Sierra Metals Reports Strong Q1-2018 Financial Results at its Sociedad Minera Corona Subsidiary in Peru

• Financial results positively impacted by record throughput, increased production of higher value ore, and improved metal pricing

TORONTO, April 30, 2018 /PRNewswire/ - Sierra Metals Inc. (TSX:SMT, BVL:SMT) ("Sierra Metals" or the "Company") announces the filing of Sociedad Minera Corona S.A.'s ("Corona") unaudited Financial Statements and the Management Discussion and Analysis ("MD&A") for the first quarter of 2018 ("Q1 2018").

The Company holds an 81.8% interest in Corona. All amounts are presented in US dollars unless otherwise stated, and have not been adjusted for the 18.2% non-controlling interest.

Corona's Highlights for the Three Months Ended March 31, 2018

• Revenues of US$46.6 million vs. US$38.5 million in Q1 2017
• Adjusted EBITDA of US$24.2 million vs. US$20.5 million in Q1 2017
• Total tonnes processed of 271,389 vs. 251,180 in Q1 2017
• Net production revenue per tonne of ore milled increased by 7% to US$168.74
• Cash cost per zinc equivalent payable pound higher by 36% to US$0.57
• All in sustaining cost ("AISC") per zinc equivalent payable pound higher by 34% to US$0.82
• Zinc equivalent production of 34.8 million pounds vs. 38.1 million pounds in Q1 2017
• $23.2 million of cash and cash equivalents as at March 31, 2018
• $33.3 million of working capital as at March 31, 2018

"The Yauricocha Mine continued to be a strong performer in the first quarter of 2018" stated Igor Gonzales, President, and CEO of Sierra Metals.  "The Mine reported a 21% increase in revenue, and an 18% increase in adjusted EBITDA over the same period in 2017, continuing to reap the benefits of the operational improvements program and improved realized metal prices. Additionally, an increase in the net production revenue per tonne of ore milled continues to demonstrate that the capital investments at the Mine were well spent. Cash and all-in sustaining costs, while higher year over year, remained in line with previous quarters.

Corona continues to have a solid balance sheet, and strong liquidity, to meet its operational and growth expenditure requirements. Management is confident that further operational efficiencies and productivity improvements will be realized with the completion of key projects such as the Yauricocha tunnel expected in Q3 2018, in addition the sinking of the Yauricocha Shaft, which will provide access to a substantial amount of recently defined ore reserves and resources. Exploration also continues, and we look forward to further mineral discoveries and resource increases at the Mine."

The following table displays selected unaudited financial information for the three months ended March 31, 2018:

Corona's Financial Highlights for the Three Months Ended March 31, 2018

• Revenues of $46.6 million for Q1 2018 increased by 21% compared to $38.5 million of revenues in Q1 2017. The increase in revenues during Q1 2018 was due to an 8% increase in tonnes processed, higher head grades for copper and gold, and higher recoveries for copper. Increases in the prices of copper (17%), zinc (23%), lead (11%), and gold (9%) also contributed to the revenue improvement.
• Cash cost per zinc equivalent pound sold at the Yauricocha Mine of $0.57 for Q1 2018 compared to $0.42 for Q1 2017 and all-in sustaining cost ("AISC") per zinc equivalent pound sold of $0.82 for Q1 2018 compared to $0.61 for Q1 2017. The increase in the AISC per zinc equivalent payable pound for Q1 2018 compared to Q1 2017 were a result of fewer zinc equivalent pounds sold, despite higher throughput due to lower head grades; as well as slight increases to administrative costs and operating costs which included infill drilling and drift development costs that will be utilized within one year, and thus are included in opex.
• Adjusted EBITDA of $24.2 million for Q1 2018 compared to $20.5 million for Q1 2017 and the increase in adjusted EBITDA for Q1 2018 was due to the increase in revenues discussed previously.
• Operating cash flows before movements in working capital of $24.1 million for Q1 2018, compared to US$20.4 million for Q1 2017, and the increase in operating cash flows before movements in working capital for Q1 2018 was primarily due to the increase in revenues, discussed previously.
• Cash and cash equivalents of $23.2 million as at March 31, 2018, compared to $19.9 million as at December 31, 2017. Cash and cash equivalents increased by $3.3 million which was driven by operating cash flows of $10.2 million, and $5.0 million being drawn from a short term revolving line of credit for working capital purposes, partially offset by capital expenditures of $5.3 million, debt and interest payments of $1.7 million, intercompany loans of $2.1 million, and dividends paid of $2.9 million.
• Net income of $15.1 million, or $0.42 per share for Q1 2018 compared to net income of $11.9 million, or $0.33 per share for Q1 2017.

Corona's Operational Highlights for the Three Months Ended March 31, 2018:

The following table displays the production results for the three months ended March 31, 2018:

Qualified Persons

All production technical data contained in this news release has been reviewed and approved by Gordon Babcock, P.Eng., Chief Operating Officer and a Qualified Person under National Instrument 43-101 – Standards of Disclosure for Mineral Projects.

