Antofagasta : Financial Reporting Document

Developing mining for a better future

2023

Half Year Results

10 August 2023

Cautionary statement

This presentation has been prepared by Antofagasta plc. By reviewing and/or attending this presentation you agree to the following conditions:

This presentation contains forward-looking statements. All statements other than historical facts are forward-looking statements. Examples of forward- looking statements include those regarding the Group's strategy, plans, objectives or future operating or financial performance; reserve and resource estimates; commodity demand and trends in commodity prices; growth opportunities; and any assumptions underlying or relating to any of the foregoing. Words such as "intend", "aim", "project", "anticipate", "estimate", "plan", "believe", "expect", "may", "should", "will", "continue" and similar expressions identify forward-looking statements. Forward-looking statements involve known and unknown risks, uncertainties, assumptions and other factors that are beyond the Group's control. Given these risks, uncertainties and assumptions, actual results could differ materially from any future results expressed or implied by these forward-looking statements, which apply only as of the date of this presentation. Important factors that could cause actual results to differ from those in the forward-looking statements include: global economic conditions; demand, supply and prices for copper; long-term commodity price assumptions, as they materially affect the timing and feasibility of future projects and developments; trends in the copper mining industry and conditions of the international copper markets; the effect of currency exchange rates on commodity prices and operating costs; the availability and costs associated with mining inputs and labour; operating or technical difficulties in connection with mining or development activities; employee relations; litigation; and actions and activities of governmental authorities, including changes in laws, regulations or taxation. Except as required by applicable law, rule or regulation, the Group does not undertake any obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Certain statistical and other information about Antofagasta plc included in this presentation is sourced from publicly available third party sources. Such information presents the views of those third parties and may not necessarily correspond to the views held by Antofagasta plc.

This presentation is for information purposes only and does not constitute an offer to sell or the solicitation of an offer to buy shares in Antofagasta plc or any other securities in any jurisdiction. Further it does not constitute a recommendation by Antofagasta plc or any other person to buy or sell shares in Antofagasta plc or any other securities.

Past performance cannot be relied on as a guide to future performance.

Antofagasta plc | 2023 Half Year Results

2

Agenda

1

Overview

2

Financial review

3

Sustainability performance

4

Growth opportunities

Antofagasta plc | 2023 Half Year Results

3

Overview

H1 2023 Results

Iván Arriagada | Chief Executive Officer

Image: Los Pelambres' Integrated Remote Operations Centre in Santiago, inaugurated in H1 2023.

4

Highlights: H1 2023

Earnings per share increase by 27%

Safety performance		EBITDA
0 Fatalities
	$1.3bn
-43% High Potential Incidents
	(+8%)
-30% Lost Time Injury Frequency Rate
Copper production	Earnings per share
+10%	+27%
(295.5kt)	(33.5 cents)

Antofagasta plc | 2023 Half Year Results

Revenue

$2.9bn

(+14%)

160 litres/second

Desalinated water supply Los

Pelambres (June 2023 average, 40% of capacity)

5