use of devico deep drilling technology at rorys knoll (aurora project), guyana guyana goldfields inc
TRANSCRIPT
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Use of DEVICO Deep Drilling Technology at Rory’s Knoll (Aurora
Project), Guyana
Guyana Goldfields Inc.
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The Country - Guyana
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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
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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 RaleighThe Discovery of the Large, Rich and
Beautiful Empire of Guiana, 1596
Sir Walter Raleigh
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The Region
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The Guiana Shield
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Aurora Property, GeologyAurora Property, Geology
Geology after Bracewell, 1949
Caleb’s East & West
Gold Creek
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Property LocationsProperty Locations
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Aurora PropertyAurora Property
The Golden MileThe Golden Mile
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Aurora Base Camp
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Golden Mile Mineralized Zones Diamond Drill Holes
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Rory’s Knoll Diamond Drill Holes
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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
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North East view of drilling operationsGrid (10mX10m) for a 680m target.
4 pilot holes and 36 directional cuts
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DEVICO Requirements
• 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
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Long Section 10700E
Showing Lithology (plus blue-colored Devico directional
holes)
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Long Section 10700E
Showing Assay Composites
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Long Section 10750E
Showing Lithology (plus blue-colored Devico directional
holes)
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Long Section 10750E
Showing Assay Composites
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Long Section 10800E
Showing Lithology (plus blue-colored Devico directional
holes)
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Long Section 10800E
Showing Assay Composites
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Horizontal Plan View (-800 mRL)
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Horizontal Plan View (-1000 mRL)
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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)
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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
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3-D View of Rory’s Knoll Mineralization
showing 100 m x 150 m Tonalite
dimensions (looking North)
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3-D View of Rory’s Knoll Mineralization
showing 100 m x 150 m Tonalite dimensions
(looking East)
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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
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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 !!!