Head grades vary from 1.5% TGC up to 25% TGC or higher and also...

Head grades vary from 1.5% TGC up to 25% TGC or higher and also each signature will have cut of head grades in assessing the economical breakeven for production or not. The main factor is mining costs and the higher the grade the lower the mining costs all else being equal, yet there are varying degrees of metallurgical and chemical marker values that also define the quality of fa lake concentrate from any given signature. I have not seen the full metallurgical or chemical analysis report, so I cannot comment on any quality issues. Examples of some issues include high levels of SiO2, Fe2O3, Al2O3 or CaO; all of which can be problematic the higher the percentage of each oxide as a percentage of ash.

From reviewing public documents, it appears the McIntosh Signature is good quality, but will need further assessment by end users in a wide range of applications as well as any post processing for further end user evaluations.