Comparisons between cross-measure boreholes and surface gob holes

Goodman, Tobias W.; Cervik, Joseph.

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners. As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.

i

Comparisons between cross-measure boreholes and surface gob holes

[PDF-1.13 MB]

English

Details You May Also Like

Details:

Personal Author:

Goodman, Tobias W. ; Cervik, Joseph.

Goodman, Tobias W. ; Cervik, Joseph. Less -
Corporate Authors:

United States Bureau of Mines.
Description:

"The Bureau of Mines conducted studies to compare the effectiveness of the cross-measure borehole system with that of surface gob holes on two successively mined retreating longwalls in the Lower Kittanning coalbed. Only the cross-measure system was in operation on panel a; on panel b, both systems were in operation. In addition, the cross-measure boreholes on panel b were drilled parallel to the face, whereas those on panel a were drilled at a 45 degrees angle with respect to the longwall axis. The studies show that the cross-measure system captured 71 pct of the methane generated by longwall mining on panel a. On panel b, the surface gob hole dominated over the cross-measure system for about 700 ft (213 m) after it was intercepted. Beyond that point, the cross- measure system dominated. About 93 pct of the methane generated on panel b was captured by the two systems. Cross-measure boreholes that were drilled parallel to the face were as effective as boreholes oriented 45 degrees with respect to the longwall axis. In addition, they were shorter and required less drilling time. Comparison between observed gas pressure differentials in boreholes and calculated values indicate that boreholes can be shortened further to 140 ft (43 m). Additional studies are needed to verify these calculations." - NIOSHTIC-2

NIOSHTIC no. 10005074
Subjects:

[+]

Boring. Coalbed Methane Drainage -- Testing. Longwall Mining.
Series:

Mining Publications
Subseries:

Report of Investigations
Document Type:

Text
Genre:

Report
Place as Subject:

Pennsylvania ; Pennsylvania -- Ebensburg Region

Pennsylvania ; Pennsylvania -- Ebensburg Region Less -
Pages in Document:

16 numbered pages
NIOSHTIC Number:

10005074
Resource Number:

RI-9013
Collection(s):

National Institute for Occupational Safety and Health
Main Document Checksum:

[+]

urn:sha-512:0e815a5f223871dd7e859d7a32f7c77fe18b68f93c8380e9aedef79051007691ab948c276b1f2d5f75b52338bafa02b5333caea5c644fbc549237d43db3e572c
Download URL:

https://stacks.cdc.gov/view/cdc/9601/cdc_9601_DS1.pdf
File Type:

No Additional Files

More +

Comparisons between cross-measure boreholes and surface gob holes

Details:

Supporting Files

You May Also Like