Minefinders Receives Final Audited Resource for Dolores Feasibility Study.

VANCOUVER, British Columbia -- Minefinders Corporation Ltd. (the "Company") (AMEX:MFN) (TSX:MFL), Mark H. Bailey, President and CEO, has received the final report from Roscoe Postle Associates Inc. ("RPA") containing RPA's audited resource estimations for the Company's 100% owned Dolores gold and silver project, in Chihuahua, Mexico. The report is a cornerstone of the Dolores bankable feasibility study.

The following table shows the estimated total measured and indicated Dolores mineral resources at various gold equivalent (total gold and gold equivalent silver) ("AuEq") cut-off grades (see also the attached Appendix for separate measured, indicated and inferred resource data). The RPA report will be filed on SEDAR shortly (www.sedar.com) and can also be viewed at that time on the Company's website at www.minefinders.com.

Measured and Indicated Resource

Cut-off Tonnage   Au      Ag    AuEq          Au           Ag
g/t       Kt     g/t     g/t     g/t          oz           oz
-------------------------------------------------------------
5.0    3,743    6.06   229.4    8.82     705,000   26,701,000
4.0    5,458    4.99   199.8    7.40     846,000   33,922,000
3.0    9,058    3.83   160.8    5.78   1,079,000   45,307,000
2.0   17,666    2.68   117.5    4.11   1,471,000   64,567,000
1.5   26,775    2.11    96.0    3.28   1,758,000   79,919,000
1.0   39,463    1.67    77.3    2.61   2,045,000   94,919,000
0.9   42,729    1.58    73.6    2.48   2,101,000   97,863,000
0.8   46,841    1.49    69.5    2.33   2,165,000  101,261,000
0.7   52,343    1.38    64.7    2.17   2,241,000  105,255,000
0.6   60,082    1.25    58.9    1.97   2,330,000  110,106,000
0.5   70,805    1.11    52.7    1.75   2,433,000  115,989,000
0.4   85,272    0.96    46.2    1.53   2,548,000  122,612,000
0.3  101,064    0.84    40.8    1.34   2,647,000  128,179,000

An additional inferred resource of 28 million tonnes at a 0.3g/t AuEq cutoff is also confirmed by the audit (see attached Appendix). RPA reports that the Dolores mineral resource estimates meet the definitions of "measured", "indicated" and "inferred" mineral resources contained in NI 43-101 of the Canadian Securities Administrators and in the CIM Standards on Mineral Resources and Reserves Definitions and Guidelines adopted by the CIM Council as of August 20, 2000.

In October 2004, Minefinders submitted to RPA the final mineral resource estimates for the Dolores deposit that will be used for all economic modeling and engineering studies comprising the Dolores Feasibility Study. The updated, October 2004 resource estimates show modest increases in tonnage, and ounces for all resource categories over those last announced by the Company, in August 2004. In particular, RPA notes that at a 0.3 g/t AuEq cut-off, measured and indicated gold has increased by 4.1% and silver by 6.4%.

The Dolores deposit has now been sufficiently drilled to qualify 98% of the resource material in the area of the projected pit as "measured" or "indicated". As a result, final economic modeling will include nearly all material contained in the 2.5 kilometer long by 800 meter wide planned pit.

Since initiating the infill drilling program in July 2002, the Company has completed over 76,000 meters of additional drilling, primarily for the purposes of the bankable-level verifications required for project financing. Accordingly, the receipt of the RPA report represents a milestone in the development of the Dolores deposit.

Methodology - Resource Estimation

Resource blocks are classed as "measured", "indicated", or "inferred", in accordance with the confidence level of the estimate. Estimates were based upon block models, constrained by 3D wireframe  models, constructed with Gemcom software. Block grade estimation was performed using inverse distance to the fifth power weighting ("ID5"). RPA re-estimated the block grades using Ordinary Krieging as a check of the interpolation method. In RPA's opinion, "the ID5 block model provides a reasonable estimate of mineral resources at Dolores".

