43-101 2008 Technical Report On The La Fortuna Project, Durango ...

11.0 DATA VERIFICATION
11.1 INTRODUCTION
A quality assurance and quality control program (“QA/QC”) covering the database management and
sampling programs of Castle Gold’s hole twinning diamond drill program was administered and
monitored on a number of levels throughout the program.
A strict adherence to the data management procedures and geological administrative framework facilitated
Castle Gold and Howe’s internal due diligence program. The aims of the review procedures of data
collection, input, and ultimately data validation, seek to illustrate the quality of data handling achieved on
the project. Where errors were identified in the database, Howe staff reviewed the erroneous data, verified
the hardcopy records (i.e.; sample tag booklets, digital data files, etc.) and made the amendments if the
data was incorrect.
An analytical QA/QC program was not implemented by Castle Gold during this program since no local or
commercial standard reference materials were available. However, Howe used blank material and
initiated a particle size analysis study for monitoring ALS-Chemex’s sample preparation protocols.
11.2 ANALYTICAL DATA CORROBORATION AND QUALITY ASSURANCE AND
QUALITY CONTROL PROGRAM
11.2.1 Laboratories Used By Castle Gold for the Twin Drilling Program
Samples collected during Castle Gold’s twin diamond drill program were submitted to the following
laboratory:
• ALS-Chemex Laboratories (“ALS”), Hermosillo, Mexico (sample preparation);
• ALS-Chemex Laboratories (“ALS”), Vancouver, British Columbia (sample analysis).
ALS-Chemex employs a procedure of internal submission of standards and blanks as well as carrying out
repeat assays on approximately 10% of the client submitted samples. ALS provides an electronic QA/QC
file with the results of their internal blanks and standards analyses. ALS-Chemex’s internal QA/QC was
reviewed by Castle Gold and Howe staff upon reception in order to compare ALS-Chemex’s results to
Castle Gold’s QA/QC blanks.
Howe has not carried out an audit of the ALS-Chemex sample preparation laboratory in Hermosillo.
11.2.2 PQ Hole Twinning Quality Assurance and Quality Control Program
Castle Gold’s hole twinning diamond drill QA/QC program consisted of the following stages/steps:
• Data acquisition and validation; and,
• Sampling Quality Assurance and Quality Control.
11.2.2.1 Data Acquisition and Validation
The following steps were carried out during the data acquisition and validation of the lithological and
collar and assay data:
• For the core logs, all data was recorded on hardcopy core log sheets;
• The hardcopy of the core logs was reviewed by Howe’s geologist in order to verify that the
number and insertion sequence of blanks was correct, and;
• The geological information for each core log was then drafted onto cross-sectional maps. The
lithology from the completed drillhole was then cross-referenced with the lithologies of the
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