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Avalon to Pursue Staged Development Approach for the Separation Rapids Lithium Project, Kenora, ON

Corporate Updates

NEWS RELEASE

April 25, 2017 No. 17-08

Avalon to Pursue Staged Development Approach for the

Separation Rapids Lithium Project, Kenora, ON

Toronto, ON – Avalon Advanced Materials Inc. (TSX: AVL and OTCQX: AVLNF) (“Avalon” or the

“Company”) is pleased to announce that it will be pursuing a staged development approach for the

Separation Rapids Lithium Project involving initial construction of a demonstration scale process

plant in the Kenora area. This approach will satisfy the need to produce large volume trial samples

of the Company’s various lithium products for its customers. The facility would incorporate capacity

both for lithium mineral concentration and for piloting Avalon’s proprietary hydrometallurgical

process to produce lithium battery materials including both lithium hydroxide and carbonate from

petalite concentrates.

The Company’s Preliminary Economic Assessment (“PEA”), disclosed in the news release dated

September 27, 2016 , outlined a scenario for economic production of a high purity lithium hydroxide

product from its concentrate of the lithium mineral petalite using an innovative new

hydrometallurgical technique. The Company developed a proprietary flotation process in 1998-99 for

concentrating the petalite which was further optimized during the 2016 pilot plant program and

incorporated into the PEA model. This petalite concentrate can also be used as a direct input into

high strength and thermal shock resistant specialty glass and ceramics products. Surging demand

for lithium from battery makers is disrupting traditional supply sources for innovators in the glass

industry, which still accounts for 30% of global lithium demand as reported by the USGS. This

creates an opportunity for new producers of high purity lithium minerals to fill the growing supply

gap. Avalon’s high purity petalite concentrate is ideally suited to meet this need.

In addition, under the non-binding Letter of Intent entered into with Lepidico Ltd., disclosed in the

Company’s news release dated February 6, 2017, the Company has a potential buyer for a lepidolite

mineral concentrate which will also be produced from the Company’s demonstration plant. Lepidico

has disclosed its desire to gain ready access to this high grade lithium product by co-locating its

planned lithium carbonate demonstration plant facility with Avalon’s demonstration plant in the

Kenora area.

Recent work by Avalon has determined that a phase 1 demonstration plant designed to process 11

tonnes of ore per hour (90,000 tpa) could satisfy the initial requirements of Lepidico and potential

glass customers, as well as provide sufficient feed for the lithium hydroxide hydrometallurgical

process circuit in the same facility. It will also provide facilities for confirming other by-product

opportunities including feldspar. Lastly it will demonstrate the efficiency of Avalon’s innovative

processes and confirm the ability to scale up and expand this technology in an operational

130 Adelaide St. W., Suite 1901, Toronto, ON M5H 3P5

Tel: (416) 364-4938 Fax: (416) 364-5162

[email protected]

www.AvalonAdvancedMaterials.com

environment. Preliminary estimates of the capital requirements for the demonstration plant are in the

order of US$25 million, which the Company expects to finance with the support of the customers for

its lithium products.

The Company now plans to proceed with an update of its 2016 PEA Technical Report to reflect the

potential for petalite and lepidolite lithium concentrate production in addition to value-added lithium

battery materials, using the staged development approach. This update will provide a more detailed

cost estimate for the phase 1 demonstration plant and an update on the lithium battery materials

price assumptions to reflect reports of recent price appreciation for both lithium carbonate and

lithium hydroxide. The independent Qualified Persons from Micon International Limited that

supervised the preparation of the Company’s 2016 PEA have agreed to provide the technical

support for this updated study.

A suitable industrial property with all required infrastructure including grid power, natural gas and rail

access has already been identified in the Kenora area. With the availability of an industrial site, the

Company anticipates that an efficient permitting process can be applied which could see the

demonstration plant commence operations in less than two years.

Avalon’s Senior Vice President for Metallurgy and Technology Development, Dave Marsh

commented, “This staged approach has the potential to reduce overall investment risk for the

Separation Rapids Project by establishing a small-scale demonstration plant to confirm the

commercial viability of our innovative lithium processing technology before proceeding to a full-scale

operation. This facility will also have the capacity to generate large volume trial samples of our

lithium products for our customers, particularly consumers of petalite in the glass industry.”

Avalon’s President, Don Bubar, added, “Getting a lithium battery materials demonstration plant up

and running in the Kenora area will establish northwestern Ontario as a new regional centre for the

production of the critical materials needed for Canada’s growing cleantech supply chains.”

The technical information included in this news release has been reviewed and approved by the

Company’s Senior Vice President, Metallurgy and Technology Development, Mr. David Marsh,

FAusIMM (CP), and Donald S. Bubar, P.Geo. both Qualified Persons under NI 43-101.

