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Northern Dynasty Refutes Short Seller Claims Short Seller’s Report Based on Misstatements, Inaccuracies and “Anonymous Sources” Northern Dynasty’s Pebble Project Has Been Assessed by Independent Experts as a Globally Important Copper/Gold Asset

Corporate Updates

Northern Dynasty Refutes Short Seller Claims

Short Seller’s Report Based on Misstatements, Inaccuracies and

“Anonymous Sources”

Northern Dynasty’s Pebble Project Has Been Assessed by

Independent Experts as a Globally Important Copper/Gold Asset

with Multiple Development Options for Commercial Success

February 17, 2017, Vancouver, BC - Northern Dynasty Minerals Ltd. (TSX: NDM; NYSE

MKT: NAK) ("Northern Dynasty" or the "Company") today responded to misleading criticism

of its Pebble copper and gold project in the February 14, 2017 report by Kerrisdale Capital

Management LLC (“Kerrisdale” or the “Short Seller1”).

The Company and its board have evaluated each of the Short Seller’s claims and believe

they are unfounded, contain numerous errors and unsupported speculation and

demonstrate a lack of understanding of the Company’s business. The Company will

consider and vigorously pursue any and all actions and remedies available to it to protect

the interest of its shareholders.

Summarizing the Short Seller’s Claims

The Short Seller, Kerrisdale, would apparently have you believe that Pebble, as one of the

world’s largest deposits of copper and gold, is worthless despite the fact that mining companies

are profitably mining lower grade ore within a few hundred miles of it as well as at other

operations around the world. The Short Seller would apparently have you believe that Anglo

American, a major mining company which spent some US$600 million on Pebble, but was

ultimately unwilling to spend the full $1.5 billion required to earn a 50% interest in Pebble,

thinks the project is “worthless”. The Short Seller would apparently have you believe that

Pebble’s challenges from the US Environmental Protection Agency (“EPA”) are deserved, or

that it is the first mining project to face regulatory challenges, despite what has been described

by the Wall Street Journal as the EPA’s regulatory “lawlessness” which they based on “sham”

science (January 23, 2017, WSJ). The Short Seller would apparently have you rely on

anonymous hearsay, supposedly from employees of Anglo American, who are making comments

at odds with the public statements of the major mining company’s own senior executives.

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Investors who read the Short Seller’s report should consider the following:

 Kerrisdale stands to realize significant gains in the event that the price of the Company’s

stock declines.

 Kerrisdale is not a mining company and does not disclose any record of success in

mining investments or issuing mining valuation or investment reports. On the contrary,

Kerrisdale has a track record of aggressive short selling and activism. In contrast,

Northern Dynasty’s Pebble team has extensive experience in mining and a formidable

track record of success in developing and operating mines internationally.

 Kerrisdale relies on anonymous co-authors whose mining credentials, if any, Kerrisdale

has not disclosed and who likewise may hold or have held short positions in Northern

Dynasty. Specifically, Kerrisdale has not disclosed if these anonymous authors have any

requisite technical qualifications or practical mining experience to substantiate the claims

of the short report. In contrast, Northern Dynasty publicly files technical reports which

have been certified by named, independent, experienced and reputable Qualified Persons

(as defined by securities laws) who have certified the accuracy and completeness of these

reports. An internationally recognized engineering firm conducted and compiled an

extensive and independent Preliminary Assessment (also referred to as a Preliminary

Economic Assessment, or “PEA”) of the Pebble Project on behalf of Northern Dynasty.

This PEA, published in 2011, showed the project possesses significant value. While the

analyses of this assessment now require updating, it remains a source of much useful

information and is available for download at www.sedar.com. The PEA shows the large

mineral endowment and potential of the Pebble Project.

 Kerrisdale’s short report purports to develop a zero value thesis without requesting or

having had access to the necessary and extensive technical, analytical, geological and

economic information that Northern Dynasty’s Qualified Persons used. No Kerrisdale

personnel have visited the Pebble Project or had discussions with Northern Dynasty’s

technical team or executives.

 Kerrisdale is apparently a troubled organization, which has recently been in the news for

major client and staff defections and alleged senior staff personal misconduct.

Consider the Reaction to the Short Seller’s Report by Independent Analysts2:

From TD Securities:

Following the election of President Trump, [NDM] shares have outperformed the broader base

metal market on the view that the EPA will withdraw its preemptive objections to Pebble,

allowing the project to go through the formal NEPA permitting process. It is important to note

that even prior to Trump's election, the company had announced planned mediation discussions

with the EPA to resolve its dispute over the FACA case. Our view is that EPA will withdraw its

objections, allowing the project to proceed to permitting by late-2017 or early-2018.