Americo Zuzunaga, MAusIMM CP (Mining Engineer) and Vice President of Corporate Planning is a Qualified Person and chartered professional qualifying as a Competent Person under the Joint Ore Reserves Committee (JORC) Australasian Code for Reporting of Exploration Results, Mineral Resources, and Ore Reserves.

Augusto Chung, FAusIMM CP (Metallurgist) and Consultant to Sierra Metals is a Qualified Person and chartered professional qualifying as a competent person on metallurgical processes.

About Sierra Metals

Sierra Metals Inc. is Canadian based growing polymetallic mining company with production from its Yauricocha Mine in Peru, and its Bolivar and Cusi Mines in Mexico. The Company remains focused on increasing production volume and growing mineral resources. Sierra Metals has recently had several discoveries and still has additional brownfield exploration opportunities at all three mines in Peru and Mexico that are within close proximity to the existing mines. Additionally, the Company has large land packages at all three mines with several prospective regional targets providing longer-term exploration upside and mineral resource growth potential.

The Company's Common Shares trade on the Bolsa de Valores de Lima and the Toronto Stock Exchange under the symbol "SMT" and the NYSE AMERICAN Exchange under the symbol "SMTS."

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Forward-Looking Statements

This press release contains "forward-looking information" and "forward-looking statements" within the meaning of Canadian and U.S. securities laws related to the Company (collectively, "forward-looking information"). Forward-looking information includes, but is not limited to, statements with respect to the Company's operations, including anticipated developments in the Company's operations in future periods, the Company's planned exploration activities, the adequacy of the Company's financial resources, and other events or conditions that may occur in the future. Statements concerning mineral reserve and resource estimates may also be considered to constitute forward-looking statements to the extent that they involve estimates of the mineralization that will be encountered if and when the properties are developed or further developed. These statements relate to analyses and other information that are based on forecasts of future results, estimates of amounts not yet determinable and assumptions of management. Any statements that express or involve discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions or future events or performance (often, but not always, using words or phrases such as "expects", "anticipates", "plans", "projects", "estimates", "assumes", "intends", "strategy", "goals", "objectives", "potential" or variations thereof, or stating that certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved, or the negative of any of these terms and similar expressions) are not statements of historical fact and may be forward-looking information.

Forward-looking information is subject to a variety of risks and uncertainties, which could cause actual events or results to differ from those reflected in the forward-looking information, including, without limitation, risks inherent in the mining industry including environmental hazards, industrial accidents, unusual or unexpected geological formations, floods, labour disruptions, explosions, cave-ins, weather conditions and criminal activity; commodity price fluctuations; higher operating and/or capital costs; lack of available infrastructure; the possibility that future exploration, development or mining results will not be consistent with the Company's expectations; risks associated with the estimation of mineral resources and the geology, grade and continuity of mineral deposits and the inability to replace reserves; fluctuations in the price of commodities used in the Company's operations; risks related to foreign operations; changes in laws or policies, foreign taxation, delays or the inability to obtain necessary governmental permits; risks relating to outstanding borrowings; issues regarding title to the Company's properties; risks related to environmental regulation; litigation risks; risks related to uninsured hazards; the impact of competition; volatility in the price of the Company's securities; global financial risks; inability to attract or retain qualified employees; potential conflicts of interest; risks related to a controlling group of shareholders; dependence on third parties; differences in U.S. and Canadian reporting of mineral reserves and resources; potential dilutive transactions; foreign currency risks; risks related to business cycles; liquidity risks; reliance on internal control systems; credit risks, including risks related to the Company's compliance with covenants with respect to its BCP Facility; uncertainty of production and cost estimates for the Yauricocha Mine, the Bolivar Mine and the Cusi Mine; and other risks identified in the Company's filings with Canadian securities regulators and the U.S. Securities and Exchange Commission, which filings are available at www.sedar.com and www.sec.gov, respectively.

This list is not exhaustive of the factors that may affect any of the Company's forward-looking information. Forward looking information includes statements about the future and are inherently uncertain, and the Company's actual achievements or other future events or conditions may differ materially from those reflected in the forward-looking information due to a variety of risks, uncertainties and other factors. The Company's statements containing forward-looking information are based on the beliefs, expectations and opinions of management on the date the statements are made, and the Company does not assume any obligation to update forward-looking information if circumstances or management's beliefs, expectations or opinions should change, other than as required by applicable law. For the reasons set forth above, one should not place undue reliance on forward-looking information.

Note Regarding Reserve and Resource Estimates

All reserve and resource estimates reported by the Company are calculated in accordance with the Canadian National Instrument 43-101 -  Standards of Disclosure for Mineral Projects and the Canadian Institute of Mining and Metallurgy Classification system. These standards differ significantly from the requirements of the SEC. The differences between these standards are discussed in our SEC filings. Mineral resources which are not mineral reserves do not have demonstrated economic viability.

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