overview | geology | maps
The 100% Almaden owned Cerro Colorado project is located in Oaxaca State and covers an area of hydrothermal alteration and mineralisation typical of a high sulphidation precious metal system including vuggy silica and argillic alteration. The colourful hydrothermal
alteration on the Cerro Colorado was recognised by Morgan Poliquin during a regional helicopter exploration program and was acquired by Almaden through staking. This style of mineralisation hosts major gold
silver deposits worldwide, including the giant Peirina and Yanacocha
gold deposits in Peru. In addition zones of quartz veining have been identified. In these areas past soil sampling and IP geophysics conducted by Almaden have returned significant silver and gold in soil coincident with areas of elevated resistivity and chargeability. Almaden intends to better define these areas for a future diamond drilling project with detailed mapping and sampling in the winter of 2008/2009.
The property covers an area of intense hydrothermal
alteration developed in volcanic rocks intruded by quartz-feldspar
porphyritic rocks. Highly weathered and oxidised silicified and
acid leached porphyritic rocks occur over a more than 2 kilometer
by 2 kilometer area. These rocks display classic "vuggy silica"
textures. This texture is common in rocks that have been exposed
to highly acidic hydrothermal fluids and is indicative of a high-sulphidation
epithermal system. The areas of vuggy silica are intimately
associated with broad areas of intensely argillic altered host
rocks. Initial samples from outcropping vuggy silica and argillic
alteration have returned only anomalous values of gold, silver,
arsenic and antimony, however this is not uncommon in surface
exposures of weathered gold-rich vuggy silica bodies elsewhere.
Geochemistry and Geophysical Program:
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