Minefinders Discovers New Mineralization at La Bolsa

VANCOUVER, BRITISH COLUMBIA, Jul 30 (MARKET WIRE) --
Minefinders Corporation Ltd. (TSX: MFL)(NYSE Amex: MFN) today announced
positive results from the Company's 2009 drill program at their 100
percent owned La Bolsa property located in Sonora, Mexico.

Step-out drilling has encountered a significant new zone of gold and
silver mineralization approximately 200 meters east of the current La
Bolsa resource. These initial drill results confirm the presence of
high-grade gold and silver mineralization including 6.0 meters containing
12.063 gpt Au and 109.8 gpt Ag (19.7 feet with 0.352 opt gold and 3.20
opt Ag), and 20.5 meters containing 2.099 gpt Au with 35.4 gpt Ag (67.3
ft with .061 opt Au and 1.03 opt Ag). Six of the 19 drill holes completed
during the current drill campaign targeted this new area of
mineralization. While these results represent a significant expansion of
the mineralized zone at La Bolsa, additional drilling is required to
assess the extent and full potential of this newly discovered
mineralization. In addition to core drilling in progress, a
reverse-circulation drill rig has been mobilized to site to accelerate
resource definition and expansion efforts.

Assay results from the newly discovered zone are summarized in Table I.
An additional 13 drill holes were drilled both interior and peripheral to
the previously defined mineralized zone and the significant intercepts
from this drilling are summarized in Table II. A map showing the La Bolsa
resource area and the new zone of mineralization is being prepared and,
when complete, will be available to view on the Company's website.

Table I: La Bolsa East Extension Discovery Zone

---------------------------------------------------------------------------
Drill Width Width Aueq
Hole Section Intercept in m in ft Au Ag (2)
No. (m) (m) (1) (1) gpt gpt gpt
---------------------------------------------------------------------------
LB 68C 600 108 to 133 25 44.3 1.888 31.8 2.418
---------------------------------------------------------------------------
includes: 7.25 23.8 4.847 62.4 5.887
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 78C 570 144.4 to 156.1 11.7 38.4 6.411 60.7 7.423
---------------------------------------------------------------------------
Includes: 6.0 19.7 12.063 109.8 13.893
---------------------------------------------------------------------------
And 181.0 to 193.2 12.2 40.0 0.732 5.5 0.824
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 79C 630 103.0 to 109.0 6.0 19.7 0.594 10.5 0.769
---------------------------------------------------------------------------
and: 119.0 to 140.0 21.0 68.9 1.027 7.6 1.254
---------------------------------------------------------------------------
And 157.0 to 166.5 9.5 31.2 0.309 1.8 0.339
---------------------------------------------------------------------------
And 174.0 to 180.0 6.0 19.7 0.585 6.2 0.688
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 80C 615 32.0 32.0 105.0 0.430 8.25 0.568
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 82C 630 186.0 to 198.0 12.0 39.4 1.443 12.4 1.649
---------------------------------------------------------------------------
Includes: 3.05 10.0 3.135 27.4 3.592
---------------------------------------------------------------------------
And 205.5 to 217.5 12.0 39.4 0.756 5.0 0.839
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 83C 660 126.2 to 152.5 26.3 86.3 0.409 4.7 0.487
---------------------------------------------------------------------------
And 172.0 to 178.0 6.0 19.7 0.837 2.6 0.880
---------------------------------------------------------------------------

(1) Drill widths are down hole intercepts and may not be true widths
(2) "Aueq" is gold and gold equivalent silver. Aueq grades are based on
a 60:1 silver to gold ratio.

Table II: 2008-2009 Additional Significant Intercepts:

---------------------------------------------------------------------------
Drill Width Width Aueq
Hole Section Intercept in m in ft Au Ag (2)
No. (m) (m) (1) (1) gpt gpt gpt
---------------------------------------------------------------------------
LB 66C 510 79.5 to 93.0 mm 13.5 44.3 0.618 14.8 0.864
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 69C 480-495 15.0 to 34.5 19.5 64.0 0.667 8.74 0.813
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 70C 390 20.5 to 37.0 16.5 54.1 0.959 7.2 1.079
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 71C 330 23.5 to 39.5 16.0 52.5 0.926 5.2 1.012
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 72C 555-570 75.0 to 114.5 39.5 129.6 1.033 24.1 1.435
---------------------------------------------------------------------------
Includes: 16.7 54.8 1.487 29.0 1.970
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 73C 630 6.5 to 24.8 18.3 60.0 0.524 4.5 0.599
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 81C 675-690 85.15 to 100.75 15.6 51.2 0.715 2.3 0.753
---------------------------------------------------------------------------
---------------------------------------------------------------------------
LB 84C 495 112.4 to 121.85 9.45 31.0 0.935 8.3 1.073
---------------------------------------------------------------------------

(1) Drill widths are down hole intercepts and may not be true widths
(2) "Aueq" is gold and gold equivalent silver. Aueq grades are based on
a 60:1 silver to gold ratio.