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In terms of the project economics, the Short Seller’s report cites that work completed by Anglo

American and third-party engineers indicated that the upfront capital cost of Pebble would be

roughly US$11-13bln. Importantly, no context around the project's size and scale was provided

with the estimate, which we view as misleading. The estimate compares with the US$4.7bln in

upfront capex outlined in Pebble's 2011 PEA for a 200,000tpd operation. We assume US$6.5bln

of capex, with a 10%NAV estimate of US$1.24bln.

Assuming a resolution with the EPA in H1/17, the next critical step, in our view, will be the re-

establishment of a partnership, which management is confident can be achieved this year. We

expect the establishment of a partnership to be followed by the publication of a PFS, which could

target a smaller higher-grade mine development scenario reducing both the capex and

permitting objections.

We maintain our C$5.00 target price and upgrade our rating to SPECULATIVE BUY from Hold

to reflect our return-to-target of 49%.

- Craig Hutchison, P. Eng, TD Securities Inc. February 16, 2017

From Stansberry’s Investment Advisory:

Kerrisdale offered no new technical or scientific evidence. On the call, they labeled themselves

as market generalists with no background in the mining industry. They made vague references to

engineers, but would not disclose their names or credentials.

One of their main arguments is that mining giant Anglo American and other large miners walked

away from the project because Northern Dynasty's resource is worth nothing. We disagree.

We think investors should be very skeptical of investment research that's published by any entity

whose business depends on promoting a position (long or short) after establishing one – whether

it's a hedge fund manager with a history of drug abuse or an established industry titan. The fact

is that having a bunch of money on the line (like Bill Ackman with Herbalife) tends to warp

investors' judgement.

- Stansberry's Investment Advisory. February 2017

From Very Independent Research:

The short seller report was neither a mining technical report nor very much new.

- John Tumazos Very Independent Research, LLC. February 15, 2017

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SETTING THE RECORD STRAIGHT

Pebble is One of the World’s Largest Undeveloped Copper and Gold Resources

The Company will continue this discussion by reconfirming that the Pebble Project is one of the

world’s most important mineral resources, when measured by aggregate contained metals. The

current estimate of these mineral resources at a 0.30% copper equivalent (CuEQ)3 cut-off grade

comprise:

 6.44 billion tonnes in the combined Measured and Indicated categories5 at a grade of

0.40% copper, 0.34 g/t gold, 240 ppm molybdenum and 1.66 g/t silver, containing 57

billion pounds of copper, 70 million ounces of gold, 3.4 billion pounds of molybdenum

and 344 million ounces of silver; and

 4.46 billion tonnes in the Inferred category at a grade of 0.25% copper, 0.26 g/t gold, 222

ppm molybdenum and 1.19 g/t silver, containing 24.5 billion pounds of copper, 37

million ounces of gold, 2.2 billion pounds of molybdenum and 170 million ounces of

silver.

How does this compare to other similar assets?

The Short Seller’s contention that Pebble is a “low grade” deposit is not supported by the data.

Pebble has an average CuEQ grade of 0.71%. The following graph shows Pebble in comparison

to other major producing and non-producing copper projects. It shows that Pebble is in the top

quartile of these deposits when ranked based on CuEQ grade.4

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Comparison of Grades (% CuEQ) of Copper Deposits

Further, the sheer scale of this immense copper/gold asset has attracted major mining company

interest and continues to do so. Pebble is the world’s largest undeveloped copper and gold

resource in terms of contained metal. The deposit hosts the 9th largest copper resource and the 2nd

largest gold resource in the world, as shown in the graphs below. The contained metal of this

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one deposit matches the reported reserves of many of the largest mining companies in the world.

Bringing Pebble into production will be transformative for its shareholders.

Mine Planning and Economic Assessment

Like many large mining projects, the Pebble Project has had various owners, partners and major

investors over the years such as Teck Resources, which owned Pebble before the big exploration

successes at Pebble in 2004 to 2007 massively expanded the resource. Teck Resources continues

to hold a royalty interest in part of the deposit after its 2002 sale of Pebble. With each such party

came different priorities and interests, including with respect to mine development, timelines,

scale and approach. What has never been denied is the potential and quality of this unique asset,

nor Northern Dynasty’s full commitment to work with interested parties to develop it.

Northern Dynasty’s 2011 PEA demonstrated based on certain assumed mining design parameters

(mine plan, mill through put etc.) that Pebble has a potential net present value measured in the

billions of dollars and a mine life of 40 to 80 years. This long-lived mining project did not even

deplete the full Pebble resource. The PEA was prepared by Wardrop Engineering Inc., now an

affiliate of Tetra Tech Inc., an internationally recognized engineering group. The PEA showed

that the commercial potential of a mine at Pebble is good at many commodity price and cost

assumptions. Like all resource extraction projects, commercial viability is largely dependent on

the outlook for the price of the commodity. This is especially true where the outlook has to span

a period measured in decades due to the immense size of the mineral deposit. Northern Dynasty

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believes in the long-term demand for copper and gold and is highly confident that Pebble’s

viability will be demonstrated when it files the final mine design (as it evolves through the

iterative permitting process) after the permitting process has been completed.

