Rio Tinto PLC

Report Publication Announcement • Feb 28, 2019

National Storage Mechanism | Additional information

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RNS Number : 3535R

Rio Tinto PLC

28 February 2019

Changes to Pilbara Mineral Resources 

28 February 2019

On 28 February 2019 Rio Tinto announced to the Australian Securities Exchange (ASX) increases in Mineral Resources at its Pilbara iron ore operations in Western Australia.

This announcement was made in accordance with the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves, 2012 (JORC Code) and the ASX Listing Rules. A copy of the full announcement is available on Rio Tinto's website at www.riotinto.com/reservesandresources.

In 2018, technical work was conducted across multiple deposits with over 700,000 m drilled. A portion of this has contributed to the significant changes in the following Mineral Resources:

	Mineral Resources
Music Hall / Old Vic	First reporting of Mineral Resources for Music Hall and Old Vic has added to Hamersley Iron: ·      225 Mt of Marra Mamba ore; and ·      58 Mt of Detrital ore.
Western Hill	Update to the Mineral Resources for Western Hill has added to the Robe River JV: ·      112 Mt of Brockman ore; ·      42 Mt of Brockman Process ore; and ·      12 Mt of Detrital ore.

Changes in Mineral Resources estimates at Rio Tinto's Pilbara iron ore operations between 31 December 2017 and 31 December 2018 are as follows:

	Tonnage (Mt)
2017 Mineral Resources	22,538
Music Hall / Old Vic increases	283
Western Hill increases	166
Net amount of other changes	332
2018 Mineral Resources	23,319

Rio Tinto's Mineral Resources are set out in full in its annual report released on 28 February 2019. Mineral Resources are reported as dry in-situ tonnages in addition to Ore Reserves.

Contacts

media.enquiries@riotinto.com 

riotinto.com 

Follow @RioTinto on Twitter

Media Relations, United Kingdom Illtud Harri M +44 7920 503 600 David Outhwaite T +44 20 7781 1623 M +44 7787 597 493 Media Relations, Americas Matthew Klar T +1 514 608 4429 Media Relations, Asia Grant Donald T +65 6679 9290 M +65 9722 6028	Media Relations, Australia Jonathan Rose T +61 3 9283 3088 M +61 447 028 913 Matt Chambers T +61 (0) 3 9283 3087 M +61 433 525 739 Jesse Riseborough T +61 8 6211 6013 M +61 436 653 412
Investor Relations, United Kingdom John Smelt T +44 20 7781 1654 M +44 7879 642 675 David Ovington T +44 20 7781 2051 M +44 7920 010 978 Nick Parkinson T +44 20 7781 1552 M +44 7810 657 556	Investor Relations, Australia Natalie Worley T +61 3 9283 3063 M +61 409 210 462 Rachel Storrs T +61 3 9283 3628 M +61 417 401 018
Rio Tinto plc 6 St James's Square London SW1Y 4AD United Kingdom T +44 20 7781 2000 Registered in England No. 719885	Rio Tinto Limited Level 7, 360 Collins Street Melbourne 3000 Australia T +61 3 9283 3333 Registered in Australia ABN 96 004 458 404

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