Minefinders Corporation LTD. (MFN)

[Ed Monton]

Minefinders Discovers More Silver in Sonora, Mexico

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - Feb. 28, 2005) - Minefinders
Corporation Ltd. (the "Company") (TSX:MFL)(AMEX:MFN); Mark H. Bailey,
President and CEO, reports results from recent drilling at the Company's
100% owned Real Viejo and Planchas de Plata projects, located in
northern Sonora, Mexico. A total of 28 reverse-circulation drill holes,
totaling 3,010 meters (9,875 ft), were completed at the two projects.
The recent drilling expanded mineralization encountered at Real Viejo
during an earlier drill program (NR 6-9-04) and was the initial testing
of mineralization at several areas of historic mining at Planchas de
Plata.

Real Viejo

The 22 holes completed at Real Viejo targeted the 600 meter long zone of
mineralized stockworks, originally tested by the Company in the spring
of 2004. The early 2004 drilling consisted of five widely spaced core
holes that intersected multiple zones of silver mineralization.
Intercepts from this program were reported in the Company's news release
dated September 6, 2004 and included 27.5 meters averaging 158.7 grams
per ton("gpt") silver ("Ag") (4.6 ounces per ton silver over 90.2 feet),
including 634 gpt over 1.3 meters.

The follow-up reverse-circulation drill program was designed to offset
previous intercepts and test several additional sub-parallel zones. Of
the 22 holes completed, 20 holes intersected significant silver
mineralization, often with associated base metal (copper, lead, zinc)
mineralization. Of note is drill hole RV04-8, which was drilled
approximately 80 meters west of hole RV04-4C, one of the initial core
holes containing high grade silver mineralization. Drill hole RV04-8
contained five 1.5 meter intervals grading higher than 1000 gpt Ag
including the interval from 97.5 to 99 meters that assayed 2,640 gpt (77
ounces per ton silver over 5 feet). These intervals occurred within
several wider zones of mineralization including from the surface to 7.6
meters that averaged 370.3 gpt Ag over 7.6 meters (10.8 ounces per ton
silver over 25 feet) and from 25.9 to 117.4 meters that averaged 211.4
gpt Ag over 91.5 meters (6.17 ounces per ton silver over 300 feet). A
summary of drill intercepts from the 22 holes is shown in the
accompanying Table 1 and is available on Minefinders' website
(www.minefinders.com).

The drilling confirmed the continuity of the zone as well as identified
higher-grade portions. Drill hole RV04-7, drilled in the east central
portion of the zone, intersected a previously-unidentified, large,
concealed rhyolite plug that may be directly associated with
mineralization and be the reason for the higher-grade intercepts found
in holes RV04-8, RV04-5, RV04-1, and RV04-13/RV04-4C. Future geologic
mapping and cross sectional interpretation will focus on understanding
the controls to high-grade mineralization in order to guide further
drilling.

Planchas de Plata

At the Planchas de Plata project, a total of six holes were completed
within two areas of historic mining. The drilling twinned four historic
drill holes completed in the early 1970s (data released in news release
dated January 12, 2005) and tested for the presence of inferred feeder
structures. The drill results confirm the presence of high-grade silver
mineralization along northeast-trending feeder structures and indicate
that previously-identified lower-grade zones may have been a result of
downhole contamination related to the percussion drilling procedures
utilized in the 1970s program. All holes that intersected the inferred
feeder structures returned significant silver values including hole
PP05-4, which returned 21.4 meters averaging 167.8 gpt Ag from 19.8 to
41.2 meters (4.89 ounces per ton silver over 70 feet). This interval
included 975 gpt Ag over 1.5 meters (28.44 ounces per ton silver over 5
feet). A summary of drill intercepts from the six holes is shown in the
accompanying Table and is available on Minefinders' website
(www.minefinders.com).

Minefinders is currently contracting a drill rig to continue exploration
of the Planchas de Plata and Real Viejo projects. New drilling at
Planchas de Plata is expected to target three additional areas of
historic mining as well as test the extensions of major feeder
structures. Geologic mapping and sampling at Planchas de Plata is
continuing to identify and extend mineralized structures beyond areas of
historic mining and drilling. In addition, existing drilling has only
been completed to shallow depths, leaving significant untested potential
at depth. Drill data from Real Viejo is currently being compiled and
interpreted. Additional drilling is anticipated to extend the high-grade
mineralization and test structural intersections.

