Exhibit 99.1

May 25, 2012

Dear McEwen Mining Shareholders,

Please find below the El Gallo Complex development update.

Key development highlights over the past two weeks are:

· Installation of clay foundation and heap leach liner well underway

· Process plant construction nears completion

· Crushing plant construction 70% complete

To view the El Gallo Development Photo Update, please click here.

For further information contact:

Jenya Meshcheryakova

Investor Relations

Tel: (647) 258-0395 ext 410

Toll Free: (866) 441-0690

Fax: (647) 258-0408

Mailing Address

181 Bay Street Suite 4750

Toronto ON M5J 2T3

P.O. Box 792

E-mail: info@mcewenmining.com

If you no longer want to receive announcements from us, please do not reply to this e-mail. Instead simply click here.

MUX El Gallo Complex Development Photo Update May 25, 2012 MCEWEN MINING

2 Applying clay foundation.

3 Installing heap leach liner.

4 Installing heap leach liner.

5 Cutting pipes for heap leach.

6 Diesel generator building for process plant.

7 Installation of process equipment.

8 Diesel storage for process plant.

9 Over 3 million tonnes mined since December.

10 Operating team.

11 Crushing plant assembly.

12 Crushing plant assembly.

13 Crushing plant assembly.

14 Crushing plant assembly.

MUX For further information please contact: Jenya Meshcheryakova Investor Relations Tel: (647) 258-0395 x 410 Toll Free: (866) 441- 0690 Fax: (647) 258-0408 Email: info@mcewenmining.com MCEWEN MINING