According to the British Colombia Ministry of Energy and Mines Mineral Deposit Classification, graphite deposits are within the metamorphic hosted group of deposits and can occur as:
• Microcrystalline Graphite (BC Deposit # P03);
• Crystalline Flake Graphite (BC Deposit # P04);
• Vein Graphite (BC Deposit # P05).
The mineralization at the Lac Knife project is consistent with the description of a crystalline flake graphite deposit. These types of deposits are described as being commonly hosted by porphyroblastic and granoblastic marbles, paragneisses and quartzites. The alumina-rich paragneisses and marbles in upper amphibolite or granulite grade metamorphic terrains are the most favourable host rocks. Minor feldspathic
intrusions, pegmatites, and iron formations also contain disseminated natural flake graphite.
The Lac Knife deposit corresponds to the higher grade type of mineralization associated with fold hinges. Simandl and Kenan stated that the grade and tonnage of producing mines and development projects can vary substantially. The median grade and size is quoted at 9.0% Cg and 2.4 million tonnes respectively meaning the resource grade and size of the Lac Knife project is above the median.
The mineralization has been categorized by Focus into 3 types: massive, semi-massive and low grade mineralization categories. All three types are intercalated within the mineralized envelope (repetition of several massive ho ........
