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NI 43-101 TECHNICAL REPORT on the YAURICOCHA MINE Yauyos Province, Peru

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NI 43-101 TECHNICAL REPORT on the YAURICOCHA MINE Yauyos Province, Peru NI 43-101 TECHNICAL REPORT ON THE YAURICOCHA MINE Yauyos Province, Peru PREPARED FOR Sierra Metals, Inc. 595 Burrard Street, Suite 3083 PO Box 49298, Vancouver, BC Canada V7X 1L3 Effective Date: December 31, 2014 Report Date: May 11, 2015 PREPARED BY Donald E. Hulse, P.E., SME-RM Thomas C. Matthews, MMSA-QP Deepak Malhotra, PhD, SME-RM Sierra Metals, Inc. Certificate of Author Forms Yauricocha Mine NI 43-101 Technical Report DONALD E. HULSE, P.E. Principal Mining Engineer Gustavson Associates, LLC 274 Union Boulevard, Suite 450 Lakewood, Colorado 80228 Telephone: 720-407-4062 Facsimile: 720-407-4067 Email: [email protected] CERTIFICATE of AUTHOR I, Donald E. Hulse do hereby certify that: 1. I am currently employed as Vice President and Principal Mining Engineer by Gustavson Associates, LLC at: 274 Union Boulevard Suite 450 Lakewood, Colorado 80228 2. I am a graduate of the Colorado School of Mines with a Bachelor of Science in Mining Engineering (1982), and have practiced my profession continuously since 1983. 3. I am a registered Professional Engineer in the State of Colorado (35269). I am also a Registered Member of the Society of Mining, Metallurgy and Exploration (1533190RM). 4. I have worked as a mining engineer for a total of 30 years since my graduation from university; as an employee of a major mining company, a major engineering company, and as a consulting engineer. I have performed resource estimation and mine planning on over 30 gold deposits for over 11 mining companies in three countries working as a consultant as well as an engineer or engineering manager for the projects 5. I have read the definition of “qualified person” set out in National Instrument 43-101 (“NI 43-101”) and certify that by reason of my education, affiliation with a professional association (as defined in NI 43-101) and past relevant work experience, I fulfill the requirements to be a “qualified person” for the purposes of NI 43-101. 6. I am responsible for Sections 1 through 6, 15, 16 and 18 through 27 of the technical report entitled “NI 43-101 Technical Report on the Yauricocha Mine, Yauyos Province, Peru,” dated May 11, 2015, with an effective date of December 31, 2014, (the “Technical Report”), and am also responsible for the overall organization and content of the document. I visited the project site April 10, 2012 for three days, March 21-24, 2011 and most recently September 29 to October 4, 2013. 7. I prepared a previous report on the Yauricocha property, “NI 43-101 Technical Report on the Yauricocha Project, Yauyos Peru” dated May 25, 2011. I was responsible for Sections 1 through 12, 14, 17.1.5, 17.24, 17.23, 20, and 23 through 27 of the technical report entitled “NI 43-101 Technical Report on the Yauricocha Mine, Yauyos Province, Peru”, dated October 19, 2012, with an effective date of October 10, 2012, and was also responsible for the overall organization and content of the document. I was responsible May 11, 2015 i Sierra Metals, Inc. Certificate of Author Forms Yauricocha Mine NI 43-101 Technical Report for Sections 1 through 6, 15, 16 and 18 through 27 of the technical report entitled “NI 43- 101 Technical Report on the Yauricocha Mine, Yauyos Province, Peru,” dated November 15, 2013, with an effective date of October 1, 2013 and was also responsible for the overall organization and content of the document. 8. I am independent of the issuer applying all of the tests in Section 1.5 of National Instrument 43-101. 9. I have read National Instrument 43-101 and Form 43-101, and the Technical Report has been prepared in compliance with that instrument and form. 10. I consent to the filing of the Technical Report with any stock exchange and other regulatory authority and any publication by them for regulatory purposes, including electronic publication in the public company files on their websites accessible by the public, of the Technical Report. 11. As of the date of this certificate, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. Dated this 11th day of May, 2015 /s/ Donald E. Hulse Signature of Qualified Person Donald E. Hulse Printed Name of Qualified Person May 11, 2015 ii Sierra Metals, Inc. Certificate of Author Forms Yauricocha Mine NI 43-101 Technical Report THOMAS C. MATTHEWS Principal Resource Geologist Gustavson Associates, LLC 274 Union Boulevard, Suite 450 Lakewood, Colorado 80228 Telephone: 720-407-4062 Facsimile: 720-407-4067 Email: [email protected] CERTIFICATE of AUTHOR I, Thomas C. Matthews, B.Sc. do hereby certify that: 1. I am currently employed as Senior Resource Geologist at: Gustavson Associates, LLC 274 Union Boulevard, Suite 450 Lakewood, CO, USA, 80228 2. I graduated with a Bachelors of Science degree in Geology from University of Rochester in 1994. 