Torch River Resources Ltd. (TSXV:TCR) announced the results of two test programs on the lump graphite from its Quebec-based Walker graphite property, commenting that higher reagent concentration, along with longer retention times in the fifth test, resulted in a best result of 99.1-percent carbon.
As quoted in the press release:
The test work was carried out at Process Research Ortech in Mississauga, Ontario and lab analysis was done at Activation Laboratories Inc. (Actlabs) in Ancaster, Ontario. The goal of the tests was to assess the potential of the Walker lump graphite to be upgraded to 95-99%C, which is considered to be commercially marketable levels. The first program consisted of a series of grinding and flotation stages, as well as a caustic leaching process. Material used in the testing was assembled during the Company’s sampling program announced in July, 2013 which outlined naturally occurring in situ grades of 89.5%C. As the table [in the press release] indicates, the upgrade process was successful in increasing this to a preliminary upgrade of 97.3%C. This is generally considered to be suitable for a wide range of product applications in the graphite sector.