MAG Announces Robust New PEA Based on Substantially Increased Juanicipio Mineral Resource

VANCOUVER, BRITISH COLUMBIA--(Marketwired - Nov 7, 2017) - MAG Silver Corp. (TSX:MAG)(NYSE American:MAG)(NYSE MKT:MAG) ("MAG") is pleased to announce the results of an independent National Instrument 43-101 Technical Report encompassing a new Mineral Resource estimate and Preliminary Economic Assessment ("PEA") for the stand-alone Juanicipio Joint Venture Project ("Juanicipio Project") in Zacatecas State, Mexico, owned 44% by MAG and 56% by the operator Fresnillo Plc ("Fresnillo"). The studies were commissioned by MAG and carried out by AMC Mining Consultants (Canada) Ltd. ("AMC"). Unless otherwise noted, all numbers are reported in US dollars on a 100% basis.

MINERAL RESOURCE AND PROJECT HIGHLIGHTS

2017 MINERAL RESOURCE HIGHLIGHTS

• High grade silver-rich Bonanza Zone (basis for development to date) containing:
  • 8.2 million ("M") Indicated Resource tonnes at 550 grams per tonne ("g/t") silver; and,
  • 2.0 M Inferred Resource tonnes at 648 g/t silver.
• Significantly expanded Mineral Resource for the base metal-rich Deep Zone, containing:
  • 4.7 M Indicated Resource tonnes with 209 g/t silver, 2.96% lead, 4.73% zinc, and 0.23% copper; and,
  • 10.1 M Inferred Resource tonnes with 151 g/t silver, 2.69% lead, 5.05% zinc, and 0.31% copper.
• Consistent gold across both zones, containing:
  • 12.8 M Indicated Resource tonnes at 2.10 g/t gold; and,
  • 12.1 M Inferred Resource tonnes at 1.44 g/t gold.

The new 2017 PEA outlined below stems from the new Mineral Resource estimate and confirms the Juanicipio Project as a robust, high-grade, high-margin underground silver project exhibiting low development risks. The new PEA incorporates major overall project upgrades highlighted by the delineation and provision for mining of greatly expanded Indicated and Inferred Mineral Resources in the recently discovered (2015) "Deep Zone". The volume of these new base metal-rich Deep Zone Resources contributed to a significant expansion of project scope and enhancements to most aspects of the mine design; the most important being an increase of the planned production rate to 4,000 tonnes per day. Within the expanded scope of the new PEA the Juanicipio Project is projected to produce a payable total of 183 million silver ounces, 750 thousand gold ounces, 1.3 billion pounds of zinc and 812 million pounds of lead over an initial 19 years of mine life.

⁽¹⁾ AISC (All In Sustaining Cost) – see tables 1 and 10 for calculation methodology.

2017 PEA BASE CASE HIGHLIGHTS

• 4,000 tonnes per day ("tpd") production rate with an initial 19 years of mine life;
• Enhanced project engineering, including: new plant and tailings location on flat, open ground; underground crusher and ore conveyor system; ramp expansions and internal shaft (winze);
• Low All-In Sustaining Costs ("AISC") of $5.02 per ounce ("oz") of silver;
• $360 M initial capital cost from January 1, 2018 to projected production start-up in H1, 2020;
• Payback in less than two years after plant start-up;
• Pre-tax Net Present Value ("NPV") at a 5% discount rate of $1.86 billion and an Internal Rate of Return ("IRR") of 64.5%; and;
• After-tax NPV at a 5% discount rate of $1.14 billion and IRR of 44.5%.

"We are very pleased to see the strong positive impact of the enhanced project scope on the already remarkable economics of the Bonanza Zone," said George Paspalas, MAG Silver President and CEO. "The PEA considers expanding the throughput from 2,650 tpd to 4,000 tpd, a reformulated ramp system, underground crusher-conveyor system and an internal shaft for expediting extraction of the mineralization towards the base of the previously known resources together with the new Deep Zone resources. The fact that we can accomplish the scaled-up project in a short time period and for a relatively small Capex increase is testimony to the quality of the asset and the insightful experience brought to the project by our partner and project operator, Fresnillo. With over $121 million in cash and cash equivalents as at September 30, 2017, we believe MAG is funded for its share of the development well into 2019."

