Dear List, I received a block model which used a correlogram model to krig.
The ore-body strikes approx. N35E, dips approx. 35 degrees in NW direction. I modeled the variograms and found the followings: 1: My directions of anisotroy are along the inclined ore-body (the earlier correlograms were not along the ore body). 2: My ranges are shorter than the earlier correlogram ranges. earlier correlograms had two structures, which I don't see in my variograms. The likely reason for this is that the earlier person doing correlogram model did not keep its sill below a standard variance/ correlogram line. In my case I kept my variogram sills below the variance line (using ISATIS). 3: My search ellipsoid had same dimensions as earlier search ellipsoid, but my search ellipsoid oriented along the ore-body, where as the earlier one did not. 4: The measured and indicated resources are categorized based on distance (from block center to sample) and min.-max. number of samples used for interpolation of the block. I am getting approx. 30% of more resources in the measured category blocks. I am needing a valid explanation for this: I think, because of the re-orientation of my search ellipsoid (along the ore body), I am able to find more blocks meeting the minimum sample criteria for estimation (than the earlier model): Is this a valid reason? Secondly, also I think as my variograms are having shorter ranges, I am allowing more blocks to be estimated from nearest samples than the earlier model: Is this right? I'll highly appreciate your valuable comments/ suggestions. Regards, Abani R Samal ************************************************************ ABANI RANJAN SAMAL 11183 West 17th Avenue, APt 201 Lakewood, CO 80215 http://myprofile.cos.com/arsamal ____________________________________________________________________________________Yahoo! oneSearch: Finally, mobile search that gives answers, not web links. http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC
