusions, and the mapping and evaluation of skarns. The appendix contains a listing of 735 skarn occurrences in British Columbia, giving deposit name, MINFILE number, latitude/longitude, elements and minerals present, and associated rocks and their ages.