Coal Resource
Classification System of the U.S. Geological Survey
By Gordon H. Wood, Jr.,
Thomas M. Kehn, M. Devereux Carter, and William C. Culbertson
GEOLOGICAL SURVEY CIRCULAR 891
CONTENTS
- Introduction
- History of the
classification system
- Coal resource
classification system
- Glossary of coal
classification system and supplementary terms
- Criteria for coal
resource classification
- Applications of
criteria
- Specific criteria
- Guidelines for
estimating coal resources
- General
guidelines for classification of coal resources
- Specific
Instructions
- Rank of
coal
- Overburden
- Thickness
of coal categories
- Size of
unit area
- Major
categories of resources
- Coal
bed maps
- Thickness
of coal measurements
- Distribution
of coal bed thickness measurements
- Measurement
of areas
- Weight
of coal per unit volume
- Calculation
of coal resources
- Rounding
of tonnage estimates
- Estimation
of resources in the vicinity of where a coal bed
bifurcates into two or more tongues
- Estimation of
hypothetical resources
- Extrapolated
bed map method
- Extrapolated
coal zone method
- Examples
illustrating the basic geometric principles of
constructing coal resource bed maps
- Geophysical logs
as a source of coal bed data
- Electric logs
- Gamma ray log
- Density log
- Neutron log
- Acoustic velocity log
- Measurement of the coal bed thickness
- Composition and rank of coal
- Stratigraphy and structure
- Summary
- Intended audience
- References
ILLUSTRATIONS
- Format and
classification of coal resources by reserves and
subeconomic resources categories
- Format and
classification of coal resources by reserve and inferred
reserve bases and subeconomic and inferred subeconomic
resources categories
- Flow chart
showing hierarchy of coal resources and criteria for
distinguishing resource categories
- Diagram
showing reliability categories based solely on distance
from points of measurement
- Coal fields
of the conterminous United States
- Coal fields
of Alaska
- Coal regions
of the conterminous United States
- Coal
provinces of the conterminous United States
- Determination
of areas of reliability using coal thickness data only at
points of measurement along outcrop line
- Determination
of areas of reliability from points of measurement on the
outcrop line, supplemented by mine and drill-hole data
- Determination
of areas of reliability using coal thickness measurements
taken along a continuously exposed, strip-mined bed,
supplemented by drill-hole data
- Determination
of minimum thickness isoline
- Determination
of areas of reliability and overburden thickness
- A ridge
with construction of 14-inch minimum thickness limit
- Same ridge
as figure 14 with areas of reliability, coal thickness
isopachs, and overburden contour
- A simple
valley reentrant with construction of 14-inch minimum
thickness limit
- Areas of
reliability, overburden contours, and coal thickness
isopachs to accompany figure 16.
- A valley
and ridge with part of coal bed less than minimum
thickness but within determined 14-inch limit as
illustrated in figure 16
- Areas of
reliability, overburden contours, and coal thickness
isopachs to accompany figure 18
- Coal
categories in plane of coal bed, a structure section, and
coal categories as viewed projected to the ground surface
from plane of coal bed
- Areas of
resource categories for a flatlying coal bed based on
data only from underground mined areas and drill holes
- A small
coal basin divided into areas of coal resource categories
- A large,
simple coal basin divided into areas of coal resource
categories
- Suggested
form for recording coal resource data and calculated
tonnage estimates
- Suggested
format for tabulating data and calculating tonnages
- Early
conventional electric log (1957) of the Owanah Kendrick
No. 1 well, Big Horn County, Montana
- Induction
and conductivity geophysical logs (1960) of the
Hose-Austin Drilling Company from Bone Brothers No. 1
well, Rosebud County, Montana
- Examples of
oil- and gas-well geophysical logs from western Kentucky
that can be used for coal bed correlations and coal
resource evaluations
- SP, gamma
ray, acoustic velocity, normal resistivity, and induction
conductivity logs (1971) from Davis Oil Grady Fed No. 1-2
well, Sweetwater County, Wyoming
- SP, gamma
ray, density, dual induction-lateral log, and neutron
logs (1978) from Getty Tri-County No. 1 well, Rosebud
County, Montana
- Five
geophysical logs of a coal exploration drill hole showing
response to coal and limestone
TABLES
- Classification of
coals by rank
- Average specific
gravity and average weight of unbroken coal per unit
volume of different ranks
- Summary of coal
resource criteria
- Areas of reliability
from figure 13 listed by overburden and coal thickness
categories, and by counties
- Areas of reliability
from figure 15 listed in proper overburden and coal
thickness categories
- Areas of resource
categories from figure 17 listed in proper reliability
and thickness of coal and overburden categories
- Areas of resource
categories from figure 19 listed in proper reliability
and thickness of coal and overburden categories
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