Nine reverse-circulation holes were completed in late 2003, and a further 27 (4,389 metres) were sunk between February and May 2004. In the process, MacMillan intersected significant gold and silver mineralization.
The property is underlain by altered volcanic rocks of the Santa Rosa dome complex, near their contact with enclosing carbonate rocks.
Four holes were drilled in the southeastern contact area. One hole returned grades of 1.14 grams gold and 44.5 grams silver per tonne over 3 metres. This hole also intersected 3% lead and 2% zinc over 1.5 metres. Similar grades of 1-3.1% lead and up to 2% zinc were found over 3-metre widths in several holes. One hole, abandoned because of poor drilling conditions, bottomed with 1.5 metres grading 24.3 grams silver; the last 6.1 metres graded 16.8 grams silver per tonne.
Two holes were drilled in the San Leonides target, 3 km west of the aforementioned area. Highlights of this drilling included 7.6 metres grading 0.5 gram gold and 29.3 grams silver per tonne. One hole was deepened, resulting in 94.5 metres grading 0.23 gram gold and 33.6 grams silver.
Following a magnetic survey and an induced-polarization survey by Zonge Engineering & Research of Tucson, Ariz., seven holes were drilled in the San Leonides target. Highlights include 9.1 metres grading 0.37 gram gold, 39 grams silver, 1.41% lead and 0.80% zinc, and 4.6 metres grading 0.14 gram gold and 122 grams silver.
One hole failed to explain a magnetic anomaly. Another, drilled at the southwestern contact between the Santa Rosa dome complex and the enclosing carbonate rocks, intersected 13.7 metres of 1.41 grams gold, 14 grams silver and 0.17% zinc.
Results from 18 holes have yet to be received. Drill-hole samples were collected from each 1.5-metre interval down-hole, then sent to the Mexican facilities of BIS Inspectorate Laboratories and ALS Chemex. Diamond drilling is planned for the summer.
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