The Black Fox mineralization is an Archean age, lode gold deposit located within the Abitibi greenstone belt. The characteristics of this deposit type include; greenstone host rocks, and gold-bearing quartz-carbonate veins. The veins occur as two main types. The first are arrays and stockworks along faults and shear-zones with a quartz-carbonate laminated fault-fill. The second are widely distributed extensional veins within carbonatized metamorphosed greenstone rocks. These deposits are typically associated with crustal scale compressional faults with a vertical extent of less than 2 kilometres and limited metallic zoning (Dubé and Geosselin, 2007).
The Black Fox deposit lies along the Destor Porcupine Fault Zone (“DPFZ”), a major, east-west trending, deep-seated, crustal fault zone. The DPFZ and its numerous splays are associated with many past and current producing gold mines and gold deposits in the Porcupine Camp. The Stock and Aquarius gold deposits are located immediately west of Black Fox and the Holloway and Holt-McDermott Mines are located immediately to the east. Each of these deposits hosts approximately 800,000 to 1 million ounces of gold. The Black Fox deposit is situated midway between two major mines: Dome-Hoyle Pond and Holt-Holloway. The Dome-Hoyle Pond deposits, located within the same structural regime 65 km west, have shown that gold bearing structures can be traced to 1,600 metres below surface where they remain open at depth. The Holt- Holloway mine, located approximately 45 kilometres to the east, has been developed down to 1,200 metres below surface.
There are several different styles of mineralization in the deposits associated with the DPFZ. Gold mineralization is structurally controlled, in a variety of geological settings. Alteration types include pyritic ankerite-sericite ± silica-albite altered mafic volcanics, green carbonate fuchsitic altered ultramafic volcanics with quartz stockworks, pyritic, porphyritic to syenitic felsic intrusives and multiple stages of quartz veins with free gold. Much of this variation is found at the Black Fox mine.