Minefinders' Northern Sonora Concessions encompass much of a major,
regional, northwest mineralized trend. This trend contains the Real
Viejo and Planchas de Plata silver properties as well as the Company's
La Bolsa gold-silver deposit. The Company has made a significant
exploration investment in these concessions with a view to realizing the
substantial capital and operating cost benefits that should be possible
from their joint development.

Drill samples, weighing between 5 kg and 15 kg each, were collected and
transported from the Real Viejo and Planchas de Plata sites for assay by
ALS-Chemex Labs of Vancouver, B.C. Standards are inserted into the
sample stream for quality control and a duplicate sample is maintained
at the project site for check assay and metallurgical testing.
Reverse-circulation drilling was conducted by Layne de Mexico based in
Hermosillo Sonora.

Mark H. Bailey, MSc., P.Geo., a Qualified Person as defined by National
Instrument 43-101, has overall responsibility for the Company's mineral
exploration programs and supervised the preparation of the technical
information in this news release.

MINEFINDERS CORPORATION LTD.

Mark H. Bailey

President and Chief Executive Officer

All resource estimates referred to in this disclosure are calculated in
accordance with the Canadian National Instrument 43-101 and the Canadian
Institute of Mining and Metallurgy Classification system. These
standards differ significantly from the requirements of the United
States Securities and Exchange Commission, and resource information
reported in this disclosure may not be comparable to similar information
reported by United States Companies. The terms "Resource(s)" does not
equate to "reserves" and normally may not be included in documents filed
with the Securities and Exchange Commission.

Safe Harbor Statement under the United States Private Securities
Litigation Act of 1995: Statements in this release that are
forward-looking, including statements relating to the size, and growth
in size, of Minefinders' mineral resources and the timing of the further
exploration and development of its exploration projects, are subject to
various risks and uncertainties concerning the specific factors
identified above and in the company's periodic filings with the Ontario
Securities Commission and the U. S. Securities Exchange Commission. Such
information contained herein represents management's best judgment as of
the date hereof based on information currently available. Minefinders
does not intend to update this information and disclaims any legal
liability to the contrary.

 
  
 Table: 1 Real Viejo Drilling 2004 Results 
  
            From    To    Width 
 Drill       me-   me-  me-          Silver     Pb   Zn    Cu 
 hole       ters  ters ters feet   g/t  oz/t   ppm  ppm   ppm 
 RV04-1        0  13.7 13.7   45    49  1.43  2885  529   424 
  
 RV04-2      3.1  10.7  7.6   25  15.2  0.44   792 5637    68 
  
 RV04-3     18.3  22.9  4.6   15  12.7  0.37   810 2052    74 
  and       44.2  47.2    3   10  16.6  0.48  1494  657   124 
  and       57.9  59.4  1.5    5  88.3  2.58  3710  158   509 
  
 RV04-4        0   6.1  6.1   20  19.4  0.57  1775  750   151 
  
 RV04-5        0    29   29   95    50  1.46  2752  649   413 
  and       50.3  74.7 24.4   80    52  1.52  3048 2294   398 
  and      100.6 102.1  1.5    5  67.5  1.97  4330  698  2280 
  
 RV04-7     27.5  30.5    3   10    22  0.64  1098  449   191 
  and       47.2  57.9 10.7   35  25.4  0.74  2398  925   132 
  and       70.1  79.2  9.1   30  19.9  0.58  1813  978    57 
  and       82.3  86.9  4.6   15  18.9  0.55  6600 1183    38 
  
 RV04-8        0   7.6  7.6   25 370.3 10.80  1837  650  1343 
  including  1.5     3  1.5    5  1605 46.81  5100  595  5720 
  
  and       25.9 117.4 91.5  300 211.4  6.17  9495  745  1213 
  including 88.4 105.2 16.8   55 651.1 18.99 12791  828  3754 
  including 97.5    99  1.5    5  2640 77.00 68200  665 11000 
  
