Northern Star Resources : Investor Presentation - KCGM Site Visit

KCGM Site Visit Presentation

July 2022

Forward Looking Statements, Reserves and Resources

Forward Looking Statements

Northern Star Resources Limited has prepared this announcement based on information available to it. No representation or warranty, express or implied, is made as to the fairness, accuracy, completeness or correctness of the information, opinions and conclusions contained in this announcement. To the maximum extent permitted by law, none of Northern Star Resources Limited, its directors, employees or agents, advisers, nor any other person accepts any liability, including, without limitation, any liability arising from fault or negligence on the part of any of them or any other person, for any loss arising from the use of this announcement or its contents or otherwise arising in connection with it.

This announcement is not an offer, invitation, solicitation or other recommendation with respect to the subscription for, purchase or sale of any security, and neither this announcement nor anything in it shall form the basis of any contract or commitment whatsoever.

This announcement may contain forward looking statements that are subject to risk factors associated with gold exploration, mining and production businesses. It is believed that the expectations reflected in these statements are reasonable but they may be affected by a variety of variables and changes in underlying assumptions which could cause actual results or trends to differ materially, including but not limited to price fluctuations, actual demand, currency fluctuations, drilling and production results, Resource or Reserve estimations, loss of market, industry competition, environmental risks, physical risks, legislative, fiscal and regulatory changes, economic and financial market conditions in various countries and regions, political risks, project delay or advancement, approvals and cost estimates.

ASX Listing Rules Disclosures

This announcement contains current estimates of Northern Star's KCGM Operations' Ore Reserves and Mineral Resources. The information in this announcement that relates to the current Ore Reserves and Mineral Resources, and production targets of Northern Star has been extracted from the ASX release by Northern Star entitled "Resources, Reserves and Exploration Update" dated 3 May 2022 available at www.nsrltd.comand www.asx.com("Northern Star Announcement").

Northern Star confirms that it is not aware of any new information or data that materially affects the information included in the Northern Star Announcement other than changes due to normal mining depletion during the four month period to 31 July 2022, and, in relation to the estimates of Northern Star's KCGM Operations' Ore Reserves and Mineral Resources, that all material assumptions and technical parameters underpinning the estimates in the Northern Star Announcement continue to apply and have not materially changed. Northern Star confirms that the form and context in which the Competent Person's findings are presented have not been materially modified from that announcement.

Assumptions made in relation to the Ore Reserves and Mineral Resources underpinning the production targets in that announcement are (in summary):

• Current operational capital and operating cost structures,
• Current mining and metallurgical performance,
• The gold price, exchange rate, dilution allowance and mining recovery rates are as set out in each prior public report referred to in ASX Listing Rule 5.19 disclosures, and
• 5 year gold production profiles are based on 100% current JORC compliant Ore Reserves.

Rounding is applied in this presentation for the percentage comparisons and for the 31 March 2022 Ore Reserves and Mineral Resources figures.
Unless stated otherwise, all currency conversions in this document have been converted at a currency of A$/US$ conversion rate of $0.75.
Authorised to release to the ASX by Stuart Tonkin, Managing Director & CEO.	2

Acknowledging our landowners

Northern Star would like to acknowledge and pay our respects to Traditional Owner groups whose land we are privileged to work on, and whose input and guidance we seek and value within the operation of our business.

We acknowledge their strong and special physical and cultural connections to their ancestral lands.

Whadjuk Noongar

The Wiluna Martu

Kultju

Tjiwarl

Maduwongga

Marlinyu Ghoorlie

Warlpiri and Yapa

Nyalpa Pirniku

Darlot

Kakarra

Wajarri Yamatji

Northern Star would like to acknowledge Doyon Limited, whose traditional lands surround our Pogo Operation in Alaska, USA

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KCGM OPERATIONS

KCGM: Rich in history

• The 1893 gold rush (initiated by Paddy Hannan), resulted in the discovery of the Golden Mile
• In 1903 there were 49 operating mines, 100 headframes and more than 3,000km of underground workings on the Golden Mile
• In the 1980's, consolidation aspirations to a single company failed
• By 1989, the entire area was combined and Kalgoorlie Consolidated Gold Mines Pty Ltd (KCGM) was formed, a joint venture between Normandy Australia Ltd and Homestake Gold of Australia Ltd
• All underground operations were phased out except for the Mt Charlotte Underground Mine, and the Fimiston and Gidji processing plants were constructed
• In February 2021, following merger of Northern Star and Saracen Mineral Holdings Ltd, KCGM now 100% Australian-owned for the first time in its 31-year history

Produced +65Moz gold since first production in 1893

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