CONTACTS

Compañía de Minas Buenaventura S.A.A.   Headquarter Address: Carlos Villaran 790, Santa Catalina, La Victoria   Lima, Peru Telephone: (511) 419-2500 Investor Relations Daniel Dominguez Telephone: (511) 419 2500 E-mail: ir@buenaventura.com.pe Human Resources E-mail: recursos@buenaventura.com.pe Ethics Officer E-mail: funcionarioetica@buenaventura.com.pe Audit Comitee President E-mail: presidentecomiteauditoria@buenaventura.com.pe 5 5

I-Advize Corporate Communications, Inc.   Melanie Carpenter / Pete Majeski Telephone: (212) 406 3690 E-mail: pmajeski@i-advize.com mcarpenter@i-advize.com   5 5

2006 CALENDAR

	Board of Directors and Earnings Release	Conference Call
4Q05	March 2nd	March 3rd
1Q06	April 27th	April 28th
2Q06	July 26th	July 27th
3Q06	Oct 30th	Oct 31st