Mr. Paspalas continued, "Strong margins drive the solid economics of Juanicipio. The upside to higher metal prices is obvious, but equally important, the project even shines brightly at significantly lower metal prices: At $8/oz silver and $0.75/lb zinc, the project still delivers an after-tax IRR of 15%."

Lastly, Mr. Paspalas noted, "The most exciting aspect to Juanicipio remains the immediate and long-term exploration upside. We know the Valdecañas Deep Zone is open in several directions and we have yet to test a number of high-potential targets for additional epithermal veins, or possible vein systems on the property."

TECHNICAL AND FINANCIAL DETAILS

The PEA Base Case uses a 5% discount rate and metal prices of $17.90/oz for silver, $1,250/oz for gold, $0.95 per pound ("lb") for lead and $1.00/lb for zinc. The PEA presents a range of metal pricing scenarios on both a pre-tax and after-tax basis. Unless otherwise noted, all numbers are reported in US dollars on a 100% basis. Table 1 below illustrates the effect of various price levels on key economic measures.

Table 1: Metal Price Sensitivity Analysis:

While the results of the PEA are significantly promising, by definition a Preliminary Economic Assessment is preliminary in nature and includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as Mineral Reserves. There can therefore be no certainty that the results in the PEA will be realized. This new PEA is based on MAG's understanding of how the project is being developed; however, Fresnillo is the project operator and the actual development plan and timeline may be materially different (see "Feasibility Study" below). It is also important to note that Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability and there is no certainty that Mineral Resources will ever become Mineral Reserves.

Table 1 above highlights how the project's low costs and high silver grades have the ability to generate resilient, highly positive and high margin economics across a range of metal-price scenarios, with the greatest metal price sensitivity being to the silver price, and to a lesser degree, to the zinc price. Silver and zinc account for 52% and 21%, respectively, of the gross revenue under the Base Case scenario: the impact of varying silver and zinc prices on the after-tax NPV and IRR is outlined in Table 2.

Table 2: Impact of Varying Silver and Zinc pricing on after-tax NPV and IRR⁽¹⁾:

⁽¹⁾ Gold at $1,250/oz and lead at $0.95/lb

Updated Mineral Resource Estimate

The updated independent Mineral Resource estimate was generated using a cut-off Net Smelter Return ("NSR") value of $55 per tonne ("/t") and drilling data available up to December 31, 2016. This estimate has an effective date of October 21, 2017 (see Table 3) and reflects the results of both infill and exploration holes drilled in 2014 through 2016, with the greatest increase shown within the Deep Zone discovered in 2015. The Valdecañas Vein displays well the vertical mineralization gradations from upper silver-rich zones to deep base metal-dominant areas that are typical of Fresnillo District veins and epithermal silver veins in general. Because of this vertical compositional zonation, and significant dimensional increases with depth, the Mineral Resource estimate has been manually divided into the Bonanza Zone and the Deep Zone to highlight the definition of each zone.

Table 3: Juanicipio Project Mineral Resource estimate by zone (October 21, 2017):

The Bonanza Zone resource veins have a similar footprint as previous Mineral Resource estimates (see press release dated, May 27, 2014), with approximately 78% of the total silver ounces in the Bonanza Zone now classified as Indicated. The newly updated Mineral Resource estimate significantly expands the Inferred and Indicated resources in the base metal-rich Deep Zone, which includes a maiden copper resource.

Total Mineral Resources - Bonanza Zone and Deep Zone Combined and by vein

Combining the Bonanza Zone and the base metal-rich Deep Zone into a total global resource by Mineral Resource classification, results in a lower overall silver grade reflecting the blending of high and lower grade materials (See Table 4).

Table 4: Juanicipio Project Global Mineral Resource Estimate and summary by vein (October 21, 2017):

Mine Design

The principal mining method proposed in the PEA is longhole stoping with waste rock back-fill at a production rate of 4,000 tpd using modern mining equipment.