Contrary to the Short Seller’s report, no mine planning scenario with a US$13 billion capital

estimate was ever finalized, approved or adopted by Northern Dynasty or Anglo American as its

50% partner in the Pebble Limited Partnership (“Pebble Partnership”). In fact, Pebble

Partnership staff, led by secondees from Anglo American, recognized the flaws with this work

and continued studying development alternatives. Further, a review of a preliminary draft

US$13 billion mine planning scenario by an independent engineering firm commissioned by

Northern Dynasty identified issues with that study and identified savings that reduced the

preliminary capital estimate by US$4 billion. As is well-understood by those with technical

knowledge of the industry, there are a large amount of analyses conducted on very different

assumptions of mine scale and costs to test development scenarios. The conclusions to be drawn

from such work are used to inform mine planning and design and such work is not intended to

represent the “most likely outcome” case for a mine. It is important to note that the Pebble

Partnership has considered hundreds of preliminary mine design scenarios with different design

components, operating parameters and scales.

The 2011 PEA is the only formal published report of the Pebble Project which assesses

economics at a preliminary level.

The 2011 PEA was based on an internal Pebble Partnership study, known as the 2010 Value

Seeking Phase study (“VSP”) that used similar mining parameters as the PEA. The PEA

projected Pebble to have significant asset value. Based on the development alternatives identified

in that study, Anglo American, following completion of the VSP, continued to invest some

US$320 million between 2010 and 2013 in Pebble until its withdrawal from the project in 2013.

Anglo American’s Termination

During the 2013 mining downturn, Anglo American announced that it was reconsidering its

development project pipeline in light of market conditions and was unwilling to invest another

$900 million to earn a 50% interest in the Pebble Project and therefore terminated its earn-in

option. At the time, Anglo American faced well-known capital constraints as a result of the

commodity downturn and negative capital market conditions. In regards to that termination,

newly appointed CEO Mark Cutifani cited a need to manage capital investment on its pipeline of

long dated projects, while publicly referring to Pebble as “a deposit of rare magnitude and

quality”.

Even after its decision to withdraw from the project, Anglo American maintained a positive

outlook on Pebble. “Our views on Pebble as a mining project are unchanged. … We wish the

project well, and express our thanks to those who have supported Pebble…. our decision to

withdraw from the project is the result of an internal prioritisation of the many projects that we

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have in our portfolio,” Anglo American spokesperson James Wyatt-Tilby told Bloomberg on

September 30, 2013.

The Short Seller also claims that the Pebble Project was “pushing the boundaries” of

engineering. That is simply untrue.

While the scale of Pebble engenders a significant, multi-component project, the scale and the

engineering concepts incorporated in its development are not unique and are based on multiple

similar mine developments around the world. Pebble sits at approximately 1,000 feet above sea

level in rolling terrain, 60 miles from tide water that is ice-free 11 months of the year. After

more than a decade of detailed investigation and analysis, no critical engineering issues have

been identified with mine development, ore processing, and infrastructure. Thus, in fact, the

conditions at Pebble are far less challenging than that faced by mines successfully developed in

South America (high elevations, precipitous valleys, limited water supply), the Canadian Arctic

(temperature extremes and severe logistical challenges), southeast Asia (massive precipitation

and excess water balance conditions), and in northwest Alaska (permafrost, logistics challenges

due to short shipping seasons and temperature extremes). The 2011 PEA work was based on

customary and proven mining technologies.

Permitting the Pebble Project

Every mining project has opponents. However, Pebble enjoys considerable support for its efforts

to advance the Pebble Project in Alaska today, including among elected officials, business

interests, and regional and Alaska Native communities. The Short Seller tries to focus attention

on the project’s opponents while deliberately neglecting to mention the significant support the

Pebble Project has had in Alaska, including opposition to what has been widely regarded as

unfair efforts by the EPA to stall the project. Importantly, the State of Alaska was a co-plaintiff

in PLP’s ‘statutory authority’ case against the EPA.

Permitting and developing Pebble will be a multi-year process with multi-decade or multi-

generational payoff. We are entirely committed to advancing the political and public consensus

necessary to support a positive permitting outcome. The Company is advancing a comprehensive

strategy to address EPA actions and stakeholder concerns through potential changes in project

design, enhancing strategic partnerships with key constituencies and ensuring the project delivers

significant benefits to the people of Bristol Bay and Alaska. What is absolutely clear is that many

Alaskans are concerned about the EPA’s pre-emptive actions, and they want the project to be

fully but fairly evaluated through a comprehensive federal/state permitting process under the US

National Environmental Policy Act (“NEPA”).

The Company believes it will have the opportunity to appropriately respond to concerns raised

by regulators, and to demonstrate that its final design will satisfy all federal and state

environmental regulations and permitting requirements.