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Minnesota Issues Permit to Mine for PolyMet Copper-Nickel Mine

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Dam safety, water appropriations and other final permits also issued by
DNR

Poly Met Mining, Inc., a wholly-owned subsidiary of PolyMet Mining Corp.
(together "PolyMet" or the "company") TSX: POM; NYSE American: PLM,
reports it has received its Permit to Mine from the State of Minnesota,
a crucial permit for construction and operation of the NorthMet Project
in northeastern Minnesota.

PolyMet's Permit to Mine is the first non-ferrous mining permit to be
issued in the State of Minnesota. The Department of Natural Resources
also issued all other permits for which the company has applied
including dam safety, water appropriations, takings, and public waters
work permits, along with Wetlands Conservation Act approval. These
permits were issued after the company demonstrated that its designs meet
strict state environmental standards and at the conclusion of an
extensive public input process.

"We look forward to building and operating a modern mine and developing
the minerals that sustain and enhance our modern world," said Jon
Cherry, president and CEO. "Responsibly developing these strategic
minerals in compliance with these permits while protecting Minnesota's
natural resources is our top priority as we move forward."

PolyMet aims to be the first to commercially produce copper and nickel,
in addition to platinum, palladium, gold and cobalt, from the
world-class Duluth Complex in the Iron Range's historic mining district.

The Permit to Mine authorizes the company to build and operate open pit
mining operations that are expected to yield approximately 1.2 billion
pounds of copper, 170 million pounds of nickel, 6.2 million pounds of
cobalt and 1.6 million troy ounces of precious metals over a 20-year
mine life. The 225 million tons of ore permitted for extraction
represents roughly one third of the NorthMet 649-million-ton Measured
and Indicated Resource as described in the company's 2018 National
Instrument 43-101 Technical Report, which is filed under the company's
SEDAR and EDGAR profiles.

Cherry said the Permit to Mine provides a level of certainty for which
the community and investors have been waiting. "It is a victory for Iron
Range families who have steadfastly supported us and who depend on and
will benefit from the hundreds of jobs that construction and operations
will create and support for years to come. This certainty will also
allow the company to move forward with financing and final engineering
designs."

Meanwhile, the Minnesota Pollution Control agency says it will make
final air and water permit decisions before the end of the year; the
federal Record of Decision and wetlands permit from the U.S. Army Corps
of Engineers are expected to follow thereafter.

In relation to the permits issued today, site preparation and
rehabilitation of the former LTV Steel Mining Company processing
facilities, which the company acquired in 2005-06, will occur through
the winter and early spring as the company prepares to modernize those
facilities to process ore for the NorthMet project. The bulk of work
will start with the 2019 construction season and is expected to be
approximately 24-30 months and require about two million construction
hours.

"We owe tremendous gratitude to our shareholders, Iron Range supporters,
labor groups and those throughout the state who have stood by this
project and this process. We are grateful for the trust they and our
investors have put in us and the state to do this right," Cherry said.
"We also appreciate and respect the careful and thorough role the state
has played throughout the public permitting process."

An economic impact study by the University of Minnesota-Duluth Labovitz
School of Business and Economics estimated the project will yield more
than $500 million annually in economic benefits for St. Louis County and
generate 660 indirect jobs in addition to the 360 full-time workers the
company is expected to employ.

Permit details and status can be found on the state's website at www.polymet.mn.gov.

This release has been reviewed and approved by Herb Welhener, an
Independent Qualified Person within the meaning of National Instrument
43-101.

About PolyMet

PolyMet Mining Corp. (www.polymetmining.com)
is a publicly traded mine development company that owns 100 percent of
Poly Met Mining, Inc., a Minnesota corporation that controls 100 percent
of the NorthMet copper-nickel-precious metals ore body through a
long-term lease, and owns 100 percent of the Erie Plant, a large
processing facility located approximately six miles from the ore body in
the established mining district of the Mesabi Iron Range in northeastern
Minnesota. Poly Met Mining, Inc. has completed its Definitive
Feasibility Study. The NorthMet Final Environmental Impact Statement was
published in November 2015, preparing the way for decisions on permit
applications. NorthMet is expected to require approximately two million
hours of construction labor, create approximately 360 long-term jobs
directly, and generate a level of activity that will have a significant
multiplier effect in the local economy.

PolyMet Disclosures

This news release contains certain forward-looking statements
concerning anticipated developments in PolyMet's operations in the
future. Forward-looking statements are frequently, but not always,
identified by words such as "expects," "anticipates," "believes,"
"intends," "estimates," "potential," "possible," "projects," "plans,"
and similar expressions, or statements that events, conditions or
results "will," "may," "could," or "should" occur or be achieved or
their negatives or other comparable words. These forward-looking
statements may include statements regarding the ability to receive
environmental and operating permits, job creation, and the effect on the
local economy, or other statements that are not a statement of fact.
Forward-looking statements address future events and conditions and
therefore involve inherent known and unknown risks and uncertainties.
Actual results may differ materially from those in the forward-looking
statements due to risks facing PolyMet or due to actual facts differing
from the assumptions underlying its predictions.

PolyMet's forward-looking statements are based on the beliefs,
expectations and opinions of management on the date the statements are
made, and PolyMet does not assume any obligation to update
forward-looking statements if circumstances or management's beliefs,
expectations and opinions should change.

Specific reference is made to risk factors and other considerations
underlying forward-looking statements discussed in PolyMet's most
recent Annual Report on Form 40-F for the fiscal year ended December 31,
2017, and in our other filings with Canadian securities authorities and
the U.S. Securities and Exchange Commission.

The Annual Report on Form 40-F also contains the company's mineral
resource and other data as required under National Instrument 43-101.

The TSX has not reviewed and does not accept responsibility for the
adequacy or accuracy of this release.

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