Exhibit 99.12

CONSENT OF EXPERT

To:	United States Securities and Exchange Commission Washington, D.C. 20549
	Alberta Securities Commission
	British Columbia Securities Commission
	Manitoba Securities Commission
	Ontario Securities Commission
	Autorité des marchés financiers
	New Brunswick Securities Commission
	Northwest Territories Registrar of Securities
	Nova Scotia Securities Commission
	Nunavut Registrar of Securities
	Prince Edward Island Securities Office
	Saskatchewan Financial Services Commission
	Securities Commission of Newfoundland and Labrador
	Yukon Registrar of Securitie Rio Alto Mining Limited

Ladies and Gentlemen:

Re: Technical report entitled “La Arena Project, Peru”, effective December 31st, 2014 (the “Report” prepared for Rio Alto Mining Limited (the “Company")

I, Ian Dreyer, do hereby confirm that I am a qualified person under National Instrument 43-101 and a co-author of the Report.

The undersigned, for himself, pursuant to Section 8.3 of National Instrument 43-101 Standards of Disclosure for Mineral Projects confirms that this letter is being filed as the consent to the use of extracts from, or summaries of, the Report in the Company's Annual Information Form for the fiscal year ended December 31, 2014 (the "AIF") and to being named in the AIF.

The undersigned further acknowledges that the AIF will be filed with the United States Securities and Exchange Commission as an Exhibit to the Company's Annual Report on Form 40-F for the fiscal year ended December 31, 2014 (the "Form 40-F"), and consents to being named in the Form 40-F and authorizes the use of the information represented therein relating to the Report.

DATED the 13^rd day of March 2015

By:	/s/ Mr. Ian Dreyer
	Name: Mr. Ian Dreyer, B.App.Sc (MAUSIMM,CP)
	Company: Rio Alto Mining Limited
	Title: Corporate Development Geologist