as we await the results of the high grade drilling to see whether rudy fronk can attach a booster rocket to seabridge's tail
2012 KSM EXPLORATION TO LOOK FOR HIGH-GRADE CORE TO GOLD-COPPER SYSTEMTuesday, 3rd April 2012Toronto, Canada...Does Seabridge Gold's huge KSM gold-copper project have a large high-grade core similar to other world-class systems such as Ok Tedi, Bingham Canyon and Grasberg? Seabridge is setting out this summer to answer this question by drilling 11 deep holes on four distinct targets totaling about 7,500 meters. A growing body of evidence now suggests that such a core remains to be discovered on the KSM claims at a reasonable depth and that it was the source not only of the Kerr, Sulphurets, Mitchell and Iron Cap porphyry zones but also the neighboring Snowfields and Brucejack deposits.
Porphyry cores are formed under higher temperature and pressure conditions in deeper parts of the system. They typically contain copper-rich minerals such as bornite or chalcocite and yield copper and gold grades at multiples of KSM's reserves. World-class gold-copper porphyry districts usually exhibit links between the deeper, magmatic source ores upwards through transitional volcanic-hosted porphyries and skarn zones to replacement deposits including shallow vein systems. The six deposits in the area of KSM display this vertically evolutionary relationship. Furthermore, all four porphyry zones at KSM remain open at depth, with geological signatures that vector downwards towards higher temperature and pressure conditions.
Seabridge President and CEO Rudi Fronk said that "after we discovered the Mitchell Zone in 2006, we focused all our exploration efforts on defining reserves. At 2.2 billion tonnes of proven and probable reserves, KSM now represents one of the largest undeveloped gold-copper projects in the world. Six years of intensive exploration and data analysis strongly suggest that the six deposits in the immediate area are distinct yet related mineralizing events likely generated by a single magmatic source. The vertically-zoned mineral assemblages were then displaced laterally by regional thrust faulting. What is most encouraging to us is that the total displacement along these faults now appears to have been just a few hundred meters, not kilometers. The core should therefore be close to the existing KSM deposits at a reasonable depth. A magnetotelluric ("MT") geophysical survey conducted last year has identified several distinct resistivity targets which could represent the core.
Mr. Fronk noted that "our entire organization is optimistic about the potential success of this program but we are realistic that it may take several iterations of this program to discover the prize."
Following is a summary of the four targets that will be tested during the 2012 program (see KSM 2012 Drilling Plan).
Sulphurets Dip Projection
Thermal and chemical vectors interpreted in the Sulphurets deposit indicate that a hotter area with a favorable potassium-silicate-mineral-dominant alteration assemblage and a positive high chalcopyrite-to-pyrite ratio is present in the deeper portions of the deposit which is open down-dip. A high resistivity MT anomaly corresponds to the target area which is situated down-dip of the highest grade intervals in the Sulphurets and Main Copper deposits although they are separated by the Sulphurets Thrust Fault (see attached cross section). These observations suggest that the potential high-temperature, dense and metal-rich core zone may not have seen significant translation during thrusting and could be preserved in this location. Three drill holes totalling a minimum of 2,400 meters have been planned for this target.
Sulphurets Lateral
Historical targets have been identified 1.2 kilometers southwest and 0.5 kilometers northeast along the projection of the Sulphurets deposit. The northeast target (Ice Fields) contains drill holes with average gold and copper grades, intensive hydrothermal alteration and a high resistivity MT anomaly. Interpreted geology in this area shows that the historical drilling was too shallow to intercept the lateral projection of the Sulphurets deposit; however, the characteristics of these rocks indicate a hotter part of the mineral system well above the deposit. The southwest target (Camp Zone) was tested in 1980 with a few shallow drill holes and surface geochemistry that show abundant gold concentrations associated with a low resistivity MT anomaly. Surface cover obscures this target but the geochemistry is at levels similar to exposed deposits on the property suggesting a significant system may be concealed in the Sulphurets valley. Four drill holes totalling a minimum of 2,000 meters will test these two targets.
Kerr Dip/Strike Projection
Both the dip and strike projection of the Kerr deposit are open. On the strike projection, shallow historical drill holes indicate mineralization may extend 700 meters northeast of the defined deposit. This target is coincident with an intense low resistivity MT anomaly that increases in strength at depth. In this setting it is possible the low resistivity rocks reflect high sulphide/metal concentrations that could represent the core of the system which may have produced a gold-copper deposit with asymmetrical form. The dip projection of the Kerr deposit shows a nearly continuous and increasing intensity low resistivity zone from the deposit to depths of at least 2,000 meters down dip. The vertical continuity of the geophysical response for the Kerr deposit could indicate that much of the alteration and mineral zonation is intact under the deposit. Two drill holes totalling a minimum of 1,500 meters are planned for this target.
Mitchell/Iron Cap Lateral
In 2011, a deep drill hole was completed in Mitchell evaluating the block cave target area and exploring for a high-grade core zone. The characteristics of rocks at depth in Mitchell are similar to shallow exposures indicating that a porphyry core is unlikely along the plunge projection of the Mitchell deposit. However, the MT geophysical survey identified several low resistivity target zones that are located at the margins of Mitchell and Iron Cap. These blind targets have the electrical properties that suggest they could be the core zones (or alternatively lateral massive skarn or replacement deposits) containing high sulphide/metal concentrations. Observations of the Mitchell deposit now suggest that higher temperature alteration would be less likely to pick up the persistent foliation present in the shallow portions of the deposit, favouring the possible preservation of a core zone adjacent to the Mitchell deposit. The MT targets for this test are located in a position consistent with our interpretation of a feeder zone displacement to the exposed deposits across the Mitchell Thrust Fault. Two drill holes totalling a minimum of 1,600 meters are planned for this target
43-101 Disclosure
Exploration activities at KSM are being conducted by Seabridge personnel under the supervision of William E. Threlkeld, Senior Vice President of Seabridge and a Qualified Person as defined by National Instrument 43-101. Mr. Threlkeld has reviewed and approved this news release. An ongoing and rigorous quality control/quality assurance protocol will be employed during the 2012 program including blank and reference standards in every batch of assays. Cross-check analyses will be conducted at a second external laboratory on 10% of the samples. Samples will be assayed using fire assay atomic adsorption methods for gold and total digestion ICP methods for other elements.
Seabridge holds a 100% interest in several North American gold projects. The Company's principal assets are the KSM property located near Stewart, British Columbia, Canada and the Courageous Lake gold project located in Canada's Northwest Territories. For a breakdown of Seabridge's mineral reserves and mineral resources by category please visit the Company's website at seabridgegold.net.
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