EX-99.1 2 ex01d01winu.htm EXHIBIT 99.1
EXHIBIT 99.1 Notice to ASX Rio Tinto Exploration Update – Winu project 1 August 2019 As previously announced1, Rio Tinto has discovered copper-gold mineralisation at the Winu project in the Yeneena Basin of the Paterson Province in Western Australia. This release provides new data on fourteen diamond drill holes and twenty-eight reverse circulation (RC) drill holes completed since the last report. Significant intercepts for the forty-two drill holes are set out in Table 1 below. Results continue to indicate relatively wide intersections of vein style copper mineralisation associated with gold and silver beneath relatively shallow cover. The mineralisation remains open at depth and to the east, north, and south, with a currently defined strike length of approximately 2.1km. Drillhole details are included in Appendix 1. Drilling is ongoing with eight diamond rigs and three RC rigs drilling at Winu and further results will be reported in the first quarter of 2020. RC and diamond drilling is continuing, with RC drilling primarily focussed on defining the extent and tenor of the supergene zone and diamond drilling continuing to test the extents of the deposit. Rio Tinto continues to conduct cultural heritage surveys through strong engagement with the Traditional Owners. Preliminary technical studies have commenced on the project including environmental baseline studies, geotechnical and metallurgical testwork. Construction of a gravel airstrip is near completion. In addition to the ongoing work at Winu, Rio Tinto is conducting exploration within the broader Paterson Province on its wholly owned licences and joint venture licences during 2019. While results continue to be encouraging, the exploration project is still at an early stage and drilling to date does not allow sufficient understanding of the mineralised body to assess the potential size or quality of the mineralisation nor to enable estimation of a Mineral Resource. The assessment and interpretation of existing data is ongoing and is being used to help guide drilling for the remainder of 2019. Figure 1 shows the location of the Winu project. Figure 2 shows a plan with the location of all drill holes included in this release along with other holes drilled to date for which assay results have not yet been received. Figure 3 provides a representative cross section. Table 1: Significant mineralised drill hole intercepts with >0.2% Cu or >0.2 g/t Au. Minimum interval length is 10 m and maximum dilution allowed is 10 m Down hole (m) Down hole Copper Gold Silver Drill hole From To length (m) (Cu %) (Au g/t) (Ag g/t) WINU0037 77.8 232.9 155.1 0.41 0.38 2.39 WINU0039 113 183 70 0.24 0.21 1.63 WINU0039 212 250 38 0.22 0.09 1.92 WINU0039 293 397 104 0.48 0.21 2.45 WINU0039 419 445 26 0.21 0.13 0.98 WINU0040 74 158 84 0.12 0.35 0.41 WINU0040 184 325.9 141.9 0.32 0.27 1.69 1 “Rio Tinto Exploration Update – copper-gold mineralisation discovered in the Paterson Province in the far east Pilbara region of Western Australia” released to ASX on 27 February 2019, and “Rio Tinto Exploration Update – Winu Project”, released to ASX on 6 June 2019. Page 1 of 13

