Filed by Yamana Gold Inc.

pursuant to Rule 425 under the Securities Act of 1933

Subject Company: Meridian Gold Inc.

Commission File Number: 333-146361

Date: October 18, 2007

 

GRAPHIC

 

 

2007 Exploration Overview Darcy Marud, Senior Vice President, Exploration

 


GRAPHIC

 El Peñón La Pepa Mercedes Others Yamana Exploration Chile, North America, Mexico, Peru

 


GRAPHIC

Leveraging Successful Exploration • Americas focus • 2007 exploration budget of $30 million • 65 geologists and liberal drill use Rossi 40 % Meridian 60 % Barrick Gold El Peñ ó n 100 % Meridian Esquel 100 % Meridian Mercedes 100 % Meridian Minera Florida 100 % Meridian Jeronimo 56 . 7 % Meridian 43 . 3 % CODELCO Multiple Nevada Exploration Projects Millo 70 % Meridian 30 % S outhwestern Resources Huxter Lane ~ 0 - 7 0 % Meridian ~ 100 - 30 % Paragon Minerals Amaca 100 % Meridian Amancaya 100 % Meridian La Pepa 100 % Meridian La Silla 100 % Meridian La Espera 100 % Meridian - Production - Development - Exploration Bonsuccesso 100 % Meridian Meridian Meridian Meridian

 


Exploration Team Sr. VP Exploration Darcy Marud Director Exploration South America Nibaldo Rojas Senior Geologist Mexico Mark Hawksworth Senior Geologist Resources & Reserves Greg Walker Senior Geologist Opportunities Robert Wheatley Exploration Manager Peru Rolando Ligardo Exploration Manager Brazil Franyo Zapatta Exploration Manager Chile-Argentina Nibaldo Rojas Senior Geologist Mercedes Project Alejandro Ramos Exploration Manager Minera Florida Marcelo Araya Exploration Manager El Penon Chrisian Cubelli Exploration Manager Nevada John Pierson Project Geologist Advanced Projects Miguel Perez Project Geologists Project Geologists Project Geologists In total, there are 65 professional geologists working on exploration; 41 are in Chile. VP Exploration Evandro Cintra

 


2007 Exploration Budget Summary $31.4 TOTAL $3.1 Admin $5.7 Recon work $8.6 Other Projects $6.5 Mercedes $7.5 El Penon (Other projects include Jeronimo, Millo, La Pepa, Amancaya and Esquel.) For 2008, the exploration budget is expected to increase.

 


1996 2.4 million GEO (1) The Evolution of El Peñón Core Area of 40 sq km 2001 4.5 million GEO (1) 2006 8.5 million GEO (1) (2) El Peñón continues to grow. New high grade nucleus discovered in NE of core area. 2007 should be largest reserves and resource on record.

 


El Peñón Discoveries - Bonanza New discovery made in Q3 2007. Currently 800 meters of strike length and open in all directions.

 


El Peñón Discoveries – Al Este Traced along 3 kilometers of strike length and open in all directions. Resource to reserve conversion ongoing. High grades that can be easily accessed via Martillo Flats

 


Bonanza Vein 2007 discovery assays Al Este Norte 2007 assay results Nucleus of High Grade Mineralization Hole From To Hz. Width Au Ag Aueq (m) (m) (m) (g/t) (g/t) (g/t) SAE0018 373 374 0.52 36.60 112.0 38.64 SAE0019 347 349 1.13 5.80 204.1 9.51 SBE0009 398 405 3.62 15.02 116.8 17.14 SBE0010 376 383 2.95 210.81 411.1 218.28 SBE0012 449 450 0.39 5.70 253.0 10.30 SBE0013 357 361 1.94 39.41 230.2 43.60 SBE0014 396 402 2.64 16.40 265.2 21.22 SBE0015 373 375 0.91 3.48 67.7 4.71 SBE0017 421 446 10.11 21.19 127.4 23.51 Hole From (m) To (m) Hz. Width (m) Au (g/t) Ag (g/t) SPA-0105 355 357 0.92 18.45 755.5 SPA-0119 407 408 0.35 2.43 131.0 SPA-0126 396 397 0.5 34.10 1522.0 SAE-0002 412 413 0.52 9.00 367.0

 


Historical Resources at El Peñón Gold Resources (M ozs) Silver Resources (M ozs) Gold and silver resources have more than tripled in the past 10 years with the highest growth occurring over the past 4 years. 0 50 100 150 200 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Est Ag Ounces (M) AU Ozs (M) 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Est

 