Drilling results from the 162 drill holes (78 reverse-circulation
holes and 84 core holes) completed to date at the La Bolsa property will
be incorporated into an updated resource model and reported in a National
Instrument 43-101 compliant technical report expected to be filed during
the third quarter of this year. This will be the first NI 43-101
compliant resource for the La Bolsa property. The previous La Bolsa
resource, reported by the Company on September 15, 1999 (prior to the
establishment of Canada's mineral disclosure guidelines under NI 43-101),
estimated 6.0 million tonnes grading 1.0 grams per tonne gold ("gpt") and
10 gpt silver in the inferred category, based on results from the initial
72 drill holes.

Gold mineralization at La Bolsa occurs within a shallow east-dipping
oxidized blanket that is subparallel to topography and approximately 900
meters (3,000 feet) in length and 365 meters (1,200 feet) in width with
thicknesses that range from 10 to 50 meters (30 to 165 feet). The recent
drilling at La Bolsa has now extended that zone to nearly 600 meters
(2,000 feet of width) and this mineralization remains open both down-dip
and along strike.

Minefinders has also commenced a pre-feasibility study of the economic
viability of a mine at the La Bolsa property and expects to have results
available in another NI 43-101 compliant technical report by the end of
this year. The updated resource will be used as the basis for
construction of a reserve block model to be used in the study. The
shallow dip of the majority of mineralization in close proximity to the
surface and favorable metallurgical characteristics (see news release
dated May 21, 2009) suggests a mine plan that will incorporate low-cost
open-pit mining in combination with simple heap-leach recovery of gold
and silver.

Quality Control and Assurance

All analyses used for resource assessment are fire assay analyses for
gold and multi-acid digestion with AA analyses or fire assay analyses for
silver, and have been completed by either Chemex Labs of Vancouver,
Canada or Inspectorate Labs of Sparks, Nevada. Samples from drill
intervals were comprised of either HQ or NQ core, or down-hole reverse
circulation rock chips, all representatively split prior to analysis and
transported by the labs to sample preparatory facilities in Hermosillo,
Mexico (Chemex) or Durango, Mexico (Inspectorate).

Mark Bailey MSc., P.Geo. is the "qualified person" with overall
responsibility for the La Bolsa project and is responsible for the
contents of this news release. About Minefinders

Minefinders is a precious metals mining and exploration company and
operates the multi-million ounce Dolores gold and silver mine in Mexico.
The Company continues its exploration efforts on other prospective
projects in Mexico to build a quality pipeline of precious metals
projects for future growth.

Forward Looking Statements

This release contains certain "forward-looking statements" and
"forward-looking information" as defined under applicable Canadian and
U.S. securities laws. Forward-looking statements generally can be
identified by the use of forward-looking terminology such as "may",
"will", "expect", "intend", "estimate", "anticipate", "believe",
"continue" or similar terminology. Forward-looking statements are based
on forecasts of future results, estimates of amounts not yet determinable
and assumptions that, while believed by management to be reasonable, are
inherently subject to significant business, economic and competitive
uncertainties and contingencies. Certain of the statements made herein by
Minefinders are forward-looking and subject to important risk factors and
uncertainties, both known and unknown, many of which are beyond the
Company's ability to control or predict. Known and unknown factors could
cause actual results to differ materially from those projected in the
forward-looking statements. Those factors are described or referred to
under the heading "Risk Factors" of Minefinders' Annual Information Form
for the year ended December 31, 2008 and under the heading "Risks and
Uncertainties" of Minefinders' Management's Discussion and Analysis for
the year ended December 31, 2008 and quarter ended March 31, 2009, which
are incorporated by reference herein and are available on SEDAR at
www.sedar.com. Although the Company has attempted to identify important
factors that could cause actual actions, events or results to differ
materially from those described in forward-looking statements, there may
be other factors that cause actions, events or results not to be as
anticipated, estimated or intended. There can be no assurance that
forward-looking statements will prove to be accurate, as actual results
and future events could differ materially from those anticipated in such
statements.

Contacts:
Minefinders Corporation Ltd.
Mike Wills
Investor Contact
(604) 687-6263
(604) 687-6267 (FAX)
mike@minefinders.com
www.minefinders.com

Copyright 2009, Market Wire, All rights reserved.

-0-