The Company's expectations for the program, given the nature of VMS type systems, is to encounter variable but increasing mineralization as drilling steps out northwest from Torbrit. Currently, the Company's team projects the plunge direction of the DVT horizon, and the contained Torbrit deposit, to continue from the 300m elevation above sea level at Torbrit, to 300m below sea level and under the gold-silver mineralized Red Point zone. This projection is consistent with the geology and geophysics within the integrated 3D geologic model.
First Stage of Drill Program
The first stage of Dolly Varden's 2013 diamond drill program will involve drill sections, spaced on 100 meter centers, to test a 500 meter down plunge by 100 meter wide section of the DVT horizon. This unit hosts the historical Torbrit, North Star and Dolly Varden deposits which have been now identified as being part of a larger VMS system. Part of the drill program will target a very thick and productive extension of the Torbrit deposit that historic Torbrit mine records show is a very impressive central portion of the Torbrit deposit where an approximately 60 meter thick section was mined at an average silver grade of 17 oz/ton (530 g/t).
Recently, 3D modeling incorporating all the previously acquired data show a moderate to shallow NNW plunge to the thickest and highest silver grades. The same assembled data show an un-mined silver-rich "cap" (hanging wall) to the mined-out core of the Torbrit deposit.
Evidence that the Torbrit deposit is developed over a width of 100 meters is taken from information from historic stopes; from historic drill holes that returned up to a 158 foot interval (at 12.6 oz/ton silver), adjacent to a stoped out area; and from 2012 underground sampling that returned 7 to 8 oz/ton silver over widths of 56 to 77 meters (DV news release, February 8, 2013). Evidence from the mined out portions of Torbrit shows that the deposit ranged from 10 meters to 60 meters thick.
The Company has used an integrated geologic model which will be updated with the results from this year's drilling results, combined with all prior data to model the controls on the geology, the mineralization, and geometry of this thick section of the deposit.
The DVT Horizon Explained
The Company has now conducted two generations of helicopter-borne geophysical surveys: in 2010, an AeroTEM II, magnetic and radiometric survey; and in 2012, a new ZTEM and Magnetic survey. Importantly, provisional 2D inversion of the Geotech ZTEM Resistivity data has mapped the response of the footwall strata of the Torbrit silver deposits and also given a reliable and consistent interpretation of the important Salmon River formation strata, which is the host stratigraphy of the Eskay Creek deposit. The Company's assembled 3D data and the newly obtained 2D Resistivity modeling has been integrated into a powerful new 3D model of the exploration targets on the Property.
The DVT horizon is an extensive unit that has been mapped for a strike length of 1,500 meters, and has been previously encountered by diamond drilling for a distance of 600 meters down dip/plunge. The DVT horizon is a complex unit comprised of laminated chemical sediments, explosive breccia, sulphide debris, and replacement silver, lead, zinc mineralization. The DVT is also the unifying horizon that connects the three silver deposits, Dolly Varden, North Star, and Torbrit, located at the southeastern edge of the DVT horizon, with an interpreted VMS type feeder - alteration system further north at Red Point.
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