English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The Girard coal field in easternmost Richland County, Montana, is an area of about 1,035 sq miles. The field contains estimated original resources of 5,107.4 million tons of lignite. Measured and indicted resources in beds 5 to 10 ft thick 388.8 million tons, and measured and indicated resources in beds more than 10 ft thick total 155.9 million tons, and much of this coal is overlain by less than 200 ft of overburden. The coal is ranked as lignite A, with heat content ranging between 7,000 and 8,000 btu/lb on the moist mineral-matter-free basis. The average ash content is about 8%, and the average sulfur content is about 0.7%. Twenty-eight townships in the coal field contain estimated resources of lignite. A very large part, about 87%, of the estimated resources are inferred because of lack of data about thickness and continuity of the coal beds underlying broad interstream divides and gravel-capped upland terraces. Bedrock throughout the coal field is the coal-bearing Tongue River Member of the Fort Union Formation of Paleocene age. (47 refs.)

Coal resources and Cenozoic geology of the Girard coal field, Richland County, Montana