Additional Potential for Discovery AL ESTE SUR PROYECTO FORTUNA ANGOSTA NORTE Bloque Peñon Bloque Norte DISTRICT EXPLORATION

 


Paleocene Regional - Amancaya 100% Meridian Located 120 kilometers south of El Peñón Grassroots discovery made in 2004 Same style and age of mineralization as El Peñón. Caracoles Faride Spence Copucha San Cristobal La Escondida Zaldivar El Tesoro Lomas Bayas El Soldado Cachinal de la Sierra Guanaco Inesperada Vaquillas Sierra Juncal Sierra Overa Chuquicamata Distrito de Cu Distrito de Au Rocas intrusivas Distrito de Ag Rocas volcánicas Franja del Paleoceno-Eoceno Peñón Amancaya

 


Paleocene Regional - Amancaya Six main vein trends with >10 kilometers of strike length 202 drill holes completed to date Infill drilling of current Veta Central resource to be commenced Q2 -2008

 


La Pepa 100% Meridian Located in prolific Maricunga belt Easily accessed from Copiapo, III Region 4,100 meter elevation Past production Proyecto La Pepa

 


La Pepa Miocene aged gold enriched porphyry. Minor oxidation, predominantly sulfide.


La Pepa 37,000 meters of drilling completed. Multi-million ounce gold potential identified. Infill drilling to commence in Q4 2007. Average grade of modeled solid is 0.80 g/t Au.

 


248 km south of Tucson, Arizona 254 km north of Hermosillo, Sonora Paved roads to within 10 km of Mercedes Mine Strong mining culture in area (50 km south of Cananea Copper Mine) Mercedes Project - Location

 


 Mercedes Project - Land Position Approximately 70,000 hectares; 100% controlled by Yamana Key vein areas on private ranch (covered by lease to purchase agreement).

 


 Three major vein sub-districts identified within andesite basins. All contain multiple epithermal vein targets with drill and/or surface Au-Ag mineralization. A total of 13km cumulative strike length of veins identified in property area. Mercedes Project - Target Overview

 


Mercedes Vein

 


Mercedes Vein: Key Intercepts (2.0 g/t AuEq cutoff) 57 5.57 8.0 5.52 10.20 26.37 473.70 447.33 2.00 C. de Oro M07-130 103 49.95 212.7 48.53 2.06 2.35 303.89 301.54 2.00 Centinela M07-126 62 15.96 98.1 15.31 3.90 7.93 309.37 301.44 2.00 C. de Oro M07-125 48 5.35 31.3 5.14 8.95 16.28 422.38 406.10 2.00 C.de Oro M07-122 338 161.12 574.0 157.29 2.10 2.30 255.84 253.54 2.00 Centinela M07-107 111 27.76 397.3 25.11 4.00 5.89 256.25 250.36 2.00 C.de Oro M07-092 229 35.30 181.0 34.09 6.50 16.10 260.60 244.50 2.00 C. de Oro M07-091 104 13.04 116.0 12.27 8.00 20.35 212.75 192.40 2.00 C. de Oro M07-089 52 11.53 129.2 10.67 4.52 9.14 342.90 333.76 2.00 C.de Oro M07-081 146 28.17 214.0 26.74 5.20 9.56 222.40 212.84 2.00 C.de Oro M07-080 98 6.85 105.8 6.14 14.31 33.40 307.25 273.85 2.00 C.de Oro M06-053 674 64.19 778.9 59.00 10.50 17.85 229.35 211.50 2.00 C.de Oro M06-044 97 5.63 103.0 4.94 17.25 40.65 228.70 188.05 2.00 C. de Oro M05-035 271 30.07 245.0 28.44 9.00 21.00 207.00 186.00 2.00 C.de Oro M05-031 56 12.25 97.1 11.60 4.57 6.00 96.00 90.00 2.00 C.de Oro M05-030 69 45.95 506.1 42.58 1.50 2.28 170.73 168.45 2.00 Casa Blanca M007 43 6.10 114.2 5.34 7.00 14.54 186.74 172.20 2.00 C.de Oro M001 AuEq gm (150:1) g/t g/t (m) (m) (m) (m) (g/t AuEq)     G x T AuEq Ag Au True Width Interval To From Cutoff Vein Hole

 


Mercedes Vein Grade x Thickness Long Section

 


Klondike Vein

 


