Horizonte Minerals plc / Index: AIM / Epic: HZM / Sector: Mining 12 September 2011 Horizonte Minerals plc (‘Horizonte’ or ‘the Company’) Further High Grade Nickel Drill Results from the Araguaia Nickel Project, Brazil Horizonte, the AIM and TSX quoted exploration and development company focused in Brazil, is pleased to announce continuing positive results from the infill resource drilling programme at its 100% owned Araguaia nickel project (‘Araguaia’) in Para Sate, north central Brazil. Highlights · 2.74% nickel (‘Ni’) over 9.1 metres grading from infill drilling at the Pequizeiro target · High grade intersections on the Baião target include: o 15.1 metres grading 1.82% Ni o 19.7 metres grading 1.63% Ni and o 19.9 metres grading 1.56% Ni · 529 drill holes totalling 13,084 metres completed to date as part of the infill resource drilling programme · A National Instrument 43-101 Mineral Resource of 76.6Mt at 1.35% nickel – target to upgrade resource in Q4 2011 Horizonte CEO Jeremy Martin said, “These latest drill results covering the Baião and Pequizeiro targets continue to demonstrate the consistent high nickel grades and excellent lateral continuity of mineralisation delineated at Araguaia to date.

The continued expansion of these high grade zones will be important for the overall project economics.

The multi rigdrilling programme is running to schedule and we are on target to announce a resource upgrade in Q4 2011 at Araguaia.

Wardell Armstrong International is also due on site this month to commence work on the Preliminary Economic Assessment and the Environmental Baseline study, and I look forward to updating shareholders on project developments as we continue to fast-track this exciting nickel project towards the Feasibility stage.” Further Details The results in this news release have been collated from the on-going resource drilling programme that commenced in October 2010.

The results from the most recent batch of drill holes, totalling 122 (2795.97 metres), are reported as detailed in Table 1. Table 1: Drill results reported TARGET DRILL SPACING NO.

OF HOLES METRES REPORT TABLE Pequizeiro 25m x 25m 10 340.78 Table 2 Pequizeiro 100m x 100m 5 128.18 Table 3 Baião 141m x 141m 74 1567.90 Table 4 Vila Oito East 141m x 141m 13 425.92 Table 5 Raimundo Infill various 20 333.19 Table 6
The data from the 25 metre x 25 metre drilling will be used to measure short-range variability in the mineralisation for the construction of semi-variograms for future resource estimation. The results include a high grade intersection of 9.1 metres grading 2.74% nickel (Hole PCA-DD-0635V) from the Pequizeiro target.

Several notable wide grade intersections are reported from the Baião target including 15.1 metres grading 1.82% nickel (Hole PCA-DD-0710), 19.7 metres grading 1.63% nickel (PCA-DD-0724) and 19.9 metres grading 1.56% nickel (PCA-DD-0733). On the Baião target 141 metres x 141 metres and 100 metres x 100 metres infill drilling has been completed totalling 215 holes (4,671 metres).