From the results of a series of trade-off studies previously commissioned by Minera Juanicipio S.A. de C.V. ("Minera Juanicipio"), the joint venture company, truck hauling, shaft hoisting, and conveying, along with underground crushing of the mineralized rock are all projected to be utilized for delivering the mineralized rock to the surface processing plant. An underground winze (internal shaft) is planned to be sunk within the hangingwall of the Valdecañas Vein System, to hoist mineralized rock from lower levels of the mine to the underground crusher and conveying system from the 6^th year after start-up (projected as 2025), onward.

The Mineral Resource used for the PEA mine design does not include any of the Juanicipio Vein resource which is included in the Mineral Resources above (Table 4). Further analysis is required to arrive at a potential extraction strategy, with the possibility that these resources may ultimately be brought into a future mining plan.

No copper circuit has been included in this PEA as no metallurgical testing and recovery assessment for copper has yet been completed.

Process Plant

Metallurgical test-work conducted between 2008 and 2015 on composite samples from 67 drill hole intercepts was used to design the mineral processing facility. Mill recoveries are estimated as:

The process plant is expected to ramp up operations over a three-year period to a steady state throughput rate of 1.4 M tonnes/year (4,000 tpd). The PEA mine plan indicates that total production of 23.3 M tonnes will be processed, estimated by applying a $55/t NSR cut-off grade to the Mineral Resource model and then allowing for dilution as well as mining recovery and design losses. The PEA LOM production scenario contains an estimated 210 M oz of silver, 1.017 M oz of gold, 940 M lbs of lead, and 1.746 billion lbs of zinc.

The proposed process plant and tailings storage facility will be located in newly acquired open, flat ground. It will include a SAG/Ball mill comminution circuit followed by sequential flotation to produce a silver-rich lead concentrate, a zinc concentrate and a gold-rich pyrite concentrate.

LOM Payable Metal

Table 5: Estimated LOM payable production by metal including Silver Equivalent (Silver Eq) ounces:

Footnotes:

1. Lead, zinc, and pyrite concentrates produced.
2. Silver Equivalent calculated using the base case metal recoveries and base case metal prices of $17.90/oz for silver; $1250/oz for gold; $0.95/lb for lead and $1.00/lb for zinc.

Payable production for each metal is based on processing recoveries less smelter deductions and losses during third party treatment of the lead, zinc and pyrite concentrates.

Capital Costs

Capital expenditure estimates have been prepared for both initial and sustaining capital. A projected summary timeline of scheduled capital costs is shown in Table 6.

Table 6: Initial Capital and Sustaining Capital Schedule

⁽¹⁾ Sustaining capital is projected to be funded from operational cash-flow

Initial Capital Costs

The initial capital expenditures (Table 7) for the project, inclusive of capitalized operating costs, as estimated by AMC and as of January 1, 2018, are $360 M (Fresnillo Plc 56% ($201.6) and MAG 44% ($158.4 M)), including all mine development-related costs to be incurred prior to the envisaged commencement of commercial operations in 2020. Capital costs incurred after start-up are assigned to sustaining capital and are projected to be paid out of operating cash-flows (also see Table 7). Contingencies have been added at appropriate percentages to each component of the project, excluding capitalized operating costs, resulting in an overall contingency of $39.7 M or 17%.

Table 7: Initial and Sustaining Capital Cost Estimates ($M) - 100% basis

Note: Totals do not necessarily equal the sum of the components due to rounding adjustments.

Sustaining Capital Costs:

Sustaining capital of $480 M (Table 7), to be funded from operating cash flow, will be required throughout the life of mine. This capital will primarily be for waste development (footwall); replacement of mining equipment; major mill maintenance; major surface infrastructure upgrades and replacements; and completion of the internal shaft (winze). Mine closure costs are assumed to be equal to the salvage value of the mine plant and equipment.

On Site Operating Costs ("Opex")

The estimated Opex for the PEA is $58.67/t of mill feed - see Table 8. AMC estimated the Opex based on industry first principles, proprietary information and experience.

