The mineralization at Lac Knife is hosted in biotite-quartz-feldspar paragneiss and schist of the Nault Formation, in association with iron formations of the Wabush Formation. These are equivalent to the lower Proterozoic Labrador Trough rocks affected by the late Proterozoic Grenvillian orogeny. Metamorphism associated with the Grenvillian orogeny has resulted in the formation of economic grade concentrations of graphite dominated by value-enhanced large flakes.
The Lac Knife property comprises 57 map-designated claims covering 2,986.31 ha located in Esmanville Township (NTS map sheet 23B/11), 27 km south-southwest of the iron-mining town of Fermont, in the Cote-Nord administrative district of Quebec. Focus acquired a 100% interest in the property in October 2010. Maps showing the location of the Lac Knife property as well as drill holes locations are available on the company's website at www.focusgraphite.com.
2012 Infill and Deposit Margin Drill Program, Methodology and QA/QC
The summer 2012 infill and deposit margin drilling program at Lac Knife comprised 56 large diameter (PQ-sized, 4-inch) core holes for a total of 5,628 m. The drilling program was designed to map the limits of the Lac Knife graphite deposit and provide sufficient additional data and control on mineralisation to be useful for in a new resource estimate. The drilling was also designed to provide enough mineralised material for phase II metallurgical testing (see Focus' press release dated March 4th) and for subsequent pilot plant trials.
The 2012 drilling campaign was managed by IOS Services Geoscientifiques ("IOS") of Chicoutimi, Quebec. The infill and deposit margin drilling program started on July 1st and ended on September 17th 2012. The drilling was performed by G4 Drilling of Val-d'Or, Quebec under the supervision of IOS.
The 56 holes were spread over the western, central and eastern zones of the deposit (see drill holes location map available on the Company's website at www.focusgraphite.com).
Two slabs of about 1/4 of the 4 inch diameter PQ core were sawed parallel on each side of the central axis of the core. One of the slabs was earmarked for geochemical analysis while the other slab was kept as a witness sample. Center parts of the core were used as graphite-bearing material for the phase II metallurgical testing and for the subsequent pilot plant testing program.
A total of 2,076 sub-sample slabs of the PQ drill core were collected from all 56 holes and shipped to IOS for sample preparation (crushing and grinding). Once prepared, the samples were sent to the Consortium de Recherche Appliquee en Traitement et Transformation des Substances Minerales ("COREM"), an ISO/IEC 17025:2005 certified facility in Quebec-City, for graphitic carbon (Cgr) analysis using LECO high frequency combustion method with infrared measurement (internal analytical code LSA-M-B10 for graphitic carbon; ISO 9686:2004). For the measurement of graphitic carbon, the sample is pre-treated with nitric acid, placed in a LECO capsule and introduced in the furnace (1,380 degrees C) in an oxygen atmosphere. Carbon is oxidized to CO2. After the removal of moisture, gas (CO2) is measured by an infrared detector and a computerized system calculates the concentration of graphitic carbon (Cgr). Total sulphur was also analyzed by LECO (code LSA-M-B41) (Table 1). For sulphur determinations, the sample is placed in a LECO capsule and introduced in the furnace (1,380 degrees C) until sulphur is oxidized to SO2. After the removal of moisture, gas (SO2) is measured by an infrared detector and a computerized system calculates the concentration of total sulphur (%).
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