Down hole (m) Down hole Copper Gold Silver Drill hole From To length (m) (Cu %) (Au g/t) (Ag g/t) WINU0040 344 395 51 0.21 0.16 0.90 WINU0040 407 419 12 0.23 0.19 0.93 WINU0040 436 447 11 0.41 0.38 2.10 WINU0040 514 535 21 0.14 0.60 0.76 WINU0041 269 383 114 0.25 0.19 1.08 WINU0042 93 119 26 0.22 0.14 0.42 WINU0042 154 172 18 0.23 0.15 1.51 WINU0042 192 238 46 0.28 0.29 2.19 WINU0042 292.1 444 151.9 0.52 0.23 3.13 WINU0042 462 558 96 0.44 0.20 2.26 WINU0042 570.8 690 119.2 0.29 0.12 1.62 WINU0042 707 734.3 27.3 0.24 0.17 1.10 WINU0045 77 87 10 0.04 0.25 0.22 WINU0045 107 139 32 0.05 0.61 0.16 WINU0045 154 223 69 0.05 0.40 0.18 WINU0045 243 362 119 0.08 0.29 0.29 WINU0045 400 410 10 0.06 0.26 0.33 WINU0045 433.6 460.6 27 0.18 0.22 0.70 WINU0045 527 551.5 24.5 0.23 0.19 0.75 WINU0045 577 609 32 0.11 0.21 0.40 WINU0046 282.9 353 70.1 0.26 0.20 1.28 WINU0046 378 390 12 0.16 0.22 0.71 WINU0046 430.3 466 35.7 0.25 0.10 1.05 WINU0049 99 156 57 0.20 0.21 0.99 WINU0051 183 342 159 0.20 0.16 1.06 WINU0051 361 508 147 0.25 0.12 1.33 WINU0051 520 704 184 0.50 0.23 3.11 WINU0051 715 783 68 0.46 0.19 2.60 WINU0052 95.7 110 14.3 0.33 0.14 2.34 WINU0052 182 221 39 0.17 0.20 1.06 WINU0052 239 268 29 0.21 0.13 0.76 WINU0052 283 325 42 0.20 0.13 1.13 WINU0052 341.1 358 16.9 0.25 0.08 1.07 WINU0052 384.1 427 42.9 0.22 0.11 0.79 WINU0052 460.2 481 20.8 0.21 0.24 0.92 WINU0052 513.3 625 111.7 0.29 0.18 1.28 WINU0052 643 728 85 0.34 0.13 1.06 WINU0053 70.9 246 175.1 0.19 0.25 1.41 WINU0055 324 338 14 0.21 0.10 0.85 WINU0055 354 365 11 0.38 0.09 1.47 WINU0055 408 434 26 0.33 0.18 1.10 WINU0055 450.2 479 28.8 0.19 0.22 0.73 WINU0101 76 191 115 0.24 0.26 1.37 WINU0102 80 214 134 0.24 0.20 1.82 WINU0103 62 96 34 0.11 0.21 0.72 Page 2 of 13

Down hole (m) Down hole Copper Gold Silver Drill hole From To length (m) (Cu %) (Au g/t) (Ag g/t) WINU0103 137 152 15 0.21 0.11 1.42 WINU0103 153 203 50 0.13 0.20 0.82 WINU0104 72 259 187 0.19 0.23 1.29 WINU0105 59 252 193 0.21 0.29 1.29 WINU0107 64 252 188 0.42 0.39 2.65 WINU0109 67 151 84 0.62 1.41 4.83 WINU0110 60 174 114 0.41 0.71 2.44 WINU0113 71 250 179 0.53 0.47 3.77 WINU0117 74 258 184 0.47 0.39 3.36 WINU0118 72 240 168 0.81 0.51 5.33 WINU0120 115 217 102 0.14 0.35 0.84 WINU0121 79 249 170 0.63 0.26 3.94 WINU0122 75 94 19 0.03 0.76 1.43 WINU0122 106 238 132 0.36 0.46 2.00 WINU0124 63 166 103 0.42 0.58 2.30 WINU0124 184 249 65 0.12 0.33 0.96 WINU0125 67 274 207 0.30 0.61 1.87 WINU0126 75 232 157 0.37 0.41 2.30 WINU0127 55 252 197 0.62 0.52 3.28 WINU0128 74 250 176 0.31 0.43 1.98 WINU0129 56 75 19 0.02 0.27 0.78 WINU0129 95 228 133 0.30 0.30 2.08 WINU0130 84 198 114 0.35 0.33 1.99 WINU0130 214 256 42 0.30 0.43 1.98 WINU0133 60 237 177 0.49 0.42 3.38 WINU0134 97 192 95 0.22 0.28 1.56 WINU0135 65 101 36 0.08 0.22 1.39 WINU0135 146 169 23 0.21 0.44 1.48 WINU0135 213 249 36 0.22 0.19 1.79 WINU0136 112 214 102 0.30 0.18 2.17 WINU0137 72 251 179 0.56 0.31 3.88 WINU0141 78 237 159 0.29 0.44 1.53 WINU0151 64 241 177 0.58 0.40 3.18 Drill holes that did not intersect significant mineralisation at 0.2% Cu or 0.2 g/t Au cut-off include WINU0038 and WINU0048. All drill hole depths are reported to one decimal place. Page 3 of 13

Figure 1: Location map of the Winu project Competent Persons Statement The information in this report that relates to Exploration Results is based on information compiled under the supervision of Dr Julian Verbeek who is a Member of the Australasian Institute of Mining and Metallurgy (MAusIMM) and has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity to which he is undertaking to qualify as a competent person as defined in the 2012 edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Dr Julian Verbeek is a full-time employee of Rio Tinto Exploration and consents to the inclusion in the report of the matters based on his information in the form and context in which it appears. Page 4 of 13

