1. GREENHILLS PORTUGAL LDA
The Application of New Mineral Processing Technologies for the Improved Recovery of Refractory Gold in Portugal
PETER SULLIVAN
OPERATIONS DIRECTOR
PDAC CONVENTION 2011
TORONTO, 7th March 2011

2. Company Relationships
MAELGWYN MINERAL SERVICES UK
GREENHILLS TECHNOLOGIES INTERNATIONAL
MAELGWYN MINERAL
SERVICES AUSTRALIA
MAELGWYN MINERAL
SERVICES AFRICA
:AGENTS IN GERMANY, PORTUGAL CHILE, RUSSIA,
MAELGWYN MINERAL
SERVICES AUSTRALIA
GREENHILLS PORTUGAL LTD

3. Greenhills Portugal Limited Greenhills Portugal LTD
Greenhills Portugal is strategically involved in the Gralheira concession licence application
To install and operate the advanced proprietary gold extraction and cyanide destruction technologies of associated company Maelgwyn Mineral Services Ltd (MMS).
Greenhills Portugal LTD

4. Greenhills Portugal LTD
The LeachoxTM Process is the integration of “in house knowledge” plus a range of established and innovative unit process steps
HPGR investigations
Imhoflot flotation
Ultra-fine grinding of the
flotation concentrate
Partial oxidation of sulphides
Leaching in a leach column to replace conventional open to atmosphere leach tanks.
Low cost cyanide destruction process
Safe handling of concentrate tails
Greenhills Portugal LTD

5. Greenhills Portugal LTD
Ore Milling
Investigating the potential of
High Pressure Grinding Rolls
for ore preparation
Initial findings indicate greatly reduced Energy Requirements (up to 60% reduction)
Greenhills Portugal LTD

6. Aachen ReactorTM

7. FLOTATION ImhoflotTM G-Cell
Aachen reactor
Aerated slurry
Distributor
Distributor
Concentrate
Tailings

8. Greenhills Portugal LTD
MMS IMHOFLOTTM FLOTATION
Shorter residence times than conventional flotation
Requires a smaller “footprint” in plant design
Reduces capex and opex significantly
No moving parts
Lower energy requirement as there is no rotor/stator required to keep the pulp in suspension
Greenhills Portugal LTD

9. ImhoflotTM G-cell –Cleaning a gold pyrite/arsenopyrite ore

10. Greenhills Portugal LTD
LeachoxTM
Intensive oxygenation to oxidize cyanide consuming species: reduces cyanide consumption and enhances leach kinetics
Leach columns can result in significant reductions in residence times for refractory gold ores
Greenhills Portugal LTD

11. LeachoxTM Process: Columns and Aachen reactorsTM

12. Aachen ReactorsTM

13. Greenhills Portugal LTD
Cyanide Destruction
Economically reduce WAD cyanide levels to comply with the most rigorous emission limits
Greenhills Portugal LTD

14. Greenhills Portugal LTD
Concentrate Tails Handling
ContubesTM safely store and dewater concentrate tails, creating a dry product for reuse or safe disposal
Arsenic left in a stable form
Greenhills Portugal LTD

15. ContubesTM
Storage of Conc. Tails
Safe Storage of Concentrate Tails

17. Background of the Gralheira-Jales deposits
The Jales mine produced 830,000 ounces of gold and almost 3,000,000 ounces of silver during its 50 year life, mostly from high grade shoots. Gold grades averaged about 12.9 g/t Au. The mine was developed only to depth of 600 meters. At the time of closing there were several blocks of mineralisation developed and ready for mining.
The Company believes the Gralheira deposit also contains equivalent or similar conditions.
Greenhills Portugal Ltd

18. Highlights of the Jales - Gralheira Property
Concession includes the past producing Jales Mine covering 5.2 km²
Environmental base line studies complete.
NI Resource Calculation shows all category resource at 3.0 g/t cut off in excess of 240,000 ounces gold (900,000 oz silver) to a depth of 300m.
Government support, positive local interest.
Competent mining conditions
Geophysics shows the “structure” reaches 1,200 meters in depth.
Deepest drill hole 520 meters below surface intersects the vein structure.
Greenhills Portugal Ltd

19. Greenhills Portugal LTD
Highlights of the
Jales - Gralheira Property
Metallurgical studies indicate 90% gold dore recovery possible for the refractory ore utilising advanced state processing (gravity, pneumatic flotation, LeachoxTM, CN-DTM).
Arsenic component left in stable form and separated from main tailings. Possibility to be placed in backfill in the stopes.
Greenhills Portugal LTD

20. PLANS FOR 2011 Gralheira - Jales
Expand the dimensions of the identified “high grade shoots” to depth and western extension.
Full Mining Licence Application in first quarter 2011.
Confirm metallurgical and environmental testwork in progress to confirm design critiera of Leachox™ process and MMS CN-D™ cyanide destruction process (April 2011).
Feasibility study including detailed engineering to be complete by May 2011.
Decision for mine development expected end
Greenhills TECHNOLOGIES INTERNATIONAL LTD

21. GREENHILLS PORTUGAL LDA Psullivan @gtiprocess.com
PETER SULLIVAN
OPERATIONS DIRECTOR
PDAC CONVENTION 2011
TORONTO, 7th March 2011