Rio Alto Mining 6-K Form 51-102F3 Material Change Report

Exhibit 99.1

FORM 51-102F3
MATERIAL CHANGE REPORT

Item 1Name and Address of Company

Rio Alto Mining Limited (“Rio Alto” or the “Company”)
400 Burrard Street
Suite 1950
Vancouver, British Columbia
V6C 3A6

Item 2Date of Material Change

June 12, 2014

Item 3News Release

A press release was disseminated on June 12, 2014 via Marketwired.

Item 4Summary of Material Change

Dr. Roger Norwich resigned from the Board of Directors of the Company.

Item 5Full Description of Material Change

Dr. Roger Norwich resigned from the Board of Directors of the Company for health and personal reasons. Dr. Norwich has been a director of Rio Alto since its inception in June 2009 and most recently served on the Corporate Governance and Compensation Committee and the Audit Committee.

Item 6Reliance on subsection 7.1(2) of National Instrument 51-102

Not applicable.

Item 7Omitted Information

Not applicable.

Item 8Executive Officer

Alexander Black
President, CEO & Director
51 1 625 9900
alexb@rioaltomining.com

Item 9Date of Report

June 19, 2014