3. I am a Qualified Professional (QP) Member of the Mining and Metallurgical Society of America (01455QP) with special expertise in Geology and Ore Reserves. 4. I have worked as a geologist for a total of 18 years since my graduation from university, as an employee of an exploration company, a mining company, and as a consultant. My relevant experience includes exploration, geologic modeling, and resource estimation, reserves definition in feasibility studies, ore control systems, and mine-model reconciliation, particularly for structurally controlled hydrothermal systems. 5. I have read the definition of “qualified person” set out in National Instrument 43-101 (NI 43- 101) and certify that by reason of my education, affiliation with a professional association (as defined in NI 43-101) and past relevant work experience, I fulfill the requirements to be a “qualified person” for the purposes of NI 43-101. 6. I am responsible for Sections 7 through 12, and 14 of the technical report entitled “NI 43-101 Technical Report on the Yauricocha Mine, Yauyos Province, Peru,” dated May 11, 2015, with an effective date of December 31, 2014, (the “Technical Report”), and am also responsible for the overall organization and content of the document. I visited the project site on September 29 to October 4, 2013. 7. I previously was responsible for Sections 7 through 12, and 14 of the technical report entitled “NI 43-101 Technical Report on the Yauricocha Mine, Yauyos Province, Peru,” dated November 15, 2013, with an effective date of October 1, 2013 and was also responsible for the overall organization and content of the document. May 11, 2015 iii Sierra Metals, Inc. Certificate of Author Forms Yauricocha Mine NI 43-101 Technical Report 8. I am independent of the issuer applying all of the tests in section 1.5 of National Instrument 43-101. 9. I have read NI 43-101 and Form 43-101F1, and the Technical Report has been prepared in compliance with that instrument and form. 10. I consent to the filing of the Technical Report with any stock exchange and other regulatory authority and any publication by them for regulatory purposes, including electronic publication in the public company files on their websites accessible by the public, of the Technical Report. 11. As of the date of this certificate, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. Dated this 11th day of May, 2015 /s/ Thomas C. Matthews Signature of Qualified Person Thomas C. Matthews Printed Name of Qualified Person May 11, 2015 iv Sierra Metals, Inc. Certificate of Author Forms Yauricocha Mine NI 43-101 Technical Report DEEPAK MALHOTRA, PhD, Member AusIMM, SME, CIMM Resource Development, Inc. 11475 West I-70 Frontage Road North Wheat Ridge, Colorado 80033 Telephone: (303) 422-1176 Facsimile: (303) 424-8580 Email: [email protected] CERTIFICATE of AUTHOR I, Deepak Malhotra do hereby certify that: 1. I am currently employed as President at: Resource Development, Inc. 11475 West I-70 Frontage Road North Wheat Ridge, Colorado 80033 2. I am a graduate of Colorado School of Mines with a M.Sc. degree in Metallurgical Engineering (1974), and PhD in Mineral Economics (1978). 3. I am a registered member of the Society of Mining, Metallurgy and Exploration, Inc. (SME), member No. 2006420RM. 4. I have worked as a Metallurgist/Mineral Economist for a total of 40 years since my graduation from university; as an employee of several mining companies, an engineering company, a mine development and mine construction company, an exploration company, and as a consulting engineer. 5. I have read the definition of “qualified person” set out in National Instrument 43-101 (“NI 43-101”) and certify that by reason of my education, affiliation with a professional association (as defined in NI 43-101) and past relevant work experience, I fulfill the requirements to be a “qualified person” for the purposes of NI 43-101. 6. I am responsible for the preparation of the technical report titled “NI 43-101 Technical Report on the Yauricocha Mine, Yauyos Province, Peru,” dated May 11, 2015, with an effective date of December 31, 2014, (the “Technical Report”), with specific responsibility for Section 13 and 17. I visited the project site on September 29 to October 4, 2013. 7. I previously was responsible for Sections 13 and 17 of the technical report entitled “NI 43- 101 Technical Report on the Yauricocha Mine, Yauyos Province, Peru,” dated November 15, 2013, with an effective date of October 1, 2013I am independent of the issuer applying all of the tests in Section 1.5 of National Instrument 43-101.
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