Rio Fortuna Exploration Corp.
TSX VENTURE : RFT

Rio Fortuna Exploration Corp.

May 27, 2005 16:36 ET

Rio Fortuna Announces Results from Highland Drill Program

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - May 27, 2005) - Rio Fortuna Exploration Corp. (TSX VENTURE:RFT) announced today that it has been advised by Mauricio Hochschild & Cia. S.A.C. of Peru (MHC) of the results of the drill program at the Highland low-sulphidation project in the Walker Lane Trend, Nevada.

MHC completed a seven-hole, 2,190-meter core program, designed primarily to search for new mineralized shoots at the largely gravel-covered property (see Table-1). Only two of the seven holes drilled were in the vicinity of RFT's previously reported mineralization in the A Zone. One of the MHC holes, MHH-02, was drilled approximately 5 meters down-plunge of RFT hole H03015, RFT's deepest hole in the mineralized shoot. MHH-02 intersected a narrower interval of high-grade gold compared to H03015, but with much higher silver values. Another hole intersected a fault zone beyond which the A Zone was not encountered.

Several of MHC's holes intersected the B Zone at relatively shallow depths. MHC holes are deeper than historic drilling and encountered thicker quartz zones with better gold grades, indicating a vector of increasing grades with depth. Hole MHH-01 was particularly encouraging, intersecting 3.96 meters of 0.768 grams Au per tonne and 3.05 meters of 0.390 grams Au per tonne at shallow depth. Other MHC exploration holes intersected narrow intervals of low-grade gold and silver.

Rio Fortuna said it is reviewing project data to consider pursuing mineralization partially outlined by RFT previously, including a bonanza-grade RC drill intercept of 66.9 g/t Au and 397.7 g/t Ag over 1.5 meters from the A Zone (see news release December 19, 2003). The high-grade intercept occurs within a 12.2 metre section of 9.5 g/t Au and 109.4 g/t Ag. In addition, other targets have been identified that remain untested.

About Rio Fortuna Exploration Corp.

Rio Fortuna Exploration Corp. is exploring for high-grade gold deposits within two prolific gold producing geologic provinces, Nevada and Ontario. The low-sulphidation Highland, Baxter, Mud Springs, and Buz projects in Nevada, and the Archean-vein Drayton project in Ontario, all have significant high-grade gold potential.

Joe Kizis Jr., (P.Geo.) is the Qualified Person responsible for reviewing the technical results reported in this release.

On behalf of the Board,

Joseph Anthony Kizis, Jr. President

Rio Fortuna Exploration Corp.

Statements contained in this news release that are not historical facts are forward-looking statements as the term is defined in the private securities litigation reform act of 1995. Such forward-looking statements are subject to risks and uncertainties which could cause actual results to differ materially from estimated results. RioFortuna relies upon litigation protection for forward looking statements. Mauricio Hochschild & Cia. Ltda., accepts no responsibility for the use of project data used herein or in the adequacy or accuracy of this release.



TABLE 1
MHC Drill Results

--------------------------------------------------------------------
(65:1
Thick- conversion)
Drill Begin End ness Au Ag Au eq Vein
Hole Meters Meters Meters (g/t) (g/t) (g/t) Interpretation
--------------------------------------------------------------------
MHH-01 17.7 18.3 0.7 1.10 1.58 1.1 B Zone
--------------------------------------------------------------------
109.1 113.1 4.0 0.768 20.50 1.1 B Zone
--------------------------------------------------------------------
117.6 120.7 3.0 0.390 10.98 0.6 B Zone
--------------------------------------------------------------------
A Zone
faulted
out??? A ZONE
--------------------------------------------------------------------

--------------------------------------------------------------------
MHH-02 B Zone
w/ less
than
0.300 g/t
Au B Zone
--------------------------------------------------------------------
205.1 205.9 0.8 9.770 173.00 12.4 A Zone
Hangingwall
vein?
--------------------------------------------------------------------
249.3 251.4 2.1 2.040 182.60 4.8 A ZONE
--------------------------------------------------------------------
incl. 251.1 251.4 0.3 9.460 414.00 15.8 A ZONE
--------------------------------------------------------------------
253.1 253.7 0.6 0.519 31.90 1.0 Footwall vein?
--------------------------------------------------------------------

--------------------------------------------------------------------
MHH-03 165.3 166.0 0.6 1.560 25.10 1.9 A Zone
Hangingwall
vein
--------------------------------------------------------------------
239.4 240.2 0.8 0.974 36.20 1.5 A Zone
Hangingwall
vein
--------------------------------------------------------------------

--------------------------------------------------------------------
MHH-04 168.5 169.4 0.9 0.709 42.20 1.4 B Zone
--------------------------------------------------------------------
169.9 170.2 0.2 0.551 15.50 0.8 B Zone
--------------------------------------------------------------------
214.3 214.6 0.3 0.927 32.30 1.4 A Zone
Hangingwall
vein?
--------------------------------------------------------------------

--------------------------------------------------------------------
MHH-05 97.8 98.1 0.3 0.302 18.6 0.6 B Zone
--------------------------------------------------------------------

--------------------------------------------------------------------
MHH-06 95.7 98.8 3.0 0.390 7.42 0.5 A Zone
Hangingwall
vein?
--------------------------------------------------------------------

--------------------------------------------------------------------
MHH-07 NIL NIL NIL Northwest
Target area
--------------------------------------------------------------------



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Contact Information

  • Rio Fortuna Exploration Corp.
    Jay Oness
    (604) 899-2515 or Toll Free: 1-888-456-1112
    (604) 688-4670 (FAX)
    corpdev@mnxltd.com