TMX group

Symbol: ASD (TSX-V) 
      : AMX (FRANKFURT)

BURNABY, BC, May 31 /CNW/ - Acero-Martin Exploration Inc. (the "Company")
is pleased to release further results from the on-going diamond drill program
on the Pinaya Property located 110 kilometers northeast of Arequipa in
Southern Peru. The Company is now in receipt of assays for holes PDH-012, 013,
014 and 015.
Highlights include the discovery of 46.80 m of porphyry intrusive,
grading 1.10 % Cu and 0.32 g/t Au in Hole PDH-015 from 9.50 m to 56.30 metres.
A second hole (PDH-014) located 850 m south of PDH-015 also intersected
porphyry mineralization, with 0.34% Cu and 0.31 g/t Au across 47.50 m between
13.50 and 61.00 meters. This hole was abandoned at 67.85 meters due to a cave
in.
Following the positive results, Drill hole PDH-016 was collared 50 meters
southeast of PDH-014. Assay results for PDH-016 are expected shortly.
Drill hole PDH-012 tested a chargeability geophysical anomaly located to
the northwest of the pit. It intersected variably altered and sheared
sedimentary rocks. The hole did not intersect porphyry.
Hole PDH-013 was collared 750 meters east of the main pit, and did not
intersect porphyry intrusive. The hole contained low concentrations of gold
and copper.
Hole PDH-014 collared about 400 meters west of the main pit and 850
meters south of hole PDH-015 was drilled to the northeast at an angle of 50
degrees. It intersected strongly altered porphyry intrusive from 9.50 to 
67.85 meters and returned 47.50 m of 0.34 % Cu and 0.31 g/t Au from 13.50 to
61.00 meters. However, the hole was lost at 67.85 meters due to a cave in. The
hole bottomed in porphyry intrusive and ended with a grade 0.51 g/t Au and
anomalous copper values (0.02 % Cu) in the final sample.
PDH-015 was collared to test the depth extension of the mineralization
identified within a surface trench that returned 58 meters of porphyry
intrusive grading 0.84 % Cu and 0.33 g/t Au (previously reported May 9, 2005).
Hole PDH-015 intersected porphyry intrusive from 7.85 to 56.3 meters and
returned 46.80 meters of 1.10 % copper and 0.32 g/t Au beginning at a depth of
9.50 meters. This drill hole was drilled towards the southwest at an angle of
60 degrees.
The Company is continuing with its surface program, including trenching,
soil sampling, mapping and prospecting. The surface program has been highly
successful and is continuing to uncover porphyry intrusive rocks. Several
trenches north of Hole PDH-015 have exposed porphyry intrusive rocks. Several
assays results are pending from this area and the Company expects to follow up
with additional trenching and drilling.
Jeff Reeder, P.Geo, and James McCrea, P.Geo, are the qualified persons
under National Instrument 43-101 for the Pinaya project, and are supervising
the quality-control and quality-assurance program. The HQ-size core is split
and samples are transported to SGS Labs (a laboratory certified by
International Standards Organization 9002) in Lima, Peru. Gold values are
determined by 30-gram fire assay fusion with an atomic absorption spectroscopy
finish. All samples are also analyzed for 35 elements by ICP, total digestion
and those samples anomalous in copper are reanalyzed by atomic absorption
(four-acid digestion). A quality-control program of standards, blanks and
duplicates is maintained. Holes were composited using a 0.30 % Copper cut-off.
The Company has cancelled 905,000 stock options issued to Directors,
employees and consultants granted November 26, 2004, October 2, 2004 and
October 27, 2004 at prices ranging from $1.18 to $1.65. The Company has issued
1,060,000 incentive stock options to Directors, employees and consultants
exercisable at $0.90 per share expiring May 27, 2009.

About Acero-Martin Exploration Inc.
-----------------------------------
Acero-Martin Exploration Inc. is an exploration company, which is focused
in locating and defining economic precious metals deposits. Currently the
Company has two exploration projects: Red Mountain in the Yukon Territories
and Pinaya in southern Peru.

This press release was prepared on behalf of the Board of Directors,
which accepts full responsibility for its contents.

On Behalf of the Board:

"Jeffrey Reeder"
--------------------------------
Jeffrey Reeder, President and Director

   The TSX Venture Exchange does not accept responsibility for the
                adequacy or accuracy of this release