Resource classification was determined using the anisotropic distance to the nearest composite. Composites were capped to 30 g/t Au and 1,000 g/t Ag, prior to grade estimation. Blocks within approximately 17.5 m of the nearest composite were assigned to the measured category. Indicated blocks are between 17.5 m and 35 m from a composite; while inferred blocks are between 35 m and 90 m from the nearest composite.

For the purpose of geological modeling and the application of a cut-off grade, Au and Ag grades were rendered into a gold equivalent grade calculated at a gold to silver ratio of 1:75, based on prices of US$300 per ounce of gold and US$5.00 per ounce of silver and metallurgical recoveries of 87.5% for gold and 75% for silver.

Methodology - Fieldwork

Between 1996 and October 2004, Minefinders completed 347 diamond drill core holes (95,366 m) and 218 reverse circulation holes ("RC") (41,704 m) for a total of 137,070 metres. This total includes two lost holes, six holes drilled as water wells or for geotechnical purposes, three twin holes, and 54 holes that tested outlying targets beyond the resource area. RC drill samples were taken every 1.52 metres (5 feet). Diamond drill core sample length was variable, based on lithology and mineralization, but was typically 2 meters in length. The core was split with one-half retained for reference.

Most of the accessible underground historical workings at Dolores were sampled. Over 13,000 surface rock samples were taken, with 9,882 as continuous 5 m samples along road cuts or lines perpendicular to the deposit trend. These samples have been used to project mineralized envelopes to surface but not to interpolate grade into blocks. Sample data was compiled and stored in a Gemcom database that contains records for 565 drill holes (76,217 samples), 28 underground channels (532 samples), and 213 surface chip sample lines (9,439 samples).

Bankable Feasibility Study

The Company has now completed most of the work necessary (infill and condemnation drilling, process metallurgy, geotechnical surveys, environmental surveys, social surveys, resource and mine modeling and detailed engineering) to permit its independent engineers and other consultants to generate accurate operating cost assessments, generate optimized pit shells, design and scale process plant and infrastructure, determine mine equipment lists, and complete the environmental impact and other studies and reports that comprise a bankable level feasibility study.

Final reports have now been received on various components of the bankable feasibility study, including the RPA mineral resource audit, McClelland Laboratories' final report on metallurgical test results, SGS Lakefield's report on flotation mill recoveries and cyanide leach processes in the mill circuit, Golder Associates' report on pit slope stability, and others. All reports support the viability of the planned open-pit mining operation. The final feasibility study will be reported when completed.

About Minefinders

Minefinders is a successful precious metals exploration company, with the advanced Dolores gold and silver deposit in Chihuahua, Mexico and several ongoing exploration projects in Sonora, Mexico and Nevada. The Company is presently completing a bankable feasibility study on the Dolores deposit and conducting exploration drilling programs on its other prospects. Mark H. Bailey, MSc., P.Geo., a "qualified person" as defined by National Instrument 43-101 of the Canadian Securities Administrators, 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 Securities Administrators' 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 the Company's mineral resources and the timing of the further exploration and development of the Dolores Project, 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. The Company does not intend to update this information and disclaims any legal liability to the contrary.

Appendix to Minefinders Corporation Ltd. News Release Dated December 6, 2004

OCTOBER 2004 MINERAL RESOURCES ESTIMATE

Classified mineral resources at a range of cut-off grades are listed below:

Measured Resources

Cut-Off     Tonnage      Au      Ag    AuEq          Au           Ag
g/t AuEq         Kt     g/t     g/t     g/t          oz           oz
--------------------------------------------------------------------
5.0           2,284    6.17   241.1    9.39     438,000   17,126,000
4.0           3,243    5.12   210.7    7.93     516,000   21,254,000
3.0           5,195    3.97   169.9    6.24     641,000   27,452,000
2.0           9,853    2.79   123.3    4.44     855,000   37,787,000
1.5          14,808    2.19   100.3    3.53   1,010,000   46,195,000
1.0          22,238    1.70    79.6    2.76   1,176,000   55,058,000
0.9          24,198    1.61    75.5    2.62   1,210,000   56,825,000
0.8          26,639    1.51    71.1    2.45   1,247,000   58,912,000
0.7          29,639    1.40    66.3    2.28   1,287,000   61,120,000
0.6          33,639    1.27    60.9    2.09   1,332,000   63,719,000
0.5          38,914    1.14    55.1    1.88   1,383,000   66,690,000
0.4          45,899    1.01    49.0    1.66   1,437,000   69,953,000
0.3          53,413    0.89    43.7    1.48 1,485,000 7    2,599,000