Figure 2: Drill collar location plan for Winu with cross section line location Abandoned drillholes are not displayed. All drill hole numbers not prefixed are WINU* series. Results as of 30 June 2019. Page 5 of 13

Figure 3: Representative cross section through Winu mineralisation Page 6 of 13

Winu Project: JORC Table 1 The following table provides a summary of important assessment and reporting criteria used at the Winu project for the reporting of Exploration Results in accordance with the Table 1 checklist in The Australasian Code for the Reporting of Exploration Results, Mineral Resources and Ore Reserves (The JORC Code, 2012 Edition). Criteria in each section apply to all preceding and succeeding sections. SECTION 1 SAMPLING TECHNIQUES AND DATA Criteria Commentary Sampling • Reverse circulation drilling samples were collected from a cone split on the cyclone on a 1-m techniques interval. The sample consisted of the 10% of the drilled metre and its weight varied from 2 to 5 kg. Heavy samples were split manually using a single tier riffle splitter to produce a manageable sample weight. PQ and HQ diamond core was drilled on a 6-m run. The core was cut using an automated core-cutter and sample was collected on a 1-m interval half core. Drilling • The drilling consisted of reverse circulation with face sampling bit and triple tubed diamond techniques drilling from surface. • The drill holes were generally cased from 30 m progressing from PQ to HQ at 160 m on average; however, exact depths vary from hole to hole. • The core was oriented using the ACT III RD tool. At the end of each run, the low side of the core was marked by the drillers and this was used at the site for marking the whole drill core with a reference line. Drill sample • Core recovery was measured and recorded continuously from the start of casing to the end of recovery the hole for every drill hole. Each run of 6 m length was marked by a core block which provided the depth, the core drilled and the core recovered. • Generally the core recovery was >99%. • RC samples were weighted, the hole was flushed after each 1m sample and the sample weights were compared to identify any loss. Generally, the sample weights were comparable. Logging • Detailed descriptions of core were logged qualitatively for lithological composition and texture, structures, veining and sulphide composition. In addition, a quantitative estimate was also done for some minerals including sulphides. • Structural and geotechnical measurements were also recorded and uploaded into acQuire. • All the drilled holes were logged before sampling. • The core was photographed both dry and wet inside the core trays. • The logging of the RC chips was done after sieving and washing of the material collected from the cyclone. Sub-sampling • Diamond core was sawn into two, and half was collected in a bag and submitted for analysis, techniques and the other half was kept in the tray and stored. The core was sampled at 1m intervals with sample breaks for major geological changes. Intervals generally range from 0.5 m to 1 m. preparation • The diamond half core and RC samples were sent to an ALS Limited laboratory, where they were dried and crushed to 2 mm with 70% pass and then split using a rotary splitter to produce a 750 g sub-sample. The crushed sub-sample was pulverised with 85% passing 75 µm using a LM2 mill and a 30 to 50 g sample taken for analysis. • A portion of the 2 mm sized material was used for VNIR/SWIR spectral readings, which were sent to AusSpec International for interpretation. • Duplicate samples were collected at each stage of the preparation, with a rate of 1:50 (field duplicates) or 1:20 (crush and pulp duplicates) samples. Duplicate results show acceptable levels of precision for the style of mineralisation. • Sample sizes are considered appropriate for the style of mineralisation. Page 7 of 13

