43-101 2007 Technical Report On The San Antonio Project, Baja ...

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Derry, Michener, Booth & Wahl Consultants Ltd. Page 40of 0.201, 0.401, and 0.413 ppm, respectively. It is apparent that many standard assays reportedbelow the mean down to M+ 2SD and down to M+SD.Refer to Scatter Plots for QA/QC Standards: Figures 14.3.1, 14.3.2, 14.3.3, 14.3.4 .Appendix14.4 BlanksBlank material obtained from RockLabs and the corresponding results that Pitalla receives fromALS Chemex are also graphically analyzed.Pitalla’s QA/QC procedures establish a maximum limit of 0.015 ppm Au content to consider ablank sample analysis within range, anything above that value would trigger a re-analysis requestto ALS Chemex. A total of 11 samples were accordingly re-assayed and found to lie within thetolerance limit. (Refer to Figure 14.4 in-appendix)14.5 Requested Re-assaysA total of 155 samples from 17 RC holes were re-assayed as a result of unacceptable variationsbeyond the limits described in Section 14.2, 14.3, and 14, above. All passed.14.6 ALS Chemex Reno, Nevada Assay LabFrom November 7, 2007 to January 3, 2008, sample pulps from the Chemex Hermosillo prep labwere air freighted to the ALS Chemex assay laboratory in Reno. This was done to speed up assayturn around since the Vancouver facility was seriously over-booked. This practice wasdiscontinued immediately following this date, as the assays from the Reno lab were found to beconsistently 10% lower in Au grade than the assays from Vancouver. Samples from a total of 18holes were sent. Upon Minera Pitalla identifying this problem the samples pulps were redirectedto Vancouver. Chemex have resolved this problem and those pulp assays meeting the QA/QCprotocols are now included in the final data base.None of the Reno lab samples are included. (See review prepared by Minera Pitalla as Appendix3)14.7 Laboratory Cross Check SamplesCheck samples were not taken during the 2007 drilling program to date; the lack of same doesnot detract from this first resource estimation, in the opinion of DMBW.At DMBW’s recommendation a catch-up lot of 10 mineralized intervals from previously assayedholes were recently sent by bonded carrier to the Chemex Hermosillo lab with instructions toforward the reject pulp, including control samples, blanks, standards and duplicates to the ACMEPreparation lab in Guadalajara, Jalisco. In future about 2% of mineralized zone samples shouldbe routinely sent to ACME.
Derry, Michener, Booth & Wahl Consultants Ltd. Page 41As shown in table 14.7 (appendix), all samples passed QA QC satisfactorily. A graph of theseresults is shown in Figure 14.4.14.8 Twinned HolesUpon the recommendations of DMBW, the program was started in December and to year endvertical RC hole PL07-RC 20 had been twinned by vertical core hole 08LCDD-10, with thefollowing resultsTable 14.8 Twinned hole PL07 RC-20RC20Au DD10Auchips From To Metres ppm core From To Metres ppm20.4 79.9 59.5 1.92 30.6 94.0 63.4 1.51GT 20 114.2 GT10 95.787.5 172.8 85.3 1.37 102.0 185.0 83.0 1.98GT20 116.8 GT 10 164.3The cored hole was offset about 5 m and the intersections are about 10 m deeper, however theaverage grade-thickness products in the lower intercept are too variable.A total of 5 more RC holes were twinned in 2008 by core holes; assays are not available for thedata base but the geology and mineralization have been used to verify zone continuity.When this data is available a more informed opinion can be made. (See Section 17)14.9 ConclusionThe data verification measures observed by DMBW meet industry norms and there are no factorsthat would limit the use of such data.
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