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Rio Tinto’s 2017 annual report, released to the market today, includes significant changes in estimates of Ore Reserves and Mineral Resources at the Boron open pit mine in Boron, California (RTB Boron), compared to the previous estimate in the 2016 annual report.
The updated Ore Reserves and Mineral Resources are reported in accordance with the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves, 2012 (JORC Code) and the ASX Listing Rules. Supporting information relating to the changes is set out in this release and its appendix. Ore Reserves and Minerals Resources are quoted on a 100 per cent basis. Rio Tinto’s interest is 100 per cent.
RTB Boron Ore Reserves have decreased by 6 Mt, from 22 Mt to 16 Mt.
Accordingly, RTB Boron Mineral Resources exclusive of Ore Reserves have increased by 8.5 Mt, from 0 Mt to 8.5 Mt.
The reduction in Ore Reserves applies to the body of calcium borate ore types at the site. This decrease in Ore Reserves reflects a reassessment of the study support level of processing assumptions following independent technical review, leading to updated asessments of processing flowsheet options, and likely economics. The the sodium borate Ore Reserves, being majority of the Ore Reserves at the site, are unaffected.
Following this write back of Ore Reserves the operating life of RTB Boron has been reduced by 7 years and is anticipated to run until 2042.
Calcium borate extraction options and economics will be reviewed in the future as required subject to market opportunities and updated technical asessments.
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With the exception of the use of cookies, Rio Tinto generally does not seek to collect personal data through this website. However if you choose to provide personal data to Rio Tinto through this website (for example, by sending us an email), we will process that personal data to answer your query and if relevant, to manage our business relationship with you or your company. We won't process that personal data for other purposes except where required to meet our legal obligations or otherwise as authorised by law and notified to you.
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With your consent, our website uses cookies to distinguish you from other users of our website. This helps us to provide you with a good experience when you browse our website and also allows us to improve our site. A cookie is a small file of letters and numbers that we store on your browser or the hard drive of your computer if you agree. Cookies contain information that is transferred to your computer's hard drive.
As some data privacy laws regulate IP addresses and other information collected through the use of cookies as personal data, Rio Tinto’s processing of such personal data needs to comply with its Data Privacy Standard (see Part 1 of our Privacy Policy), and also applicable data privacy laws.
With the exception of the use of cookies (explained below), Rio Tinto generally does not seek to collect personal data through this website. However if you choose to provide personal data to Rio Tinto through this website (for example, by sending us an email), we will process that personal data to answer your query and if relevant, to manage our business relationship with you or your company. We won't process that personal data for other purposes except where required to meet our legal obligations or otherwise as authorised by law and notified to you.
Part 1 of this Privacy Policy contains the Rio Tinto Data Privacy Standard, which provides an overview of Rio Tinto’s approach to personal data processing. There is additional information in the appendices to the Data Privacy Standard, including information about disclosures, trans-border data transfers, the exercise of data subject rights and how to make complaints or obtain further information relating to Rio Tinto’s processing of your personal data.
If you choose to subscribe to our media releases or other communications, you can unsubscribe at any time (by following the instructions in the email or by contacting us at digital.comms@riotinto.com).
With your consent, our website uses cookies to distinguish you from other users of our website. This helps us to provide you with a good experience when you browse our website and also allows us to improve our site.
A cookie is a small file of letters and numbers that we store on your browser or the hard drive of your computer if you agree. Cookies contain information that is transferred to your computer's hard drive.
As some data privacy laws regulate IP addresses and other information collected through the use of cookies as personal data, Rio Tinto’s processing of such personal data needs to comply with its Data Privacy Standard (see Part 1 of this Privacy Policy), and also applicable data privacy laws.
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