Quality of assay • All samples were submitted to an ALS Limited laboratory in Perth. data and • 51 elements were analysed using 4-acid digestion followed by ICP-OES/MS measurements, laboratory tests including qualitative Au, Pt and Pd. • 30 to 50 g of sample were used for Au analysis by fire assay with AAS finish. • Portable XRF analysis on pulp for Cr, Nb, S, Si, Ta, Ti, Y and Zr was done using a Delta and Vanta Olympus instrument. • Quality control samples consisted of field duplicates (1:50), crush duplicates (1:20), pulp duplicates (1:20), blanks (1:20) and certified reference materials (3:100). All the results are checked in the acQuire database before being used, and the analysed batches are continuously reviewed to ensure they are performing within acceptable accuracy and precision limits for the style of mineralisation. A number of batches are being reviewed for potential undercall in Au, however there is not expected to be a material change. No material contamination was noted in the laboratory process. Verification of • All the sample intervals were visually verified using high quality core photography through sampling and Imago, and some selected samples were taken inside the mineralised interval for optical assaying microscopy by qualified petrologists. • No adjustment was done on the assay data that are electronically uploaded from the laboratory to the database. • The drill core logging data is managed by a computerised system and strict validation steps were followed. • The data are stored in a secured database with restricted access. • There are two twinned holes (one RC and one diamond) that were drilled for validation of the assays. The results from these holes indicate that there is no bias present due to drilling method. • A systematic analysis of duplicate samples was carried out at each stage of sampling including field, crush and pulp duplicates. The results from the duplicates were within acceptable range for this type of mineralisation. The results from blanks did not indicate contamination during the laboratory procedure. Location of data • Drill hole collar locations were surveyed after drilling utilising a handheld Garmin GPS with an points accuracy of 5 m, or by an independent survey contractor using a Leica Viva GS15 GNSS base and rover system operating in RTK mode to a stated accuracy of +/- 20 mm. • The topography is relatively flat with average elevation of 240 m. • The data for the collars are provided in the Geocentric Datum of Australia (GDA94 zone 51). • Downhole surveys were completed every 10, 25 or 50 m using a Reflex EZ Gyro or Reflex SPRINT-IQ. Data spacing • The diamond drill hole spacing is 130 to 150 m across strike by 150 m or 300 m along strike and distribution (between lines). The reverse circulation drill hole spacing is being performed on a 75 m by 75 m spacing and this report is the partial completion of that grid spacing. • A reverse circulation grade variability cross at 25 m spacing was installed as a part of the drilling included in this report. • The current drilling does not provide sufficient information for estimation of a Mineral Resource. • The intercepted mineralisation is still open to the east, north, south and at depth and further drilling will continue during 2019. • No compositing has been applied to the samples. Page 8 of 13

Orientation of • Drilling is mainly orientated perpendicular to the main structural trend of the area; however, data in relation there are multiple mineralisation events and there is insufficient data to confirm the to geological geological model. structure Sample security • Samples in calico bags are stored on site in enclosed stillages and transported via road on trucks from the site to an ALS Limited laboratory in Perth via Port Hedland. • The diamond sample intervals were verified against the recorded core lost in the drilling plods. • Sample numbers were generated directly from the database. • Each sample was given a barcode at the laboratory and the laboratory reconciled the received sample list with physical samples. Barcode readers were used at the different stages of the analytical process. • The laboratory uses a LIMS system that further ensures the integrity of the results. Audits or • No external audits have been performed at this early stage of the project. reviews • The database containing the data related to all Rio Tinto exploration programs is internally checked. SECTION 2 REPORTING OF EXPLORATION RESULTS Criteria Commentary Mineral • All Rio Tinto Exploration tenements are kept with respect to the legislation in terms of tenement and obligations including minimum expenditure. This project is located within Exploration Licence land tenure E45/4833, which is 100% owned by Rio Tinto and expires on the 12th of October 2022. status Exploration done • No exploration has been carried out in the Winu area prior to Rio Tinto work in 2016. by other parties Geology • The prospect is located on the Anketell Shelf of the Yeneena Basin, a Neoproterozoic sequence of metasedimentary rocks and granitoids that is entirely covered by Phanerozoic sediments, up to 100 m thick in the Winu area. • The main lithologies intercepted by the current drilling at Winu include metasedimentary rocks (quartzites, metasandstones, metasiltstones and metapelites), unmetamorphosed sedimentary cover rocks (conglomerates, arkoses and mudstones), granite and dolerite. Host rocks to copper-gold mineralisation are fine to medium-grained subarkosic metasandstones and biotite-rich metasiltstones. • The mineralisation is predominantly vein controlled. Mineralisation includes chalcopyrite, chalcocite, pyrite, pyrrhotite, molybdenite, bornite, scheelite, bismuthinite and wolframite. Several generations of veins are identified and characterised by different mineralogical assemblages and textures. The main mineralisation event is associated with quartz-K- feldspar-sulphide and sulphide-carbonate veins with dominantly K-feldspar, muscovite, biotite and/or chlorite wallrock alteration. • Primary sulphide mineralisation is overlain by a supergene blanket containing secondary copper minerals as well as native copper in places. Drill hole • Appendix 1 provides details of drill hole coordinates, orientations and length for all drill Information holes. Page 9 of 13

