PSN-L Email List Message

Subject: Re: Hello
From: james fisher kd6iwd@.........
Date: Thu, 26 Jul 2001 13:05:07 -0700 (PDT)



--- wildboar  wrote:
> Thanks for your informative reply.  We do realize
> that there is "settling"
> of structures that would produce cracks, etc. 
> However, the mine was dormant
> for several years and development pursued.  Some
> even suggest that there
> were some back-alley deals made in the what was
> believed to be a period when
> the mine was no longer in use.  Evidence of large
> cracks, pictures falling,
> wells going dry, ....and most influential is a
> letter from the State Fires
> Marshall's office declaring that it is their opinion
> that the blasting
> causes "harm to life and property".  Pretty
> damaging.
> 
> So, we are attacking this at all angles.  The
> monitoring suggestions you
> have will be a benefit to us all. Thanks.
> 
> Patrick Wilber
> 
> ----- Original Message -----
> From: "Doug Crice" 
> To: 
> Sent: Wednesday, July 25, 2001 12:52 PM
> Subject: Re: Hello
> 
> 
> > There is a special class of seismographs used for
> "blast monitoring"
> > manufactured by Geosonics http://www.geosonics.com
> , Instantel
> > http://www.instantel.com/ , Vibratech and Thomas
> Instruments
> > http://www.vibration.com/index.htm
> >
> > These instruments use geophones as the basic
> sensor, monitored
> > continuously electronically, and they
> automatically digitize and save
> > any data with a vibration event.  They are about
> the size of a brick,
> > and connect to a laptop.  Software provided by the
> companies analyzes
> > the data for peak particle velocity, spectra, and
> of course time of
> > occurance.
> >
> > The basic units cost a few thousand dollars, and
> they can be rented for
> > some fraction of the cost.  While it is possible
> to construct your own
> > device to measure these vibrations, it is highly
> unlikely that the data
> > would stand up in court.  Whether you could rent
> one and put together a
> > credible case is also unlikely, since you would be
> testifying against
> > experts. Some of the companies listed above
> provide the service.
> >
> > If you really want to attack this problem, the
> surest approach is to
> > hire your own consultant, preferably one smarter
> and more prestigious
> > than the one used by the mining company.  The
> mining company consultant
> > may or may not be right. I should caution you also
> that a lot of blast
> > damage is imaginary.  Cracks appear in houses and
> sidwalks for a variety
> > of reasons and they always get blamed on blasting
> when there is some in
> > the area.
> >
> > > wildboar wrote:
> > >
> > > Dear Folks,
> > >
> > > I am new to this site and my knowledge of its
> contents is limited.
> > > The reason I am interested is that our community
> lives near a mine
> > > that blasts to recover product.  The land use
> has changed considerably
> > > over the last 10 years (from agricultural to
> > > ag-residential/residential/commercial) and we
> are experiencing damage
> > > due to the blasts.
> > >
> > > The "governing" authority for mines is the State
> Fire Marshall...and
> > > the laws governing mining are full of loop holes
> at best.  The
> > > immediate problem is that the mine self-monitors
> their blasting
> > > activities through a subcontractor.  First, many
> in the community do
> > > not believe that the mine always makes aware the
> State when they are
> > > to blast and second, we do not believe the
> reported results are
> > > accurate.
> > >
> > > What type of equipment could a home owner put in
> place that could
> > > monitor such activities, be defensible in court,
> and be not to pricey?
> > >
> > > Thank you for your responses.
> > >
> > > Sincerely,
> > >
> > > Patrick Wilber
> >
> > --
> > Doug Crice http://www.georadar.com
> > 19623 Via Escuela Drive       phone 408-867-3792
> > Saratoga, California  95070  USA fax 408-867-4900
> >
>
__________________________________________________________
> >
> > Public Seismic Network Mailing List (PSN-L)
> >
> > To leave this list email
> PSN-L-REQUEST@.............. with
> > the body of the message (first line only):
> unsubscribe
> > See http://www.seismicnet.com/maillist.html for
> more information.
> 
> 
>
__________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email
> PSN-L-REQUEST@.............. with 
> the body of the message (first line only):
> unsubscribe
> See http://www.seismicnet.com/maillist.html for more
information.


__________________________________________________
Do You Yahoo!?
Make international calls for as low as $.04/minute with Yahoo! Messenger
http://phonecard.yahoo.com/
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


[ Top ] [ Back ] [ Home Page ]

Larry Cochrane <cochrane@..............>