San Marco Resources (TSX VENTURE:SMN) is pleased to provide an update of
exploration activities at its 100% owned 8500 ha. La Buena property in
Zacatecas, Mexico. The property is located approximately 9 km north of
Goldcorp's Penasquito mine, and 1.5km west of Dia Bras Las Coloradas project
currently being drilled. 


Previous exploration by San Marco identified coincident I.P., surface and
airborne mag. highs, and gold in soil anomalies now called the Julia Zone.
Trenching has commenced in areas of anomalous gold in soils. A total of 14
trenches are planned over an area of 1 km X 1.2 km where outcrop is scarce,
however, overburden and rubble appears only to be about 1m deep. Initial
indications of the first 2 trenches have shown gold to occur in altered
granodiorite dikes up to 10m wide, as well as in the oxidized flanking Carocol
metasediments (hornfelsed siltstone/sandstone) for up to 40m from the intrusive
contacts. Several dikes occur in each trench. It is expected that trenching will
be completed in 6 weeks and assay results from this work, coupled with the
geophysical anomalies will aid the geological team in spotting drill holes.
Initial drilling is expected to test an extremely high chargeability anomaly,
approximately 100m below the surface, in the center of the Julia Zone. (To view
the graphics, please go to the company website:
http://www.sanmarcocorp.com/s/LaBuena.asp)


Additional exploration 1.5 km north of the Julia Zone has identified
mineralization in chimney style formations of the La Caja unit (limey
siltstones) known to host ore bodies in the area. The hinge line of the Zuloaga
Ridge anticline trends from the Dia Bras property on to San Marcos concession.
Initial spot sampling by San Marco returned 2.4 g/t gold; 24.4 g/t silver; 0.48%
lead and 5.87% zinc. Continuing exploration on Zuloaga Ridge Zone will include;
I.P. and ground mag. surveys to assist in identifying intrusive rocks which are
a key component to mineralization in the area. Upon completion of this phase of
exploration, it is expected that Zuloaga Ridge drilling will follow the Julia
Zone drill program.


Initial exploration will also commence in the southern section of the La Buena
property. Previous airborne mag. anomalies will be followed up with I.P., ground
mag. and MMI soil surveys, again expected be initiated in the next 60 days. (To
view the graphics, please go to the company website:
http://www.sanmarcocorp.com/s/LaBuena.asp)


San Marcos Chairman Robert Willis states, "La Buena is shaping up to have
numerous exploration targets with multiple styles of mineralization. Initial
indications of gold occurring in intrusive rocks as well as the adjacent
metasediments in the Julia Zone trenches; give our geological team great
confidence in indentifying additional significant mineralization."


The technical information contained in this press release has been based on
information reviewed by San Marco's President, Robert D. Willis, P. Eng., a
'qualified person' for the purpose of National Instrument 43-101, Standards of
Disclosure for Mineral Projects of the Canadian Securities Administrators.


To view the graphics, please go to the company website, or click on the
following link: http://media3.marketwire.com/docs/0505SMN.pdf
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