update on the development of a borehole gravimeter for mining applications seigel, chouteau, giroux...
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UPDATE ON THE
DEVELOPMENT OF A BOREHOLE GRAVIMETER FOR MINING
APPLICATIONS
SEIGEL, CHOUTEAU, GIROUX & NIND
Applications of BH Gravity in Mining
Remote Detection• Massive Sulphide Deposits• Other Types of Metallic Deposits• Non-Metallic Deposits• Verification of Surface and Airborne Gravity Anomalies
Bulk Density Determinations and Applications to Mining• Deposit evaluation• Improved grade control• Relative local rock strength• Monitoring integrity of dams and tailings ponds
REMOTE DETECTIONKelly Lake: Near Miss
BULK DENSITY
PNNL Waste Treatment Plant,
Hanford, WA
ρ = g’/(4πG) = 0.01193 g’
“Gravilog”BHG for Mining
TARGET SPECIFICATIONSensitivity < 5 uGal with 1 minute reading time
Operating range 7000 mGal
Sonde diameter < 48 mm
Sonde length < 2 m
Operating depth < 2000 m (water filled hole)
Hole diameter NQ drill rods (57.2 mm)
Deviation off vertical < 60 degrees
Operating temperature 0C to +70C (downhole section)
Positioning in BH +/- 5 cm (vertical), relative, between stations
GRAVILOG Development
• Three year development & testing• Funding:
– Industry (CAMIRO)• CVRD Inco, BHPB, Areva & Schlumberger
– Canadian Government (IRAP)– Scintrex
• Work Plan– Product development at Scintrex– Modelling software at École Polytechnique
• Start: Oct 2005• Field Tests in Boreholes: mid 2008
GRAVILOG Design Layout
GRAVILOG Sensor Housing
GRAVILOG User Interface
GRAVILOG Modeling Software
GRAVILOGSystem Test Program
BENCH TESTS• Individual components tested prior to assembly• Complete prototype systemSHAKE – DOWN TESTS• Borehole near Lindsay (Sir Sanford Fleming)
– Proper functioning of all Gravilog modules & sensors– S.D of one minute measurements– Repeatability– Debugging– Efficient logging procedures
OPERATIONAL TESTS IN SPONSORS’ BOREHOLES
GRAVILOGBHG for Mining Applications
• Development nearing completion
• Modeling software complete
• Industry sponsors’ boreholes: mid 2008
• Production logging system: January 2009
CREDITS
• CAMIRO – Tom Lane
• CVRD Inco – Alan King
• BHP Billiton – Peter Diorio
• Areva – Grant Nimeck & Rod Koch
• Schlumberger – Harold Pfutzner
• IRAP – Ramesh Gupta
• Sir Sanford Fleming College