Data • The average grades presented in this report are all length-weighted averages above a 0.2% aggregation Cu or 0.2g/t Au cut-off. Minimum interval length is 10 m and maximum dilution allowed is methods 10 m. Relationship • Insufficient data is available to confirm the geological model and as such all results are between reported in apparent width; the true width is still unknown. mineralisation widths and intercept lengths Diagrams • Plans are included in the release as below: • Location Map (Figure 1), Drillhole collar plan (Figure 2) and Winu Cross section (Figure 3) Balanced • This is the third release of available exploration results for this deposit. Drilling is ongoing and reporting further results will be reported in a subsequent release in Quarter 1, 2020. Other • Specific gravity measurements were taken on 20 cm of solid core for every 20 m, substantive representing different lithologies and mineralised intervals. The measurement used the exploration data hydrostatic/gravimetric method (Archimedes Principle of buoyancy). • Hyperspectral and high-resolution core imagery is being collected using a CoreScan Hyperspectral Core Imager. Whole core is imaged at Winu prior to sample cutting, where possible. Historical Winu core from 2018 and 2019 is imaged as half core. • Magnetic susceptibility was measured for each sample using KT-10 (kappameter) instrument. • Geophysical surveys were carried out over the deposit area including airborne electromagnetics, ground gravity, induced polarisation/resistivity, passive seismic, and downhole density, gamma, conductivity, resistivity, induced polarisation, magnetic susceptibility and acoustic televiewer. • Geometallurgical characterisation was conducted on the first RC holes, which indicated satisfactory results however further tests are required to confirm potential recovery. • LiDAR imagery was acquired to help in better planning and reporting of the exploration program. Further work • Rio Tinto continues to evaluate and interpret the results from the 2018 and 2019 work program. • The results presented here indicate the mineralisation is not closed off by the drilling performed to date. • Preliminary metallurgical test work has commenced. • Geotechnical drilling and logging is underway. • Installing water bores and water monitoring points is underway. • Drilling at Winu is ongoing. • In addition to the ongoing work at Winu, Rio Tinto is conducting exploration within the broader Paterson Province on its wholly owned licences and joint venture licences during 2019. Page 10 of 13

Appendix 1: Drill hole coordinates, orientations and depths The data for the collars are provided in the Geocentric Datum of Australia (GDA94 zone 51) Easting Northing Elevation Down hole Dip Azimuth Drill hole Hole type Hole status (mE) (mN) (m RL) depth (m) (deg) (deg) WINU0037 369256.7 7707869.3 245.3 232.9 -60 265 Diamond Fully Assayed WINU0038 369825.7 7706728.1 253.1 325.1 -60 265 Diamond Fully Assayed WINU0039 369624.3 7707157.2 248.7 510.3 -60 265 Diamond Fully Assayed WINU0040 370022.3 7707312.9 247.1 537.5 -60 265 Diamond Fully Assayed WINU0041 369169.7 7709079.9 245.6 529.3 -60 265 Diamond Fully Assayed WINU0042 369577.7 7707610.1 246.3 786.3 -60 265 Diamond Fully Assayed WINU0044 369179.6 7708927.8 247.7 128 -60 265 Diamond Abandoned - not assayed WINU0045 370268.0 7707216.2 247.8 650.6 -60 265 Diamond Fully Assayed WINU0046 369179.0 7708930.0 250.0 499.7 -60 265 Diamond Fully Assayed WINU0047 369254.4 7707851.4 245.6 132 -90 0 Percussion Waterbore - not assayed WINU0048 368768.9 7708300.2 245.9 432.6 -60 265 Diamond Fully Assayed WINU0049 368939.0 7709058.7 246.6 337 -60 265 Diamond Fully Assayed WINU0050 369196.8 7709138.6 245.9 128 -90 0 Percussion Waterbore - not assayed WINU0051 369555.5 7707911.2 246.3 828.3 -60 265 Diamond Fully Assayed WINU0052 369186.6 7708330.4 247.1 810.5 -60 0 Diamond Fully Assayed WINU0053 368928.0 7708310.2 245.5 399.6 -60 265 Diamond Fully Assayed WINU0055 369330.5 7708944.1 247.2 504 -60 265 Diamond Fully Assayed WINU0100 368869.0 7708407.0 249.6 42 -70 265 RC Abandoned - not assayed WINU0101 368871.8 7708406.3 246.0 191 -90 0 RC Fully Assayed WINU0102 369067.2 7708421.3 248.3 216 -90 0 RC Fully Assayed WINU0103 368818.1 7708402.8 246.1 258 -90 0 RC Fully Assayed WINU0104 368919.8 7708412.6 246.5 264 -70 265 RC Fully Assayed WINU0105 368970.7 7708410.1 246.6 252 -70 265 RC Fully Assayed WINU0106 369018.2 7708413.6 247.1 66 -70 265 RC Abandoned - not assayed WINU0107 369033.0 7708414.6 247.5 252 -70 265 RC Fully Assayed WINU0108 369487.2 7707072.5 250.6 24 -90 0 RC Abandoned - not assayed WINU0109 369217.5 7707347.6 248.7 154 -90 0 RC Fully Assayed WINU0110 369038.0 7707963.9 245.3 174 -70 265 RC Fully Assayed WINU0111 369064.6 7707967.4 245.2 54 -70 265 RC Abandoned - not assayed WINU0113 369111.5 7707971.6 245.2 252 -70 265 RC Fully Assayed WINU0114 369135.4 7707972.4 245.2 120 -70 265 RC Abandoned - not assayed WINU0115 369084.3 7708021.9 244.9 160 -85 265 RC Abandoned - not assayed WINU0117 369088.7 7707942.9 245.2 258 -85 265 RC Fully Assayed WINU0118 369085.1 7707993.3 245.1 240 -85 265 RC Fully Assayed Page 11 of 13