Klondike Vein: Key Intercepts (0.5 g/t AuEq cutoff) 26 2.65 32.0 2.44 9.83 11.17 98.04 86.87 0.5 K07-051 38 3.48 59.5 3.08 11.00 14.10 239.65 225.55 0.5 K07-044 225 4.09 31.5 3.88 55.07 70.76 215.86 145.10 0.5 K07-043 92 15.25 38.8 14.99 6.02 8.60 237.20 228.60 0.5 K07-035 33 1.36 23.7 1.20 24.00 36.14 164.16 128.02 0.5 K07-034 17 1.36 18.0 1.24 12.50 18.24 147.80 129.56 0.5 K07-033 37 1.41 15.0 1.31 26.00 30.48 222.50 192.02 0.5 K07-028 66 2.71 17.0 2.60 24.33 27.03 145.90 118.87 0.5 K07-027 162 24.18 26.0 24.01 6.70 7.17 94.95 87.78 0.5 K07-024 30 2.03 18.0 1.91 15.00 24.72 133.64 108.92 0.5 K07-022 53 3.11 16.0 3.00 17.00 19.01 90.96 71.95 0.5 K07-020 48 1.49 22.0 1.34 32.00 34.55 72.14 37.59 0.5 K06-016 106 2.71 20.0 2.58 39.00 42.67 127.00 84.33 0.5 K06-015 36 1.08 44.0 0.79 33.48 51.07 203.51 152.44 0.5 K007rc-b 102 4.02 21.0 3.88 25.40 33.54 152.44 118.90 0.5 K003 AuEq gm (150:1) g/t g/t (m) (m) (m) (m) (g/t AuEq)   G x T AuEq Ag Au True Width Interval To From Cutoff Hole

 


Klondike Grade x Thickness Long Section

 


Rey de Oro Vein

 


70/30 JV with Southwestern Gold High grade potential identified on Pintapata veins Drilling currently underway. Millo

 


Millo 30° 72° 13° 42° ? ? ? ? 81° 61° 60° 76° 81° 80° 75° 76° 68° ? ? ? 65° 72° 23° ? 75° 75° 58¦ 65° 55° 60° 85¦ 44° 55° 45° 70° 14° 5° 12° 84° 72° 85° 75° 18° 85° 40° 40° 57° 48° 5° 40° 24° 70° 10° 24° 50° 71° 85° 85° 75° 30° 86° 80° 57° 30° 84° 10° 15° 39° 10° 71° 60° 45° 30° 20° 60° 52° 52° 24° 10° 41° Q XI XIa IX X VETA ESPAÑOLA VETA PERUANITA Xa XVIII VETAS COLONIAL VETA SILVERIA IXa 770000 mE 770200 mE 770200 mE 8387200 mN 8387400 mN 8387600 mN 8387600 mN 770000 mE 769800 mE 769800 mE 8387200 mN 8387400 mN 32.6m@1.4g/tAu-78g/tAg-3.0g/tAu.Eq. 1.2m@10g/tAu-967g/tAg-29.3g/tAuEg. 8.9m@0.6g/tAu-119g/tAg-3.0g/tAu.Eq. 13.8m@1.1g/tAu-120g/tAg-3.5g/tAu.Eq. 8.5m@111g/tAu-305g/tAg-117g/tAu.Eq. 0 50 100 meters Sondajes Proyectados Sondajes Realizados Carretera Vetas PTT004 PTT002 PTT007 PTT001 PTT003 PTT 005 PTT 013 PTT 018 PTT 017 PTT 014 PTT 015 PTT 016

 


Alhue - Location

 


Minera Florida Significant Growth Prospects In a very short time period since purchasing Minera Florida, Meridian’s exploration activities have resulted in the discovery of new veins and expansion of the resource base Exploration on this property is still very early stage; many targets and prospective areas remain to be explored Area of Prospectivity Area of Prospectivity 2005

 


MINAS DE PLATA 1.200.000 5.0 80 1.80 MAQUIS NORTE AGUA FRIA CENTENARIO 1.390.000 6.1 35 1.34 LAS ANIMAS 1.100.000 5.7 21 1.19 SIMON BOLIVAR 1.000.000 5.3 10 1.14 LOS PATOS MAQUIS SUR Mt Au(g/t) Ag(g/t) Zn(%) Potential Alhue 300.000 4.5 100 0.80 300.000 5.5 50 1.00 980.000 6.1 33 1.47 400.000 4.3 100 1.50 RESGUARDO 1.000.000 5.3 30 1.20

 


Consolidation of Alhue/Membrillo/Chancon Districts Meridian has consolidated the Membrillo, Chancon and Alhue districts Doubles Meridian’s land holdings in the area of Minera Florida Combined, the districts have produced more than 2 million ounces of gold and currently there are at least three active mines in the area