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Use of DEVICO Deep Drilling Technology at Rory’s Knoll (Aurora Project), Guyana

Guyana Goldfields Inc. Use of DEVICO Deep Drilling Technology at Rory’s Knoll (Aurora Project), Guyana. The Country - Guyana. The Country - Guyana. Only English speaking country in South America British common law, secure tenure Highly literate population of 700,000 Pro-mining government

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Use of DEVICO Deep Drilling Technology at Rory’s Knoll (Aurora Project), Guyana

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  1. Guyana Goldfields Inc. Use of DEVICO Deep Drilling Technology at Rory’s Knoll (Aurora Project), Guyana

  2. The Country - Guyana

  3. The Country - Guyana • Only English speaking country in South America • British common law, secure tenure • Highly literate population of 700,000 • Pro-mining government • Largely unexplored by modern methods • Long history of significant gold production

  4. History of Gold Exploration in the Guianas “Guiana is a Country that hath yet her Maidenhead… not opened for gold, the mines not broken with sledges…” Sir Walter Raleigh The Discovery of the Large, Rich and Beautiful Empire of Guiana, 1596 Sir Walter Raleigh

  5. The Region

  6. The Guiana Shield

  7. Aurora Property, Geology Gold Creek Caleb’s East & West Geology after Bracewell, 1949

  8. Property Locations

  9. Aurora Property The Golden Mile The Golden Mile

  10. Aurora Base Camp

  11. Golden Mile Mineralized Zones Diamond Drill Holes

  12. Rory’s Knoll Diamond Drill Holes

  13. Why DEVICO ? • Constraint of 100 m x 150 m steep (70-75 deg) NNW-plunging Tonalite dimensions • Historical left turns and consistent hole shallowing when drilling westwards due to regional foliation trend (NW) • Problems with multiple wedging operations by Orbit drilling personnel • Uncontrolled hole direction-wise

  14. North East view of drilling operations Grid (10mX10m) for a 680m target. 4 pilot holes and 36 directional cuts

  15. Rig capacity on total drilled depth RPM/WOB control Mud Pump Capacity: Flow Rate- 55 l/min Pump pressure- 60 bar Drilling mud pressure gauge & flow meter Mud pump accummulator / compensator (minimize pressure/flow rate pulsation) NQ-sized inner core barrel overshot / drill pipe sub DEVICO Requirements

  16. Long Section 10700EShowing Lithology (plus blue-colored Devico directional holes)

  17. Long Section 10700EShowing Assay Composites

  18. Long Section 10750EShowing Lithology (plus blue-colored Devico directional holes)

  19. Long Section 10750EShowing Assay Composites

  20. Long Section 10800EShowing Lithology (plus blue-colored Devico directional holes)

  21. Long Section 10800EShowing Assay Composites

  22. Horizontal Plan View (-800 mRL)

  23. Horizontal Plan View (-1000 mRL)

  24. Devico directional factors • Lithology (e.g. Ash Tuff Sediments) • Structures (e.g. fault/foliation) • Drilling parameters (e.g. hole azimuth & inclination) • Target cone of influence specs per midpoint Devico target (e.g. up/down/left/right) • DEVICO limits (e.g. high torque ~ 1000 m)

  25. Devico-Orbit operations • Rig mechanical problems (e.g. pump; etc.) • Devico tool specs (e.g. thrust bearing; inner tube; etc.) • Orbit-Devico drilling operations (e.g procedural; controlled drilling; etc.) • Spare parts logistics

  26. 3-D View of Rory’s Knoll Mineralization showing 100 m x 150 m Tonalite dimensions (looking North)

  27. 3-D View of Rory’s Knoll Mineralization showing 100 m x 150 m Tonalite dimensions (looking East)

  28. Devico-Orbit hole statistics • RKD-60 mother hole: 9 directional cuts • Wedged/Devico-directed completed holes: • RKD-60DV1/60DV2/60DV3L/60DV4R/60DV5R/ • RKD-63B/RKD-67B/RKD-72B • RKD-62 mother hole: 10 directional cuts • Wedged/Devico-directed completed holes: • RKD-62DV1L/62DV2R/RKD-64/RKD-66/RKD-69/RKD-71/RKD-73 • RKD-63B/RKD-67B/RKD-72B • Abandoned holes: • RKD-61A/61B/61C/RKD-63A/67A/72A

  29. Summary • 85 % Devico-hit on Rory’s Knoll mineralized zones on 19 medium to deep directional cuts proving mineralization is “open at depth” • Cost-savings per hole (instead of drilling holes from surface): ~ 45-50% (estimated) • Successful directional cuts are mainly dependent on drilling operations’ personnel teamwork and still improving !!! • Once good Devico techs are spotted and with proven directional performance; don’t let go of them !!!

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