To: Wesley Barbowski who wrote (1258 ) 6/3/1998 11:01:00 AM From: Kent C. Respond to of 1829
Hi Wesley, After some discussion, Gallery decided to use Phoenix Geophysics Magnetotellurics (MT) Survey in 1997 to follow up on work done in 1996. Before Gallery used the MT, Gallery had already completed 30 km of Total Field Magnetics (TFM), Very-Low Frequency (VLF) and Horizontal Loop (HLEM). (This year we are doing 80 km of gridding) The TFM confirms and enhances the strength of the magnetic anomlay (discovered by Airborne Magnetic and Electromagnetic Surveys in June 1996). The VLF and HLEM surveys do not yield corresponding electrical responses normally produced by concentrations of sulphide minerals. Analytical Modeling of magnetic data indicates a buried source, of a relatively simple geometry approximately 200 metres in diameter, at a depth possibly below the detection limits of VLF and HLEM electrical surveys. It was because of this that Gallery decided to conduct an MT survey of a 30 km grid. Information published by Phoenix Geophysics in March 1997 states that the MT survey technique is capable of detecting conductive mineralization as deep as 2,000m or 6,500 ft. MT Survey results based on reading from 48 sites allowed Phoenix to conclude that: 1) The Okak Bay survey imaged an anomalous layer of enhanced electrical conductivity at a depth of approximately 1 km (3,300 feet) centered on survey grid coordinate 300 east and 500 north 2) the zone of enhanced conductivity appears to be approximately 400 x 400 m in size which also hosts a much weaker conductive layer at a shallower depth of approximately 400 m 3) the zone of anomalous conductivity appears to be spatially coincident with an airborne magnetic anomaly previously identified by Gallery Resources Ltd. The mineralized zone from Hole OK-M1 roughly coincides with the shallow, weak electrical conductor outlined during the MT Survey. In November 1997, a borehole UTEM-3 electrical survey of Hole OK-M1 carried out by LaMontagne Geophysics, specialists in borehole surveys, identified a good quality off-hole anomaly. Their interpretation shows this anomaly may represent a good quality conductor 100 to 200 m from the hole with a size between 100 and 200 m. The size potential is moderate for a lens shaped conductor and could be greater for other shapes. The conductor is located at approximately the same depth of the mineralization intersected in drill core. This suggest that the in-hole disseminated mineralization could represent a halo around a body of more concentrated mineralization (semi-massive eg.) capable of producing the good quality off-hole anomaly. In February 1998, Petrographic (microscope) examination of drill core reveals that the sulphide mineralization contains nickel rich (pentlandite and pyrrhotite) and copper rich (chalcopyrite) minerals which are the important sulphide minerals at Voisey's Bay. The core contains abundant biotite as does the host troctolite at Voisey's Bay.