 RV04-8A     9.2  12.2    3   10  21.4  0.62  3895  789   260 
  
 RV04-10     3.1   4.6  1.5    5  46.8  1.36  1945  775   208 
  and       18.3  25.9  7.6   25  21.9  0.64   607  367   151 
  
 RV04-11    12.2  27.4 15.2   50  30.4  0.89  2323  837   414 
  and       38.1  39.6  1.5    5   331  9.65   312  525  1365 
  and       74.7  77.7    3   10  58.3  1.70  2390 1295   291 
  
 RV04-12     6.1  10.7  4.6   15  48.5  1.41  1195  547   451 
  and       19.8  24.4  4.6   15  25.8  0.75  1020 1226   220 
  and       39.6  51.8 12.2   40  49.4  1.44  2139 2510   254 
  and       82.3  83.8  1.5    5  58.6  1.71  1395 3310   575 
  
 RV04-13    19.8  30.5 10.7   35 150.1  4.38  8600 1574  1241  Twin of 
                                                               RV04-4C 
  including 21.3  24.3    3   10 258.5  7.54 17830 1047  1908 
  
  and       73.2    93 19.8   65  70.3  2.05  2595  680   500 
  including 77.7  82.3  4.6   15 124.6  3.63  1502  705   816 
  
 RV04-14    19.8    32 12.2   40  14.9  0.43   937 1533    86 
  
 RV04-15       0  18.3 18.3   60  12.3  0.36  2143 2053    80 
  and       35.1  36.6  1.5    5  81.9  2.39 33700 7780   229 
  and       65.5  68.5    3   10 126.1  3.68 14860 2188   678 
  and       86.9  89.9    3   10  30.5  0.89  3375 2185   110 
  
 RV04-16       0  25.9 25.9   85  23.7  0.69  3490  760   122 Includes 
                                                              3 m mine 
                                                               working 
  including 13.7  15.2  1.5    5  95.3  2.78  6300  806   116 
  
 RV04-17       0   6.1  6.1   20  28.3  0.83  2185 1018   216 
  and       13.7  33.5 19.8   65  91.1  2.66  4094 1220   428 Includes 
                                                              3 m mine 
                                                               working 
  including 15.2  19.8  4.6   15 256.2  7.47  9730  802   428 
  
  and       71.6  77.7  6.1   20  37.8  1.10  2590  410   134 
  
 RV04-18    38.1  39.6  1.5    5  76.9  2.24  5960 1170   990 
  and      144.8 149.4  4.6   15  28.4  0.83  2112 1622   141 
  and      163.1 172.2  9.1   30  32.9  0.96  1923  803   204 
  
 RV04-19    99.1 105.2  6.1   20  19.7  0.57   987 1004    66 
   
 RV05-20      32    35    3   10  46.9  1.37  6230 9435   175 
  
 RV05-21       0   4.6  4.6   15  12.8  0.37  2017  603    85 
  
  
 Planchas de Plata Drilling 2005 Results 
  
            From    To    Width 
 Drill       me-   me-  me-          Silver     Pb   Zn    Cu 
 hole       ters  ters ters feet   g/t  oz/t   ppm  ppm   ppm 
 PP05-1      3.1  18.3 15.2   50 114.3  3.33   106  378   199 
  including  7.6  15.2  7.6   25 191.4  5.58   147  403   339 
  
 PP05-2     30.5    32  1.5    5  43.7  1.27    40  259    44 
  
 PP05-4     19.8  41.2 21.4   70 167.8  4.89   976  464   885 
  including 33.5    35  1.5    5   975 28.44   481  328  7040 
  
 PP05-5     12.2  15.2    3   10  47.2  1.38   951  347   174 
  and       38.1  45.7  7.6   25 249.3  7.27  1400  455  1553 
  including 39.6  42.6    3   10 540.5 15.76  2580  549  3645 
  
 PP05-6        0   1.5  1.5    5  69.6  2.03   282  221   122 
  
 

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FOR FURTHER INFORMATION PLEASE CONTACT:
Minefinders Corporation Ltd.
Mark H. Bailey
President and Chief Executive Officer
1 [phone]
[phone] (FAX)
www.minefinders.com