Indicated Resources

Cut-Off     Tonnage      Au      Ag    AuEq         Au           Ag
g/t AuEq         Kt     g/t     g/t     g/t         oz           oz
-------------------------------------------------------------------
5.0           1,459    5.89   211.0    8.70    267,000    9,575,000
4.0           2,215    4.80   183.9    7.25    330,000   12,667,000
3.0           3,863    3.64   148.6    5.62    437,000   17,854,000
2.0           7,813    2.54   110.2    4.00    616,000   26,779,000
1.5          11,967    2.01    90.6    3.22    747,000   33,723,000
1.0          17,225    1.62    74.4    2.61    868,000   39,860,000
0.9          18,531    1.55    71.2    2.50    891,000   41,038,000
0.8          20,201    1.46    67.4    2.36    917,000   42,349,000
0.7          22,704    1.35    62.5    2.18    953,000   44,135,000
0.6          26,443    1.21    56.4    1.97    997,000   46,387,000
0.5          31,892    1.06    49.7    1.72  1,050,000   49,299,000
0.4          39,373    0.91    43.0    1.48  1,110,000   52,659,000
0.3          47,652    0.78    37.5    1.28  1,161,000   55,580,000


Measured and Indicated

Cut-Off     Tonnage      Au      Ag    AuEq          Au          Ag
g/t AuEq         Kt     g/t     g/t     g/t          oz          oz
-------------------------------------------------------------------
5.0           3,743    6.06   229.4    8.82     705,000  26,701,000
4.0           5,458    4.99   199.8    7.40     846,000  33,922,000
3.0           9,058    3.83   160.8    5.78   1,079,000  45,307,000
2.0          17,666    2.68 1  17.5    4.11   1,471,000  64,567,000
1.5          26,775    2.11    96.0    3.28   1,758,000  79,919,000
1.0          39,463    1.67    77.3    2.61   2,045,000  94,919,000
0.9          42,729    1.58    73.6    2.48   2,101,000  97,863,000
0.8          46,841    1.49    69.5    2.33   2,165,000 101,261,000
0.7          52,343    1.38    64.7    2.17   2,241,000 105,255,000
0.6          60,082    1.25    58.9    1.97   2,330,000 110,106,000
0.5          70,805    1.11    52.7    1.75   2,433,000 115,989,000
0.4          85,272    0.96    46.2    1.53   2,548,000 122,612,000
0.3         101,064    0.84    40.8    1.34   2,647,000 128,179,000



Inferred Resources

Cut-Off     Tonnage       Au      Ag    AuEq        Au           Ag
g/t AuEq         Kt      g/t     g/t     g/t        oz           oz
-------------------------------------------------------------------
5.0             721     7.41   140.6    9.28   166,000    3,151,000
4.0             998     6.16   133.2    7.94   191,000    4,133,000
3.0           1,589     4.70   117.7    6.27   232,000    5,815,000
2.0           3,303     3.11    86.2    4.25   319,000    8,856,000
1.5           5,364     2.37    69.1    3.29   395,000   11,529,000
1.0           8,724     1.76    55.3    2.49   476,000   15,005,000
0.9           9,643     1.64    52.7    2.35   493,000   15,806,000
0.8          10,710     1.53    50.0    2.20   510,000   16,656,000
0.7          12,282     1.39    46.3    2.01   532,000   17,687,000
0.6          14,665     1.23    41.7    1.79   562,000   19,020,000
0.5          17,908     1.07    37.2    1.57   595,000   20,720,000
0.4          22,223     0.91    32.6    1.35   631,000   22,533,000
0.3          28,089     0.77    28.0    1.14   668,000   24,462,000

Note: Gold equivalence was calculated using a Ag to Au ratio of 75:1
, prices of $300 Au, $5.00 Ag; and recoveries of 87.5% Au and 75% Ag