Barkerville Gold Mns Ltd BGMZF

RE:RE:bgm

[hammer161]

Metallic screen assays are used wgen there is the presence of coarse gold. In a normal fire assay procedure a 250 gram portion is crushed to a powder (a pulp as it is caled) and usually a 30 gram cut of this is taken for fire assay. If there is coarse gold you may get a piece of it in this 30 grams (which will over estimate the average grade) or it may be left in the bag (in which case the grade is underestimated). For a metallic screen assay they screen the entire 250 grams into a series of size fractions and assay all portions, getting all grains of any size. This way they get a more accurate assay of an individual sample. How many times higher or lower than a fire assay cannot accurately be predicted on a consistent basis.  The 20x higher than original fire assay does not seem a realistic number to be using in my opinion. Possible on the odd sample? Perhaps, but nowhere near that on a consistent basis, and it can give you lower results as well.  


Also keep in mind that this is a technique used for coarse gold as with evenly dispersed and smaller grains (down to a few microns) the nuggety effect does not occur. BGM does have this in places as evidenced by their drill hole results, and the camp is known to have narrow high grade structures. At the same time however they also have a lot of material (and assays) with low grades. The depoisit average as per resources is 2.0 g/t indicated and 2.74 g/t inferred. Realistically metallic screen assays may improve the results for some higher grade nuggety gold intervals, but the overall grades do not suggest that it is going to be  a useful or worthwhile endeavor for a large portion of the assays and in my opinion will not significantly increase the overall resource grade.