Routine United States Mining Seismicity
The catalog, "Routine Mining Seismicity in the United States", provides listings of routine explosions and planned roof collapses at mines and quarries in the United States. For the period May 1997 through March 2000 the catalog was called "Probable Mining Explosions in the United States".
•GOAL AND SCOPE OF THE CATALOG explains the seismological context in which the routine explosions and collapses are recorded and their locations calculated: we discuss uncertainties in the magnitudes of the cataloged seismic events and variations in the completeness of the catalog.
•EVIDENCE USED IN IDENTIFYING ROUTINE MINING SEISMICITY explains the evidence that is used to identify routine explosions or planned collapses, and we note that in some areas a few natural earthquakes or unplanned rockbursts may be listed in the catalogs of routine mining seismicity.
•EXPLANATION OF CATALOG LISTINGS explains the parameters listed in "Routine Mining Seismicity in the United States".
•MINING SEISMICITY SOURCE REGIONS summarizes what we know about mining districts from which we have recorded explosions, planned collapses, and rockbursts.
Determination of Fracture Flow at the Coles Hill Uranium Deposit in Pittsylvania County, Virginia Using Electrical Resistivity and Cross Borehole Methods
Gannon, J. P.; Burbey, T. J.; Bodnar, R. J.; Aylor, J.
American Geophysical Union, Fall Meeting 2008, abstract #H13A-0910
Virginia Tech researchers are currently conducting a comprehensive investigation on the Coles Hill uranium deposit in Pittsylvania County, Virginia.
This multi-faceted project includes geophysical, structural, hydrological, mineralogical, geochemical, and petrological studies to characterize the deposit in situ and to develop a genetic model to describe the origin of the deposit.
The deposit is located to the west of the Chatham Fault, which separates the Mesozoic metasedimentary basin to the east from the host Leatherwood Granite.
The hydrogeology of the Coles Hill area is typical of the Piedmont region, with ground- water flow confined to fractures in the crystalline bedrock underlying a shallow regolith.
Eleven electrical resistivity profiles were obtained that identify potential subsurface permeable fractures within the ore body and possibly along and across the Chatham fault.
Initial interpretations of the resistivity data show several low resistivity zones that trend west to east toward the Chatham fault along inferred perpendicular fault traces, possibly indicating fracture pathways for ground-water flow.
Monitoring wells will be established along these profiles to perform borehole geophysical logging and cross-borehole testing to further describe the fracture properties and related hydraulic characteristics of the site.
Understanding the amount and locations of groundwater flow at Coles Hill is critical for developing a water usage and dewatering plan should the deposit be mined.
Read more:
http://earthquake.usgs.gov/earthquakes/eqarchives/mineblast/
http://adsabs.harvard.edu/abs/2008AGUFM.H13A0910G
