Drilling targets within the Björkdal Mine, Skellefteå, Sweden

Abstract

This reports presents an evaluation of potential drilling targets within the Bj\u00F6rkdal Mine. The selection of these drilling targets is based on the conceptual structural geological model which re-interprets the geometry of the mineralised body to consist of 5 sheets of mineralised granodiorite juxtaposed across thrusts planes which have considerable displacement. Mineralisation is interpreted to have occurred prior to crustal compression associated with the thrusts and is related to the development to brittle-ductile shear zones associated with crustal extension. The gold is hosted in steep shear zones associated with the shear zones. The dissected geometry of the orebody implies that ore-sheets have been placed on top of one another and that mineralisation potential may exist both below the level of the present pit bottom and in extensions to ore zones in thrust sheets of known mineralisation outside of the mine. Targets are derived from areas whera a known geological structures is open at depth or along strike and also areas which are poorly drilled but have the potential of being mineralised as other parts of the same thrust sheet are mineralised. A number of targets have been identified and volumes have been derived for thesse undrilled areas from DATAMINE software. These are: East Pit Hangingwall, East Pit Bottom, East of Quartz Mountain, South of West Pit, West Pit Extension, West Pit Bottom, Central Pit Bottom, West of Nylund, and North of Nylund. These targets have been prioritised for a potential drilling program.