Map showing mined areas of the Boulder-Weld coal field, Colorado

Miscellaneous Field Studies Map 513
By:  and 



Compiled by Raymond E. Lowrie, U.S. Bureau of Mines (1966), and revised by Roger B. Colton, U.S. Geological Survey, assisted by Harold R. Fitch, 1972.

In the revision of this map, many mine maps and two unpublished general small-scale maps of the area by F. H. Canis (deceased) and Samuel Tescher (deceased) were used.  Much information was obtained orally from Louis A. Gaz, Consulting Engineer, Lafayette, Colorado.  Faults shown are from published and unpublished geologic maps of the Erie, Frederick, Lafayette, and Louisville quadrangles by Frank D. Spencer (1961), U.S. Geological Survey; from field work by Colton, and from many large-scale unpublished mine maps loaned by Louis Gaz.

Users of this map should consult copies of the large-scale mine maps in the Office of the Colorado State Coal Mine Inspection Group for exact outlines of mined-out areas.  Areas affected by collapse over mined-out areas may be larger than limits of mine workings.  Depth to mined coal increases generally from west to east and ranges from zero at the outcrop to as much as 500 feet.  Boundaries of workings should be verified by drilling.  Shafts and drifts are only approximately located, and some may not be shown.

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Map showing mined areas of the Boulder-Weld coal field, Colorado
Series title Miscellaneous Field Studies Map
Series number 513
DOI 10.3133/mf513
Year Published 1973
Language English
Publisher U.S. Geological Survey
Description 33.95 x 21.75 inches
Country United States
State Colorado
Scale 0
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