1 June 2016: Anglo American is investigating possible fast-track implementation options at its Los Bronces site based on economic value identified in an extensive Grade Engineering Advanced concept study.

This article was published in CRC ORE News - June 2016

Grade Engineering at Minera San Cristobal, Bolivia

ore
  Anglo American and CRC ORE has been working jointly to redesign a new long term mine plan taking into account Grade Engineering principles.

1 June 2016: Anglo American is investigating possible fast-track implementation options at its Los Bronces site based on economic value identified in an extensive Grade Engineering Advanced concept study.

Site trials at Los Bronces have now progressed to technically validate the Grade Engineering opportunities identified in the concept study during which CRC ORE, the site team at Los Bronces and COMET Strategy worked jointly to redesign a new long term mine plan taking into account Grade Engineering principles.

CRC ORE Technical Specialists have spent significant time in Chile working with the site team and the mobile equipment operators.
Three production blast trials have been conducted. These showed that combining preferential grade by size and differential blasting improves Response Ranking numbers by 13% to 26%, noting that this result is highly dependent on underlying Ranking Responses and grade distributions. The result confirmed that grade by size is the primary value driver at Los Bronces, with differential blasting being a secondary driver. The summary outcomes of the three trials were:

  • Blast 1 was conducted in June 2015 with 33kt screened. The screening results produced a Response Ranking of 87. The minus 1 inch screened material represented 27% of the original mass, with an upgrade factor of 1.7 from the head grade.
  • Blast 2 was a differential blast which was done by only varying the charging in the high and low grade zones within the blast block. There was no change to the standard pattern design or any re-drilling conducted on the bench. Based on the screening results, the coarse low grade material had a blast P80 of ~160mm and the fine high grade material had a blast P80 of ~81mm. Results from the blast trial indicate that a good degree of separation was achieved between high grade and low grade material through differential blasting. An Overall Preferential Grade by Size Response Ranking of 80 was achieved, with an induced Response Ranking of 104 in the <1 inch material. This result indicated that the combination of natural and induced deportment provided an additional 13% to 26% improvement on the Response Ranking, dependent on the proportion of high and low grade ore across the bench.
  • Blast 3 was conducted as a “high intensity” blast assessing natural grade by size deportment. The trial assessed the impact of finer fragmentation on metal upgrading response at production scale. An overall Grade by Size Response Ranking value of 78 was achieved which provides an upgrade of 1.87 in 20% of the mass.

The pilot trials validated, at production scale, the upgrading potential of Los Bronces ores through natural and induced deportment. The trials provided Anglo American the confidence to investigate options for moving towards full-scale operational implementation.

 

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  • 24 January 2018: CRC ORE has been involved in a number of high profile events in recent months. Read more about CRC ORE’s Annual Assembly line up and a successful site-based innovation leadership talk with Sumitomo at IMARC2017. CRC ORE also cooperated with METS Ignited to organise an initial consultation session for the consideration of a new CRC for the mining industry at IMARC. A couple of short courses were held – one on Geometallurgy in Tasmania and the respected Gold Plant Operators Course which was run in Kalgoorlie late last year.

    We are in the process of putting together the schedule for the coming year. Stay tuned for a listing of upcoming events in the next edition.

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  • 5 April 2018: CRC ORE's Grade Engineering modelling programs have been strengthened over the summer thanks to the work of four motivated students who joined CRC ORE for our inaugural vacation intern program. Alex Perera, James Bamford, and Jacob Rogers joined us from The University of Queensland (UQ). Samantha Maslin joined us from the Queensland University of Technology (QUT) with the support of Austmine via its women in STEM (Science, Technology, Engineering and Maths) initiative. Hear more about their work by clicking on the video below.

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  • 21 November 2017: The photos and presentations from this year's CRC ORE Annual Assembly have been added to our website.

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  • 30 June 2017: Two of CRC ORE’s Board Members have been recognised for excellence in their chosen fields in recent months. Dr Sue Keay has just been named one of Australia’s first Superstars of science, technology, engineering and mathematics (STEM). This follows news that Joe Pease has been recognised in two prestigious mining industry awards. Also in recent months, CRC ORE was awarded a high commendation for an “exceptional paper demonstrating excellence” in the CEEC Medal 2017 round.

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  • 30 November 2016: For presentations, photos and the wrap up of the 2016 Assembly, read on.

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  • 15 February 2016: Forward thinkers of the mining industry came together at the start of the year to celebrate the official launch of a second phase for the highly successful CRC ORE.

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  • 2 November 2015: The Directors of CRC ORE are very pleased to announce the appointment of Professor Ben Adair as Managing Director and Chief Executive Officer of Australian mining innovation hub, CRC ORE Limited.

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  • 6 October 2015: The CRC ORE team has moved to CSIRO's Queensland Centre for Advanced Technologies (QCAT) in Pullenvale, Brisbane.

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  • 26 May 2015:  CRC ORE is set to be funded for a second six year term with the Australian Government flagging $34.45 million to support vital ongoing work in improving the efficiency and cost-effectiveness of the minerals extraction industry.

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