NYRSTAR : 2013 Mineral Resource and Mineral Reserve Statement

30 April 2014

Nyrstar NV ('Nyrstar', the 'Company' or the 'Group) reports its mineral resources, mineral reserves and exploration results in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum ('CIM') definitions as set forth in the CIM Definition Standards for Mineral Resources and Mineral Reserves, as amended (the 'CIM Definition Standards'), which have been incorporated by reference into the National Instrument 43-101 - Standards of Disclosure for Mineral Projects ('NI 43-101') with respect to the Campo Morado, El Mochito, El Toqui, Langlois and Myra Falls mines; and the Australasian Code for Reporting Exploration Results, Mineral Resources and Ore Reserves, as amended and prepared by the Joint Ore Reserves Committee of the Australasian Institute of Mining and Metallurgy, Australian Institute of Geoscientists and Minerals Council of Australia (the 'JORC Code') with respect to the Contonga, East Tennessee and Middle Tennessee mines.

A 'mineral resource' is a concentration or occurrence of material of intrinsic economic interest in or on the Earth's crust in such form, quality and quantity that there are reasonable prospects for eventual economic extraction. The location, quantity, grade, geological characteristics and continuity of a mineral resource are known, estimated or interpreted from specific geological evidence and knowledge. Mineral resources are sub-divided in order of increasing geological confidence into inferred, indicated and measured categories. For more information on these categories, see the Definitions at the end of this release.

A 'mineral reserve' (referred to as an 'ore reserve' under the JORC Code) is the economically mineable part of a measured and/or indicated mineral resource. It includes diluting materials and allowances for losses, which may occur when the material is mined. Appropriate assessments and studies have been carried out, and include consideration of and modification by realistically assumed mining, metallurgical, economic, marketing, legal, environmental, social and governmental factors. These assessments demonstrate at the time of reporting that extraction could reasonably be justified. Mineral reserves are sub-divided in order of increasing confidence into probable mineral reserves and proved mineral reserves. For more information on these categories, see the Definitions at the end of this release.

Mineral resources in this document are reported inclusive of mineral reserves.

The mineral resources and mineral reserves in the following tables use a cut-off date of 31 December 2013, unless otherwise stated. The data was prepared by or under the supervision of a Qualified Person ('QP') as defined in NI 43-101 or a Competent Person ('CP') as defined in the JORC Code, as applicable.

Commodity prices and exchange rates used to estimate the economic viability of mineral reserves are based on long term forecasts applied at the time the estimate was calculated. Nyrstar's metal price assumptions for estimation of year-end 2013 resources and reserves are as follows: Zinc USD2,500/t, Lead USD 2,300/t, Copper USD7,200/t, Silver USD 23.00/oz, and Gold USD1,350/t. For more information on the estimated nature of mineral resources and mineral reserves, see the Important Notice in this release.

Nyrstar's management has decided to disclose its mineral resource and reserve statement in accordance with the Canadian NI 43-101 Standard or the Australasian JORC Code, to the public in order to increase the understanding of the Company's mining assets. Nyrstar's approach to the exploration and development of its mining assets, once in a stable operating capacity, is to ensure that management has sufficient information regarding mineral deposits to extract material in an efficient method and to maximise mining asset value over the short to medium term. Where appropriate, Nyrstar's management aims to replace the reserve base, and measured and indicated resources that have been extracted and to ensure it adopts optimal mine plans for mining assets over the medium term.

Nyrstar initiated a strategic review of its Mining segment in the second half of 2013. As an outcome of the review, Coricancha and Pucarrajo were identified as non-core mining assets, and are therefore not included in this disclosure. During the third quarter of 2013, Coricancha was placed on care and maintenance, and Nyrstar has not mined Pucarrajo since its acquisition in 2010. The mining strategic review remains ongoing with a further update expected in the second half of 2014.

Important Notice

Although Nyrstar discloses its Mineral Resource and Mineral Reserve Statement in accordance with the requirements of the applicable disclosure standards, this disclosure is based on estimates, which while prepared by QPs and CPs in accordance with relevant mining standards, are subject to numerous uncertainties inherent in estimating quantities and classification of resources and reserves (including subjective judgments and determinations based on available geological, technical, contracted and economic information). Therefore, these statements should not be interpreted as assurances of mine life or of the profitability of current or future operations.

Resources and reserves prepared by different QPs and CPs are estimates based on different technical assumptions (all of which comply with the applicable mining standards) and may vary as a result. There is no assurance that had such statements been prepared by the same engineers applying a uniform methodology, they would not differ substantially.

Resource and reserve information contained herein is based on engineering, economic and geological data assembled and analysed by Nyrstar and third parties in some cases. Estimates as to both quantity and quality are periodically updated to reflect extraction of commodities and new drilling or other data received. There are numerous uncertainties inherent in estimating quantities and qualities of reserves and costs to mine, including many factors beyond Nyrstar's control. Estimates of reserves necessarily depend upon a number of variable factors and assumptions, all of which may vary considerably from the  actual results, such as:

• geological and mining conditions which may not be fully identified by available exploration data, or which may differ from experience in current operations;
• historical production from the area compared with production from other similar producing areas; and
• the assumed effects of regulation and taxes by governmental agencies and assumptions concerning commodity prices, operating costs, mining technology improvements, severance and excise tax, development costs and reclamation costs.

