Here is an excerpt from another companies NR that came out today. It shows you how some companies use an XRF to scan drill cores and decide what sections of a core need to be assayed. By using the XRF and a controlled tecnique, you are able to conclude how much of a drill core is mineralized and to what extent. There is a large margin for error if not used correctly and data compiled to check the accuracies of the readings. The more check assays against the XRF readings, the more dependability can be established by cross referencing.When used properly, these guns give the geo x-ray eyes and makes their job much easier and more proficient. A well controlled use of one of these guns can pay for itself by cutting down on the amount of lab assays over time and speeds up the field work ,whereas geo,s don,t have to wait for lab results to proceed with drilling,sampling,planning, etc.

http://www.usetdas.com/TDAS/NewsArticle.aspx?NewsID=20093

The top 90 metres of both holes were similar geologically and geochemically in alteration style and associated mineralization. Random spot checks with the portable XRF indicate that gold pathfinder minerals, together with the typical epithermal alteration patterns, continue to the bottom of BB12-07 and are still open at depth.

The portable XRF analysis was undertaken with random spot checks in BB12-06 for gold and gold pathfinder minerals in the altered zones as well as in and around the veins. After the initial identification in BB12-06 of consistent high concentration of gold pathfinder minerals, as well as indications of gold itself, a more intensive program to create a continuous detailed geochemical down-hole profile is being undertaken to sample BB12-07 in detail, in its entirety.

The XRF sampling in BB12-07 was undertaken by the spot checking method approximately every .3 metres with many samples being repeated. The XRF analysis reported various concentrations of gold from a depth of approximately 15 metres to 225 metres where detailed testing has been completed. Gold was not detected by XRF analysis in samples taken on or immediately near the galena veins and barren quartz veins. The XRF gold results indicate that gold mineralization may be dispersed through the various rock units, rather than in the veins themselves or favouring any individual particular rock unit. The gold pathfinder minerals are also widespread in the various altered zones through much of the 225 metres of detailed XRF sampling and are also present in the initial spot checks of the remainder of BB12-07. These are to be resampled in detail by XRF.

The XRF analysis in BB12-07 between 15 metres and 225 metres had 524 readings showing gold results ranging between 1.12 ppm (1 ppm equals 1 gram per ton) and 125.00 ppm. Of the 524 gold readings 78 returned results from 1.12 ppm to 9.99 ppm, 380 readings were between 10.00 ppm to 14.99 ppm and 66 samples were reported over 15 ppm. Gold values reported vary in concentrations from one alteration pattern to another as well as with pattern changing pathfinder mineralogy.

The portable XRF gold analysis results are only indicative of the potential for gold and are not meant to be representative of the actual grades of gold in the drill core itself. Reliable gold analysis can only be accurately determined through accredited laboratory analysis.
Drilling, XRF sampling and core logging are continuing and once completed samples will be sent to accredited labs for analysis to determine the levels of gold present in the drill holes and to confirm the gold pathfinder mineralization identified in the detailed portable XRF analysis.