In addition a 100 metres x 100 metres block of 25 metres spaced holes has been completed totalling 25 holes (736 metres) on this target to measure short-range variability. On the Vila Oito East target 141 metres x 141 metres infill drilling is in progress with a total of 40 holes (1,236 metres) completed to date. On the Lontra targets drilling is in progress with 37 holes (609 metres) completed on Raimundo and 41 holes (809 metres) on the Northern target. Table 2.Pequizeiro Drilling Programme 25m x 25m spaced drilling in 100m x 100m block Intercepts ≥1% Ni cut-off (Holes PCA-DD-0635V; PCA-DD-0642V to PCA-DD-0644V; PCA-DD-0652V; PCA-DD-0655V; PCA-DD-0658V to PCA-DD-0661V) Hole From (m) To (m) Width (m) Ni % Co %
PCA-DD-0635V 8.18 17.26 9.08 2.74 0.07 PCA-DD-0642V 9.77 19.43 9.66 2.08 0.05 PCA-DD-0643V 7.67 14.81 7.14 1.42 0.11 & 20.59 22.85 2.26 1.15 0.03 PCA-DD-0644V 10.87 22.63 11.76 1.72 0.05 PCA-DD-0652V 9.00 18.50 9.50 1.46 0.05 PCA-DD-0655V 8.05 20.83 12.78 1.35 0.05 PCA-DD-0658V 7.57 20.01 12.44 1.84 0.04 PCA-DD-0659V 8.26 18.51 10.25 1.56 0.07 & 22.40 27.63 5.23 1.22 0.02 PCA-DD-0660V 7.43 22.11 14.68 1.42 0.04 PCA-DD-0661V 7.10 27.41 20.31 1.42 0.06
Table 3.Pequizeiro Drilling Programme Intercepts ≥1% Ni cut-off (Holes PCA-DD-0651; PCA-DD-0656; PCA-DD-0662 to PCA-DD-0664) Hole From (m) To (m) Width (m) Ni % Co %
PCA-DD-0651 NSI PCA-DD-0656 NSI PCA-DD-0662 4.57 7.71 3.14 1.20 0.12 PCA-DD-0663 7.06 13.32 6.26 1.26 0.04 PCA-DD-0664 1.79 15.92 14.13 1.34 0.06
Table 4.Baião Drilling Programme Intercepts ≥1% Ni cut-off (Holes PCA-DD-0665 to PCA-DD-0738) Hole From (m) To (m) Width (m) Ni % Co %
PCA-DD-0665 NSI PCA-DD-0666 6.81 12.81 6.00 1.28 0.03 PCA-DD-0667 NSI PCA-DD-0668 3.59 9.44 5.85 1.17 0.10 PCA-DD-0669 3.90 7.00 3.10 1.19 0.13 PCA-DD-0670 4.19 6.99 2.80 1.39 0.14 PCA-DD-0671 3.54 8.31 4.77 1.34 0.09 PCA-DD-0672 NSI PCA-DD-0673 3.92 6.92 3.00 1.43 0.10 PCA-DD-0674 NSI PCA-DD-0675 NSI PCA-DD-0676 NSI PCA-DD-0677 NSI PCA-DD-0678 5.94 8.88 2.94 1.24 0.15 PCA-DD-0679 6.85 12.92 6.07 1.37 0.06 PCA-DD-0680 2.33 14.79 12.46 1.28 0.05 PCA-DD-0681 3.84 6.84 3.00 1.16 0.08 PCA-DD-0682 3.94 14.06 10.12 1.49 0.06 PCA-DD-0683 0.81 10.67 9.86 1.14 0.06 PCA-DD-0684 3.36 11.98 8.62 1.50 0.05 PCA-DD-0685 NSI PCA-DD-0686 NSI PCA-DD-0687 NSI PCA-DD-0688 NSI PCA-DD-0689 NSI PCA-DD-0690 NSI PCA-DD-0691 NSI PCA-DD-0692 NSI PCA-DD-0693 NSI PCA-DD-0694 NSI PCA-DD-0695 NSI PCA-DD-0696 NSI PCA-DD-0697 NSI PCA-DD-0698 NSI PCA-DD-0699 NSI PCA-DD-0700 NSI PCA-DD-0701 4.64 9.81 5.17 1.29 0.09 PCA-DD-0702 2.98 11.66 8.68 1.25 0.06 PCA-DD-0703 3.01 6.84 3.83 1.35 0.10 PCA-DD-0704 5.42 9.20 3.78 1.29 0.15 PCA-DD-0705 2.90 9.80 6.90 1.23 0.06 PCA-DD-0706 NSI PCA-DD-0707 3.85 7.46 3.61 1.34 0.07 PCA-DD-0708 NSI PCA-DD-0709 NSI PCA-DD-0710 2.80 17.94 15.14 1.82 0.07 PCA-DD-0711 NSI PCA-DD-0712 13.39 16.34 2.95 1.17 0.02 PCA-DD-0713 6.50 21.52 15.02 1.42 0.06 PCA-DD-0714 NSI PCA-DD-0715 5.76 17.32 11.56 1.63 0.05 PCA-DD-0716 6.95 29.90 22.95 1.47 0.03 PCA-DD-0717 6.83 15.83 9.00 1.41 0.10 PCA-DD-0718 4.30 8.02 3.72 1.46 0.05 PCA-DD-0719 7.79 19.46 11.67 1.47 0.09 PCA-DD-0720 11.23 15.85 4.62 1.54 0.04 PCA-DD-0721 NSI PCA-DD-0722 8.74 13.10 4.36 1.21 0.06 PCA-DD-0723 7.28 12.82 5.54 1.72 0.08 PCA-DD-0724 8.14 27.84 19.70 1.63 0.06 PCA-DD-0725 9.83 22.48 12.65 1.49 0.03 PCA-DD-0726 5.19 9.39 4.20 2.15 0.07 PCA-DD-0727 9.82 15.32 5.50 1.52 0.06 PCA-DD-0728 NSI PCA-DD-0729 4.82 17.12 12.30 1.28 0.04 PCA-DD-0730 8.31 16.31 8.00 1.64 0.06 PCA-DD-0731 10.70 12.81 2.11 1.48 0.08 & 15.05 17.85 2.80 1.26 0.03 PCA-DD-0732 7.61 13.66 6.05 1.90 0.07 PCA-DD-0733 8.55 28.48 19.93 1.56 0.05 PCA-DD-0734 NSI PCA-DD-0735 NSI PCA-DD-0736 NSI PCA-DD-0737 13.06 19.34 6.28 1.15 0.09 PCA-DD-0738 18.13 21.79 3.66 1.34 0.02 Table 5.Vila Oito East Drilling Programme Intercepts ≥1% Ni cut-off (Holes PCA-DD-0845 to PCA-DD-0857) Hole From (m) To (m) Width (m) Ni % Co %
PCA-DD-0845 NSI PCA-DD-0846 14.44 26.66 12.22 1.46 0.05 PCA-DD-0847 NSI PCA-DD-0848 9.74 22.75 13.01 1.32 0.10 PCA-DD-0849 14.71 25.49 10.78 1.42 0.04 PCA-DD-0850 NSI PCA-DD-0851 12.24 18.03 5.79 1.54 0.11 & 21.99 30.09 8.10 1.39 0.05 PCA-DD-0852 NSI PCA-DD-0853 NSI PCA-DD-0854 NSI PCA-DD-0855 NSI PCA-DD-0856 6.76 15.47 8.71 1.46 0.06 PCA-DD-0857 NSI
Table 6.Raimundo Drilling Programme Intercepts ≥1% Ni cut-off (Holes PCA-DD-0951 to PCA-DD-0970) Hole From (m) To (m) Width (m) Ni % Co %
PCA-DD-0951 5.95 9.93 3.98 1.14 0.05 PCA-DD-0952 NSI PCA-DD-0953 NSI PCA-DD-0954 11.22 15.17 3.95 1.27 0.06 PCA-DD-0955 NSI PCA-DD-0956 NSI PCA-DD-0957 NSI PCA-DD-0958 NSI PCA-DD-0959 NSI PCA-DD-0960 19.19 26.06 6.87 1.23 0.07 PCA-DD-0961 NSI PCA-DD-0962 5.20 15.45 10.25 1.40 0.04 PCA-DD-0963 NSI PCA-DD-0964 NSI PCA-DD-0965 NSI PCA-DD-0966 NSI PCA-DD-0967 NSI PCA-DD-0968 NSI PCA-DD-0969 NSI PCA-DD-0970 NSI
NSI: No significant intersection The compositing of the nickel grades in the individual holes was completed across geological boundaries using a nickel cut-off of 1% with a minimum intercept length of 2.0 metres and a maximum length of internal waste of 2 metres.

