03:00 Fri 03 Jul 2020
Rio Tinto - OT mine design and update to Reserves & Resources
Oyu Tolgoi mine design confirms project schedule and cost ranges and update to Ore Reserves and Mineral Resources
These ranges include a delay of 21 to 29 months for first sustainable production compared to the original feasibility study guidance in 2016 and an increase of
The updated mine design is the result of the review announced by
As a consequence of leaving the pillars in place, the material contained in the pillars has been reclassified from Ore Reserves to Mineral Resources. It is expected that part of the material contained in these pillars will be recoverable at a later stage following additional studies which are currently underway.
Ore handling infrastructure will be relocated to the pillars, located immediately north and south of the current Panel 0 boundaries. Panels 1 and 2 will now be initiated as independent panels or mine blocks.
Optimisation of mine designs for Panels 1 and 2 is ongoing and it is anticipated that this next phase of study may result in further movements in classifications of Ore Reserves and Mineral Resources. Any such movements will be reported following completion of the studies.
On
Ore Reserves are presented in this release on a 100 per cent ownership basis.
Table A: Changes to the Hugo Dummett North and
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| Probable Ore Reserves | Average Mill Recovery | Recoverable Metal | |||||||
| Tonnes | Cu | Au | Ag | Cu | Au | Ag | Cu | Au | Ag |
Reserves at end 2019 | 447 | 1.64 | 0.34 | 3.35 | 93 | 79 | 81 | 6.81 | 3.84 | 39.02 |
Material removed | -47 | 2.75 | 0.68 | 5.36 | 94 | 82 | 86 | -1.22 | -0.85 | -7.01 |
Reserves at | 400 | 1.51 | 0.29 | 3.11 | 93 | 79 | 80 | 5.60 | 2.99 | 32.00 |
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| Probable Ore Reserves | Average Mill Recovery | Recoverable Metal | |||||||
| Tonnes | Cu | Au | Ag | Cu | Au | Ag | Cu | Au | Ag |
Reserves at end 2019 | 32 | 1.64 | 0.57 | 3.84 | 93 | 81 | 83 | 0.49 | 0.47 | 3.28 |
Material added | 7.7 | 1.10 | 0.38 | 2.75 | 92 | 80 | 81 | 0.08 | 0.07 | 0.55 |
Reserves at | 40 | 1.54 | 0.53 | 3.63 | 92 | 81 | 83 | 0.57 | 0.55 | 3.84 |
Table B: Changes to the Hugo Dummett North and
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| Measured Mineral Resources | Indicated Mineral Resources | Inferred Mineral Resources | Total Mineral Resources | ||||||||||||
| Tonnes | Cu | Au | Ag | Tonnes | Cu | Au | Ag | Tonnes | Cu | Au | Ag | Tonnes | Cu | Au | Ag |
Resources at end 2019 | 41 | 1.58 | 0.42 | 3.74 | 349 | 1.18 | 0.31 | 2.92 | 765 | 0.80 | 0.28 | 2.40 | 1155 | 0.94 | 0.29 | 2.61 |
Material added | 17 | 2.54 | 0.64 | 5.34 | 52 | 2.39 | 0.54 | 4.63 |
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| 69 | 2.43 | 0.57 | 4.81 |
Resources at | 58 | 1.86 | 0.48 | 4.21 | 401 | 1.34 | 0.34 | 3.14 | 765 | 0.80 | 0.28 | 2.40 | 1224 | 1.03 | 0.31 | 2.73 |
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| Measured Mineral Resources | Indicated Mineral Resources | Inferred Mineral Resources | Total Mineral Resources | ||||||||||||
| Tonnes | Cu | Au | Ag | Tonnes | Cu | Au | Ag | Tonnes | Cu | Au | Ag | Tonnes | Cu | Au | Ag |
Resources at end 2019 |
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| 87 | 1.59 | 0.54 | 4.11 | 167 | 1.02 | 0.36 | 2.78 | 254 | 1.21 | 0.42 | 3.24 |
No change |
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Resources at |
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| 87 | 1.59 | 0.54 | 4.11 | 167 | 1.02 | 0.36 | 2.78 | 254 | 1.21 | 0.42 | 3.24 |
A copy of the full announcement to the ASX is available on
Competent Persons Statement
The information in this release that relates to Ore Reserves is based on information compiled by
The information in this release that relates to Mineral Resources is based on information compiled by Oyunjargal Dendev, a Competent Person who is a Member of
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