Table 8: On Site Operating Cost:

Note: Totals do not necessarily equal the sum of the components due to rounding adjustments.

Off-Site Costs (Concentrate Transport, Treatment and Refining Charges)

Projected Treatment Charges ("TCs") and transport charges for the lead and zinc concentrates were provided to AMC by Neil S. Seldon & Associates, specialist consultants in concentrate marketing. AMC considers that the projections received are reasonable. It is anticipated that the zinc concentrate will be sold primarily to smelters in Asia while the lead concentrate could potentially be sold to a smelter in Mexico or exported to offshore smelters. For purposes of its analysis, AMC has assumed that both the lead and zinc concentrates will be treated in Asia and subject to a transport cost of $115/wet metric tonne.

LOM off-site costs for lead and zinc concentrates included in the PEA are estimated to average $41.32/t of mill feed. Off-site costs comprise freight charges (highway and ocean), port handling fees, and smelter treatment and refining charges - see Table 9.

Table 9: Off Site Costs - Lead, Zinc and Pyrite concentrates:

Taxes

Income and other taxes presented in the PEA are based on Mexican legislated tax rates and do not reflect any tax planning opportunities. Specific rates used are outlined in Table 10 below, and result in total LOM combined taxes of $1,157 M in the base case scenario.

Costs per Ounce of Silver

LOM estimated combined on-site opex ($58.67/t) and off-site costs ($41.32/t) are $99.99/t of mill feed, or $2,312 M. The LOM Cash Cost (on-site and off-site, less by-product credits) is negative US ($3.94)/oz silver, and Total Cash Cost (including taxes) is $2.39/oz silver. All-In Sustaining Costs (AISC) total $5.02/oz silver, and include total cash costs plus sustaining capital. See Table 10.

Table 10: Cash Costs, Total Cash Costs and AISC per oz of Silver (Base Case)

Undiscounted Cash-flow, Revenue and Cost

A summary of estimated gross revenue, costs and resulting undiscounted cash flow over the LOM is provided in Table 11.

Table 11: LOM Undiscounted Cash Flow, Revenue and Cost Summary (Base Case)

Note: Totals do not necessarily equal the sum of the components due to rounding adjustments.

Additional Considerations Related to the Preliminary Economic Assessment

As a Preliminary Economic Assessment, the 2017 PEA and its estimated costs are subject to an approximate margin of error of plus or minus 25%. Readers should note that approximately 38% of the tonnage and 25% of the silver content of the material that forms the basis of the economic assessment is derived from Inferred Mineral Resources. The PEA is preliminary in nature in that it includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as Mineral Reserves. There is no certainty that any of the Mineral Resources will become Mineral Reserves, or that the PEA will be realized.

Feasibility Study

This 2017 PEA was commissioned independently by MAG, and not by the Juanicipio Joint Venture. The mine plan and mine design anticipated in the 2017 PEA are based on both Inferred and Indicated Mineral Resources and reflect a processing capacity of 4,000 tonnes per day, expanded underground workings and the sinking of an internal shaft (or winze) to access the deeper areas of the previously estimated Mineral Resources and the newly defined Deep Zone. The 2017 PEA is based on our understanding of the operator's development to date and our understanding of the development permit applications submitted by the operator which we understand are expected to be issued prior to December 31, 2017, although there is no assurance that such permits will be issued on a timely basis or at all.

As a requirement of the Minera Juanicipio Shareholders' Agreement, Minera Juanicipio has commissioned a Feasibility Study as a basis for a "Production Decision" expected in early 2018 The Feasibility Study, also to be prepared by AMC, will not include Inferred Mineral Resources in the mine plan, so the results of the Feasibility Study will be different from the results of the 2017 PEA. There is no assurance that the Feasibility Study will recommend proceeding with the project development, and any recommendation to proceed with development may differ significantly from the scope and design recommended in the 2017 PEA. Changes to the mine plan and mine design that may be recommended in the Feasibility Study, if approved and implemented, will impact the Juanicipio Project's construction schedule, capital and operating costs, profitability and cash flows and timeline to production, the impact of which cannot be quantified at this time. As a result, there are additional uncertainties with respect to the size and grade of the Mineral Resources that may become Mineral Reserves and that will serve as the basis for the Feasibility Study, the extent of capital and operating costs, mineral recoveries and financial viability.