Further, mineral resource estimates, prepared in accordance with applicable mining standards are based on concentrations or occurrences of minerals that are judged to have reasonable prospects for economic extraction, but for which the economics of extraction cannot be assessed, whether because of insufficiency of geological information or lack of feasibility analysis, or for which economic extraction cannot be justified at the time of reporting. Consequently, mineral resources are of a higher risk and are less likely to be accurately estimated or recovered than mineral reserves.

Assumptions that are valid at the time of estimation may change significantly when new information becomes available, requiring a reassessment of reserves. Such changes in reserves could also impact depreciation and amortisation rates, asset carrying values, deferred stripping calculations and provisions for close down, restoration and environmental remediation costs.

If the prices of the commodities produced by Nyrstar decrease, or if there are adverse changes in treatment charges or foreign exchange rates, certain of Nyrstar's reserves, which are currently classified as proved or probable may cease to be classified as recoverable as they become uneconomic to mine. In addition, changes in operating, capital or other costs may have the same effect by rendering certain mineral reserves uneconomic to mine in the future. Should such reductions occur, material write-downs of its investment in mining properties or the discontinuation of development or production might be required, and there could be material delays in the development of new projects, increased net losses and reduced cash flow. Moreover, short-term operating factors relating to mineral reserves, such as the need for orderly development of the mineral deposit or the processing of new or different mineral grades, may cause a mining operation to be unprofitable in any particular accounting period.

No assurance can be given that the anticipated tonnages and grades will be achieved or that the indicated level of recovery will be realised. The volume and grade of reserves actually recovered and rates of production from the Company's present mineral reserves may be less than geological measurements of the reserves, which may result in Nyrstar realising less value from such reserves than has been predicted. In the future, short term operating factors relating to mineral reserves, such as the need for development of ore bodies and other mineral resources, or the processing of different ore grades, may cause mineral reserves to be modified or Nyrstar's operations to be unprofitable in a particular period.

No assurance can be given that the indicated amount of reserves of ore or other minerals will be recovered, or will be recovered at the prices assumed. Reserve estimates are based on limited sampling and, consequently, are uncertain because the samples may not be representative of the entire ore body and mineral resource. As a better understanding of the ore body or resource is obtained, the reserve estimates may change significantly, either positively or negatively.

For these reasons, estimates and classifications of reserves prepared by different engineers or by the same engineers at different times may vary substantially. Actual commodity tonnage recovered from identified reserves and revenue and expenditures with respect to the reserves may vary materially from estimates. Accordingly, these reserve estimates may not accurately reflect Nyrstar's actual reserves. Any inaccuracy in the estimates related to the reserves could result in lower than expected revenue, higher than expected costs and decreased profitability.

All mineral resources and mineral reserves contained in this release should be read subject to the above risks.

Industry Terms and Abbreviations

The following industry terms and abbreviations are used within this document:

'Net smelter return' (or 'NSR') is the net revenue (total revenue minus production costs) that the owner of a mining property receives from the sale of the mine's metal/non-metal products less transportation, smelting and refining costs.

'Mine cut-off grade' is the level of mineral in an ore below which it is not economically feasible to mine.

Forward-looking Statements

This release includes forward-looking statements. All statements in this release that do not relate to historical facts and events are "forward-looking statements". In some cases, forward-looking statements can be identified by terminology such as "may", "will", "should", "could", "would", "expect", "plan", "anticipate", "believe", "estimate", "continue", "goal", "intention", "objective", "aim", "strategy", "budget", "proposed", "schedule" or the negative of such terms or other similar expressions. By their nature, forward-looking statements are subject to inherent risks and uncertainties, both general and specific, and the predictions, forecasts, projections and other forward-looking statements contained in this release could be materially different from what actually occurs in the future.

Although Nyrstar believes that its expectations with respect to forward-looking statements are based on reasonable assumptions within the bounds of its knowledge of its business and operations as of the date of this release, a number of important factors could cause actual results to differ materially from the plans, objectives, expectations, estimates and intentions expressed in such forward-looking statements.

The forward-looking statements contained in this release speak only as of the date of this release or, if obtained from third party studies or reports, the date of the corresponding study or report and are expressly qualified in their entirety by the cautionary statements included in this release. Without prejudice to Nyrstar's obligations under applicable law in relation to disclosure and on-going information, Nyrstar does not undertake any obligation to update publicly or revise any forward-looking statements, whether as a result of new information, future events or otherwise. In light of these risks, uncertainties and assumptions, the forward-looking events discussed in this release might not occur.

About Nyrstar

Nyrstar is an integrated mining and metals business, with market leading positions in zinc and lead, and growing positions in other base and precious metals; essential resources that are fuelling the rapid urbanisation and industrialisation of our changing world. Nyrstar has mining, smelting, and other operations located in Europe, the Americas, China and Australia and employs approximately 6,500 people. Nyrstar is incorporated in Belgium and has its corporate office in Switzerland. Nyrstar is listed on NYSE Euronext Brussels under the symbol NYR. For further information please visit the Nyrstar website, www.nyrstar.com:
http://www.nyrstar.com

For further information

Amy Rajendran     Group Manager Investor Relations     T: +41 44 745 8103   M: +41 79 722 3089     E: amy.rajendran@nyrstar.com:
mailto:amy.rajendran@nyrstar.com

The full press release can be downloaded from the following link: