Julhendra That is what your semi-variogram is for. Determine maximum distance and anisotropy (change with direction) from your experimental semi-variograms.
Your search strategy should also change with the shape of your blast layout. Single blast patterns are usually 'long and thin', meaning that a circular search would be less than optimal. I don't know of any papers which discuss this, but you can see our strategy in the kriging game. This is freely downloadable at: http://uk.geocities.com/drisobelclark/briefcase.html and allows you to experiment with search patterns and changes in semi-variogram model. It also allows you to see the difference between kriging as a 'point' estimation method (for mapping) and kriging an average over a blast area. Unfortunately, this free package is only 2d, but you may find it useful. One other point you may find useful. In my experience, working in 3d reduces to using the previous bench blastholes. A full 3d approach is only useful if you have good diamond or percussion drilling within the search volume. If you are going to combine sampling types, you need to determine whether the samples are compatible or to use a co-kriging approach. Isobel Clark --- Julhendra Solin <[EMAIL PROTECTED]> wrote: > Dear All, > > I am working on blasthole interpolation in open pit > mine. Interpolation > using ordinary kriging and grades interpolated also > from above bench. > Blasthole spacing about 10 m and bench height 15 m. > Anybody could help me > how to determine search distance and min/max of > number of samples to krige > the grade. May be some technical paper related to > it. > > Thanks. > > Jul > > > -- > * To post a message to the list, send it to > [EMAIL PROTECTED] > * As a general service to the users, please remember > to post a summary of any useful responses to your > questions. > * To unsubscribe, send an email to [EMAIL PROTECTED] > with no subject and "unsubscribe ai-geostats" > followed by "end" on the next line in the message > body. DO NOT SEND Subscribe/Unsubscribe requests to > the list > * Support to the list is provided at http://www.ai-geostats.org __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- * To post a message to the list, send it to [EMAIL PROTECTED] * As a general service to the users, please remember to post a summary of any useful responses to your questions. * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list * Support to the list is provided at http://www.ai-geostats.org
