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Excelsior Mining Announces Closing of First Tranche of Private Placement

Financings

Not for dissemination or distribution in the United States or through U.S. newswire services.

NEWS RELEASE

Excelsior Mining Announces Closing of First Tranche of Private Placement

December 21, 2017

Excelsior Mining Corp. (TSX: MIN) (FSE: 3XS) (OTCQX: EXMGF) ("Excelsior" or the “Company”) is

pleased to announce that it has closed the first tranche of its non-brokered private placement (the

“Offering”) (see press releases dated December 11, 2017 and December 19, 2017). The Company has

issued 22,168,000 common shares at a price of C$1.00 per common share for gross proceeds of

C$22,168,000 (approximately US$17.2 million). The second and final tranche of the Offering consists of

an additional 16,467,200 common shares at a price of C$1.00 for gross proceeds of C$16,467,200

(approximately US$12.8 million). The second tranche will be subscribed for by an affiliate of Greenstone

Resources L.P. (“Greenstone”) and is expected to close in the first half of January, 2018 after customary

closing conditions are satisfied.

“The Offering was oversubscribed with strong support from major North American, UK and European

based institutional investors alongside Greenstone, the Company ’s major shareholder,” said, President

& CEO, Stephen Twyerould. “With this financing, pre-construction activities at Gunnison will continue on

pace as we prepare to seamlessly transition to well-field construction as planned, upon the receipt of the

final permit and project finance, expected in the New Year. Bac ked by stakeholders that share our

commitment for technical excellenc e and environmental stewardsh ip, we remain on-track for copper

production in 2018.”

The Offering is non-brokered; however, Clarksons Platou Securities AS and Tamesis Partners LLP were

engaged by Excelsior to act as finders in connection with the Offering and were paid finder’s fees on the

first tranche of the Offering. The net proceeds of the Offering will be used for the development,

construction and maintenance of the Company’s Gunnison Copper P roject, including the acquisition of

long lead items, and for working capital requirements. All comm on shares issued in the first tranche of

the Offering are subject to a statutory four month hold period that expires on April 22, 2018.

The securities being offered hereby have not been, nor will the y be, registered under the United States

Securities Act of 1933, as amended and may not be offered or so ld in the United States or to, or for the

account or benefit of, U.S. persons absent registration or an a pplicable exemption from the registration

requirements. This news release will not constitute an offer to sell or the solicitation of an offer to buy nor

will there be any sale of the securities in any State in which such offer, solicitation or sale would be

unlawful.

About Excelsior Mining

Excelsior Mining “ The Copper Solution Company” is a mineral exploration and development company

that is advancing the Gunnison Copper Project in Cochise County , Arizona. The project is an advanced

staged, low cost, environmentally friendly in-situ recovery copper extraction project that is scheduled for

commercial production in 2018. The 2016 Feasibility Study projected an after-tax NPV of US$ 807 million

and IRR of 40% using a US$ 2.75 copper price and a 7.5 discount rate.

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Excelsior’s technical work on the Gunnison Copper Project is supervised by Stephen Twyerould, Fellow

of AUSIMM, President & CEO of Excelsior and a Qualified Person as defined by National Instrument 43-

101. Mr. Twyerould has reviewed and approved the technical information contained in this news release.

Additional information about the Gunnison Copper Project can be found in the technical report filed on

SEDAR at www.sedar.com entitled: “Gunnison Copper Project, NI 4 3-101 Technical Report, Feasibility

Study” dated effective December 17, 2016.

For more information on Excelsior, please visit our website at www.excelsiormining.com.

ON BEHALF OF THE EXCELSIOR BOARD

"Stephen Twyerould"

President & CEO

For further information regarding this press release, please contact:

Excelsior Mining Corp.

Concord Place, Suite 300, 2999 North 44th Street, Phoenix, AZ, 85018.

JJ Jennex, Vice President, Corporate Affairs

T: 604-681-8030 x240

E: [email protected]

www.excelsiormining.com

Cautionary Note Regarding Forward-Looking Information

This news release contains "forward-looking information" concerning anticipated developments and events that may occur in the future. Forward

looking information contained in this news release includes, but is not limited to, statements with respect to: (i) information pertaining to the terms

of the Offering, (ii) the closing of the second tranche of the Offering, (iii) the timelines for completion of permitting, commencement of construction

and commercial production, (iii) the use of pr oceeds from the Offering, and (iv) the ability to mine the Gunnison Project using in-situ recovery

mining techniques.

In certain cases, forward-looking information can be identified by the use of words such as "plans", "expects" or "does not expect", "is expected",

"budget", "scheduled", "estimates", "forecasts ", "intends", "anticipates" or "does not anticipate", or "believes", or variation s of such words and

phrases or state that certain actions, events or results "may ", "could", "would", "m ight" or "will be taken", "occur" or "be ac hieved" suggesting

future outcomes, or other expectations, be liefs, plans, objectives, assumptions, intent ions or statements about future events o r performance.

Forward-looking information contained in th is news release is based on certain factor s and assumptions regarding, among other t hings, the

estimation of mineral resources and mineral reserves, the realization of resource and reserve estimates, copper and other metal prices, the

timing and amount of future development expenditures, the estimation of initial and sustaining capital requirements, the estimation of labour and

operating costs, the availability of necessary financing and materials to continue to develop and construct the Gunnison Project in the short and

long-term, the progress of development activities, the receipt of necessary regulatory approvals, the completion of the permitt ing process, the

estimation of insurance coverage, and assumptions with respect to currency fluctuations, environmental risks, title disputes or claims, and other

similar matters. While the Company considers these assumptions to be reasonable based on information currently available to it, they may prove

to be incorrect.

Forward looking information involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance

or achievements of the Company to be materially different from any future results, performance or achievements expressed or imp lied by the

forward-looking information. Such factors include risks inherent in the exploration an d development of mineral deposits, including risks relating

to changes in project parameters as plans continue to be redefi ned including the possibility that mining operations may not com mence at the

Gunnison Project, risks relating to variations in mineral resources and reserves, grade or recovery rates resulting from curren t exploration and

development activities, risks relating to the ability to access infrastructure, risks relating to changes in copper and other c ommodity prices and

the worldwide demand for and supply of copper and related products, risks related to increased competition in the market for copper and related

products and in the mining industry generally, risks related to curr ent global financial conditions, uncertainties inherent in the estimation of

mineral resources, access and supply risks, reliance on key per sonnel, operational risks inherent in the conduct of mining acti vities, including

the risk of accidents, labour disputes, increases in capital and operating costs and the risk of delays or increased costs that might be encountered

during the development process, regulatory risks, including risks relating to the acqui sition of the necessary licenses and per mits, financing,

capitalization and liquidity risks, including the risk that the financing necessary to fund the exploration and development activities at the Gunnison

Project may not be available on satisfactory terms, or at all, risks related to disputes concerning property titles and interest, environmental risks

and the additional risks identified in the “Risk Factors” section of the Company’s reports and filings with applicable Canadian securities regulators.

Although the Company has attempted to identify important factors t hat could cause actual actions, events or results to differ m aterially from

those described in forward-looking information, there may be other factors that cause actions, events or results not to be as anticipated, estimated

or intended. Accordingly, readers should not place undue reliance on forward- looking information. The forward-looking informati on is made as

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of the date of this news release. Except as required by applicable securi ties laws, the Company does not undertake any obligati on to publicly

update or revise any forward-looking information.