Weighted averages were calculated using double weighting i.e.

individual samples were weighted against both length and bulk density.

As the nickel laterite deposits are essentially flat-lying, all widths given are true widths. Sample preparation and analyses Samples from the drill cores were crushed and pulverised at the SGS laboratory in Goiania and the resultant pulps analysed at SGS laboratory in Belo Horizonte using tetraborate fusion X-Ray Fluorescence (‘XRF’).

Full QA/QC procedures were implemented, including the insertion of standards, duplicates and blanks.

Check samples representing approximately 5% of all the samples will be sent to another international laboratory for analysis by XRF. Horizonte Minerals prepared this news release and Dr.

Marc-Antoine Audet P.Geo., a Qualified Person under National Instrument 43-101, reviewed and approved the technical information. * * ENDS * * For further information visit www.horizonteminerals.com or contact: Jeremy Martin Horizonte Minerals plc Tel: +44 (0) 20 7763 7157 David Hall Horizonte Minerals plc Tel: +44 (0) 20 7763 7157 Dominic Morley Panmure Gordon (UK) Limited (Nomad and Broker) Tel: +44 (0) 20 7459 3600 Joanna Weaving finnCap Ltd (Joint Broker) Tel: +44 (0) 20 7600 1658 Felicity Edwards St Brides Media & Finance Ltd (PR) Tel: +44 (0) 20 7236 1177
Notes Horizonte Minerals Plc is an AIM quoted exploration and development company with a portfolio of nickel and gold projects in the Carajas District of Brazil.

The Company is focused on creating value by generating and rapidly advancing exploration projects in tandem with joint ventures with major mining companies, providing mid-term cash flow which is then used to develop the business and pipeline projects. Horizonte has two committed major mining partners: Teck Resources Limited, a major strategic shareholder in the Company, and AngloGold Ashanti Limited, a JV partner on the gold portfolio. Horizonte owns 100 per cent of the advanced Araguaia nickel project located to the south of the Carajas mineral district of northern Brazil; the project has the potential to deliver a resource with size and grades comparable to other world-class projects in northern Brazil In addition Horizonte acquired the Lara Exploration Vila Oito project which has a non compliant potential resource of 10 to 11 Mt grading 1.3 to 1.4% Ni further consolidating the greater Araguaia district. Horizonte is well funded to accelerate the development of its core projects.
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