"Maybe it doesn’t hang together that well and the grade isn’t good enough for a hard as hell tonalite!"
Objectively wrong, TSO's El Zorro gold district is characterised by tonnalite host rock. Tonnalite has a hardness rating of 6-7
In comparison the host rock of the historic Timbarra gold mine had granite host rock, which is similar in hardness.
IRGS deposits are characterised by low grades, bulk tonnage and high recoveries.
the hardness of tonnalite at El Zorro will not be an issue, especially with modern technology.
Ann: Tesoro increases ownership of El Zorro to 85%, page-67
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