About Avalon Advanced Materials Inc.

Avalon Advanced Materials Inc. is a Canadian mineral development company specializing in niche

market metals and minerals with growing demand in new technology. The Company has three

advanced stage projects, all 100%-owned, providing investors with exposure to lithium, tin and

indium, as well as rare earth elements, tantalum, niobium, and zirconium. Avalon is currently

focusing on its Separation Rapids Lithium Project, Kenora, ON and its East Kemptville Tin-Indium

Project, Yarmouth, NS. Social responsibility and environmental stewardship are corporate

cornerstones.

For questions and feedback, please e-mail the Company at [email protected], or phone Don

Bubar, President & CEO at 416-364-4938.

This news release contains “forward-looking statements” within the meaning of the United States Private Securities Litigation R eform Act

of 1995 and applicable Canadian securities legislation. Forward-lo oking statements include, but are not limited to, the stateme nt that

Avalon will be pursuing a staged development approach for the Separation Rapids Lithium Project, that this approach will satisfy the need

to produce large volume trial samples, that the facility wo uld incorporate capacity both for lithium mineral concentration and for piloting

Avalon’s proprietary hydrometallurgical process to produce lithium battery mate rials including both lithium hydroxide and carbo nate from

petalite concentrates, that the Company’s petalite concentrate can also be used as a direct input into high strength and therma l shock

resistant specialty glass and ceramics products , that surging demand for lithium from battery makers is disrupting traditional supply

sources for innovators in the glass indus try, and this creates an opportunity for new producers of high purity lithium minerals to fill the

growing supply gap, that Avalon’s high purity petalite concentrate is ideally suited to meet this need, that the Company has a potential

buyer for a lepidolite mineral concentrate which will also be produced from the Company’s demonstration plant, that Lepidico i s co-

locating its planned lithium carbonate demonstration plant facility with Avalon’s demonstration plant in the Kenora area, that the plant

could satisfy the initial requirements of Lepidico and potential gl ass customers, as well as provide sufficient feed for the li thium hydroxide

hydrometallurgical process circuit in the same facility, that the plant will also provide facilities for confirming other by-p roduct opportunities

including feldspar, that it will demonstrate the efficiency of Avalon’s innovative processes and confirm the ability to scale up and expand

this technology in an operational environment, that preliminary estimates of the capital requirements for the demonstration plant are in the

order of US$25 million, and that the Company expects to finance this with the suppor t of the customers for its lithium products , that the

Company now plans to proceed with an update of its 2016 PEA Technica l Report, that this update will provide a more detailed cos t

estimate for the phase 1 demonstration plant and an update on the lit hium battery materials price assumptions to reflect report s of recent

price appreciation for both lithium carbonate and lithium hydroxide, that with the availability of an industrial site, the Comp any anticipates

that an efficient permitting process can be applied which could see the demonstration plant commence operations in less than tw o years,

that a staged approach has the potential to reduce overall investm ent risk for the Separation Rapids Project and that lithium battery

materials demonstration plant in the Kenora area will establish no rthwestern Ontario as a new re gional centre for the productio n of the

critical materials needed for Canada’s growing cleantech supply chains. Generally, these forward- looking statements can be iden tified by

the use of forward-looking terminology such as “potential”, “scheduled”, “anticipates”, “continues”, “expects” or “does not exp ect”, “is

expected”, “scheduled”, “targeted”, “planned”, or “believes”, or variations of such words and phrases or state that certain actions, events or

results “may”, “could”, “would”, “might” or “will be” or “will not be” taken, reached or result, “will occur” or “be achieved”. Forward-looking

statements are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity,

performance or achievements of Avalon to be materially different fr om those expressed or implied by such forward-looking statem ents.

Forward-looking statements are based on assumptions management belie ves to be reasonable at the time such statements are made.

Although Avalon has attempted to identify important factors that c ould cause actual results to diff er materially from those con tained in

forward-looking statements, there may be other factors that caus e results not to be as anticipated, estimated or intended. Fact ors that

may cause actual results to differ materially from expected re sults described in forward-looking statements include, but are no t limited to

market conditions, and the possibility of cost overruns or unant icipated costs and expenses as well as those risk factors set o ut in the

Company’s current Annual Information Form, Management’s Discussi on and Analysis and other disclosure documents available under

the Company’s profile at www.SEDAR.com. There can be no assurance that such statements will prove to be accurate, as actual results

and future events could differ materially from those anticipated in such statements. Such forward-looking statements have been provided

for the purpose of assisting investors in understanding the Com pany’s plans and objectives and may not be appropriate for other

purposes. Accordingly, readers should not place undue reliance on forward-looking st atements. Avalon does not undertake to upda te any

forward-looking statements that are contained herein, except in accordance with applicable securities laws.