Fracture geometries in three ore bodies mined by undercut caving as determined from oriented drill core and scanline mapping

Melvin, Michael T.; Panek, Louis A.

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Fracture geometries in three ore bodies mined by undercut caving as determined from oriented drill core and scanline mapping

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Personal Author:

Melvin, Michael T. ; Panek, Louis A.

Melvin, Michael T. ; Panek, Louis A. Less -
Corporate Authors:

National Institute for Occupational Safety and Health
Description:

"Block caving, a low-cost method of mining large low-grade deposits, has the potential for application to a larger class of mineral deposits than has been attempted heretofore, provided that quantitative methods can be developed to predict the span required to induce caving and the size distribution of the caved fragments. Prerequisite to employing a numerical method of structural analysis to evaluate the stability or failure of the rock mass in the vicinity of an excavation are the specifications of rock mass strength and fracturing (jointing). This Bureau of Mines report characterizes the fracturing geometries in three ore bodies that are mined by undercut-cave methods, utilizing data that were generated by measurements on oriented diamond drill cores and along multiple scanlines on underground exposures. Procedures employed for data acquisition and for data analysis are described in detail. Numerous polar equal-area plots of fracture orientation and histograms of fracture spacing, obtained by Bureau-developed codes fractan and gdist, are presented. Fracture-trace-length estimates are derived from the multiple-scanline mapping measurements, a new procedure." - NIOSHTIC-2

NIOSHTIC no. 10005638
Subjects:

[+]

Occupational Health Safety
Series:

Mining Publications
Subseries:

Report of Investigations
Document Type:

Text
Genre:

Report
Place as Subject:

Arizona ; Colorado ; OSHA Region 8 ; OSHA Region 9

Arizona ; Colorado ; OSHA Region 8 ; OSHA Region 9 Less -
CIO:

National Institute for Occupational Safety and Health (NIOSH)
Topic:

Workplace Safety & Health
Location:

North America
Pages in Document:

iii, 82 numbered pages
NIOSHTIC Number:

nn:10005638
Collection(s):

National Institute for Occupational Safety and Health
Main Document Checksum:

[+]

urn:sha-512:3e106751d30f1bf6b6f12fa17cd63945d1dc13a24f98119aa8fa70a7a44b773f031e4d2a563df2f91926f1654ccd4a44b738a74cf0f864321ee2671e88132a74
Download URL:

https://stacks.cdc.gov/view/cdc/10507/cdc_10507_DS1.pdf
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[PDF-33.51 MB]