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

previous Battle Mountain drilled holes for correlation purposes. Where lithological discrepancies
occur between the Castle Gold DDH and the Battle Mountain RC and/or core hole information,
both the Battle Mountain hardcopy logs and Castle Gold’s core were reviewed and re-logged if
necessary.
The verified data from the core logs was then inputted manually or digitally into Microsoft® Excel files.
11.2.2.2 Sampling Quality Assurance and Quality Control
11.2.2.2.1Sampling Quality Assurance by ALS-Chemex - Diamond Drillhole Sample Repeat Assay
As previously mentioned, ALS-Chemex provides gold fire assays with either Atomic Absorption
Spectroscopy (“AAS”) or gravimetric finish. Routine gold assays are by 30 g fire assays and the repeat
analyses have been carried out on pulps stored from the initial analyses. Two repeat assays were carried
out by ALS-Chemex from Castle Gold’s twin diamond drill program (Table 7).
Although only two repeat assay pairs were generated by ALS-Chemex, the original and subsequent gold
assays show acceptable repeatability for gold data (Table 7 and 8).
Table 7. Repeat assays performed internally by ALS-Chemex.
SAMPLE NUMBER
ORIGINAL FIRE ASSAY Au2 ASSAY Au3 ASSAY
(g/t Au)
(g/t Au) (g/t Au)
50303 0.428 0.727 0.571
50305 3.78 3.33 3.08
Arithmetic Average 2.104 2.029 1.826
11.2.2.2.2 Results for Assay Blanks
A total of 27 blank samples consisting of a buff colored brick material were inserted into the twin drill h
ole sample stream during sample collection. The blank sample material served as a measure for Castle
Gold and Howe to monitor for possible sample contamination at ALS-Chemex’s sample preparation
facility. Two coarse-grained clay-rich brick samples were submitted to ALS-Chemex for assay in order to
determine if the material was suitable as blank material. Gold values for both samples were below the
detection limit for gold (