There is no guarantee that development and construction will be completed in accordance with the 2017 PEA, and if completed, that production will begin or that operating or financial results will be consistent with the 2017 PEA.

Further Information:

An investor conference call with MAG's President and CEO, George Paspalas and management, will be held November 7, 2017 at 4:30 pm Eastern time (1:30 pm Pacific time). To participate, please dial: Canada/USA toll-free (800) 319-4610 or International toll-free (604) 638-5340 and request to join the "MAG Silver Conference Call". Participants please dial in five to 10 minutes prior to the scheduled start time.

Qualified Person:

The Mineral Resources disclosed in this press release for the Juanicipio Project have been prepared by Dr. A. Ross, Ph.D., P.Geo. an employee of AMC Mining Consultants (Canada) Ltd. who is independent of MAG and a "Qualified Person" for the purpose of National Instrument 43-101. Dr. Ross has read and approved the content of this press release as it pertains to the disclosed Mineral Resource estimate.

The estimates for metal recovery, and the design and methodology for mineral processing that form the basis for the economic assessment disclosed in this press release for the Juanicipio Project have been prepared by Harald Muller, FAusIMM, a former employee of AMC Mining Consultants (Canada) Ltd. who is independent of MAG. By virtue of his education and relevant experience Mr. Muller is a "Qualified Person" for the purpose of National Instrument 43-101. Mr. Muller, has read and approved the content of this press release as it pertains to the mineral processing disclosures.

The cost estimations, infrastructure needs and costs that form the basis for the economic assessment, and the financial analysis, disclosed in this press release for the Juanicipio Project have been prepared by Carl Kottmeier, P. Eng. an employee of AMC Mining Consultants (Canada) Ltd. who is independent of MAG. By virtue of his education and relevant experience Mr. Kottmeier is a "Qualified Person" for the purpose of National Instrument 43-101. Mr. Kottmeier, has read and approved the content of this press release as it pertains to cost estimations, infrastructure needs and costs, and financial analysis.

The estimate of the tonnage and grade of material to be mined and processed that form the basis for the economic assessment, and the financial analysis, disclosed in this press release for the Juanicipio Project have been prepared by Gary Methven, P. Eng. an employee of AMC Mining Consultants (Canada) Ltd. who is independent of MAG. By virtue of his education and relevant experience Mr. Methven is a "Qualified Person" for the purpose of National Instrument 43-101. Mr. Methven, has read and approved the content of this press release as it pertains to all mining matters other than the Mineral Resource estimate, mineral processing disclosures, costs estimations, infrastructure needs and costs, and financial analysis.

A National Instrument 43-101 Technical Report documenting the updated Mineral Resource and associated PEA will be filed on SEDAR within 45 days.

Information Concerning Estimates of Mineral Resources

Cautionary Note to Investors Concerning Estimates of Indicated Resources

This press release uses the term "Indicated Resources". MAG advises investors that although this term is recognized and required by Canadian regulations (under National Instrument 43-101 - Standards of Disclosure for Mineral Projects), the U.S. Securities and Exchange Commission does not recognize this term. Investors are cautioned not to assume that any part or all of mineral deposits in this category will ever be converted into reserves.

Cautionary Note to Investors Concerning Estimates of Inferred Resources

This press release uses the term "Inferred Resources". MAG advises investors that although this term is recognized and required by Canadian regulations (under National Instrument 43-101-Standards of Disclosure for Mineral Projects), the U.S. Securities and Exchange Commission does not recognize this term. Investors are cautioned not to assume that any part or all of the mineral deposits in this category will ever be converted into reserves. In addition, "Inferred Resources" have a great amount of uncertainty as to their existence, and economic and legal feasibility. It cannot be assumed that all or any part of an Inferred Mineral Resource will ever be upgraded to a higher category. Under Canadian rules, estimates of Inferred Mineral Resources may not form the basis of feasibility or pre-feasibility studies, or economic studies except for Preliminary Assessment as defined under Canadian National Instrument 43-101. Investors are cautioned not to assume that part or all of an Inferred Resource exists, or is economically or legally mineable.