Easting Northing Elevation Down hole Dip Azimuth Drill hole Hole type Hole status (mE) (mN) (m RL) depth (m) (deg) (deg) WINU0120 369560.6 7707077.8 250.0 252 -85 265 RC Fully Assayed WINU0121 369295.0 7707352.8 248.5 252 -85 265 RC Fully Assayed WINU0122 369371.6 7707359.9 247.9 238 -85 265 RC Fully Assayed WINU0123 369531.2 7706389.0 252.6 84 -85 265 RC Abandoned - not assayed WINU0124 369440.2 7707366.9 247.7 250 -85 265 RC Fully Assayed WINU0125 369512.4 7707374.0 247.4 274 -85 265 RC Fully Assayed WINU0126 369589.0 7707378.6 247.1 232 -85 265 RC Fully Assayed WINU0127 369210.8 7707426.1 248.3 268 -85 265 RC Fully Assayed WINU0128 369357.8 7707440.7 247.2 250 -85 265 RC Fully Assayed WINU0129 369511.4 7707453.0 246.7 250 -85 265 RC Fully Assayed WINU0130 369254.9 7707201.9 250.2 256 -85 265 RC Fully Assayed WINU0132 369054.0 7707489.0 250.0 138 -90 265 RC Abandoned - not assayed WINU0133 369204.5 7707500.8 247.7 252 -85 265 RC Fully Assayed WINU0134 369357.0 7707514.6 246.5 192 -85 265 RC Fully Assayed WINU0135 369432.8 7707520.1 246.5 250 -85 265 RC Fully Assayed WINU0136 369507.9 7707526.5 246.4 252 -85 265 RC Fully Assayed WINU0137 369161.6 7707950.9 245.3 252 -85 265 RC Fully Assayed WINU0141 368953.1 7707927.7 245.4 239 -85 265 RC Fully Assayed WINU0151 369330.1 7707206.3 249.7 250 -85 265 RC Fully Assayed Table also provides details of two waterbores and abandoned drillholes completed during the period. Page 12 of 13

Contacts media.enquiries@riotinto.com riotinto.com Follow @RioTinto on Twitter Media Relations United Kingdom Media Relations, Australia Illtud Harri Jonathan Rose T +44 20 7781 1152 T +61 3 9283 3088 M +44 7920 503 600 M +61 447 028 913 David Outhwaite Matt Chambers T +44 20 7781 1623 T +61 (0) 3 9283 3087 M +44 7787 597 493 M +61 433 525 739 Media Relations, Americas Jesse Riseborough Matthew Klar T +61 8 6211 6013 T +1 514 608 4429 M +61 436 653 412 Media Relations, Asia Grant Donald T +65 6679 9290 M +65 9722 6028 Investor Relations, United Kingdom Investor Relations, Australia John Smelt Natalie Worley T +44 20 7781 1654 T +61 3 9283 3063 M +44 7879 642 675 M +61 409 210 462 David Ovington Rachel Storrs T +44 20 7781 2051 T +61 3 9283 3628 M +44 7920 010 978 M +61 417 401 018 Rio Tinto plc Rio Tinto Limited 6 St James’s Square Level 7, 360 Collins Street London SW1Y 4AD Melbourne 3000 United Kingdom Australia T +44 20 7781 2000 T +61 3 9283 3333 Registered in England Registered in Australia No. 719885 ABN 96 004 458 404 Page 13 of 13