About MAG Silver Corp. (www.magsilver.com)

MAG Silver Corp. is a Canadian exploration and development company focused on becoming a top-tier primary silver mining company, by exploring and advancing high-grade, district scale, silver-dominant projects in the Americas. Our principal focus and asset is the Juanicipio Property (44%), being developed in partnership with Fresnillo Plc (56%) and is located in the Fresnillo Silver District in Mexico, the world's premier silver mining camp. We are presently developing the underground infrastructure on the property, under the operational expertise of our joint venture partner, Fresnillo Plc, to support an expected 4,000 tonnes per day mining operation. As well, we have an expanded exploration program in place investigating other highly prospective targets across the property. In addition, we continue to work on regaining surface access to our 100% owned Cinco de Mayo property in Mexico while we seek other high grade, district scale opportunities.

On behalf of the Board of MAG SILVER CORP.

George Paspalas, Chief Executive Officer

Neither the Toronto Stock Exchange nor the NYSE American have reviewed or accepted responsibility for the accuracy or adequacy of this press release, which has been prepared by management.

This release includes certain statements that may be deemed to be "forward-looking statements" within the meaning of the US Private Securities Litigation Reform Act of 1995 and applicable Canadian Securities laws. All statements in this release, other than statements of historical facts are forward looking statements, including the anticipated time and capital schedule to production; estimated project economics, including but not limited to, mill recoveries, payable metals produced, production rates, payback time, capital and operating and other costs, IRR and mine plan; expected upside from additional exploration; expected capital requirements; and other future events or developments. Forward-looking statements are often, but not always, identified by the use of words such as "seek", "anticipate", "plan", "continue", "estimate", "expect", "may", "will", "project", "predict", "potential", "targeting", "intend", "could", "might", "should", "believe" and similar expressions. These statements involve known and unknown risks, uncertainties and other factors that may cause actual results or events to differ materially from those anticipated in such forward-looking statements. Although MAG believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements are not guarantees of future performance and actual results or developments may differ materially from those in the forward-looking statements. Factors that could cause actual results to differ materially from those in forward-looking statements include, but are not limited to, changes in commodities prices; changes in expected mineral production performance; unexpected increases in capital costs; exploitation and exploration results; continued availability of capital and financing; differing results and recommendations in the Feasibility Study; and general economic, market or business conditions. In addition, forward-looking statements are subject to various risks, including but not limited to operational risk; political risk; currency risk; capital cost inflation risk; that data is incomplete or inaccurate; the limitations and assumptions within drilling, engineering and socio-economic studies relied upon in preparing the PEA; and market risks. The reader is referred to the Company's filings with the SEC and Canadian securities regulators for disclosure regarding these and other risk factors. There is no certainty that any forward-looking statement will come to pass and investors should not place undue reliance upon forward-looking statements. The Company does not undertake to provide updates to any of the forward-looking statements in this release, except as required by law.

This news release presents certain financial performance measures, including all in sustaining costs (AISC), cash cost and total cash cost that are not recognized measures under IFRS. This data may not be comparable to data presented by other silver producers. The Company believes that these generally accepted industry measures are realistic indicators of operating performance and are useful in allowing comparisons between periods. Non-GAAP financial performance measures should be considered together with other data prepared in accordance with IFRS. This news release contains non-GAAP financial performance measure information for a project under development incorporating information that will vary over time as the project is developed and mined. It is therefore not practicable to reconcile these forward-looking non-GAAP financial performance measures.

Please Note:

Investors are urged to consider closely the disclosures in MAG's annual and quarterly reports and other public filings, accessible through the Internet at www.sedar.com and www.sec.gov/edgar/searchedgar/companysearch.html.

Contact

MAG Silver Corp.
Michael J. Curlook
VP Investor Relations and Communications
(604) 630-1399 or Toll Free: (866) 630-1399
(604) 681-0894
info@magsilver.com
www.magsilver.com