I found some additional info. regarding Nolan Creek quartz-Carbonate rock.
"We are fortunate to be mining in an environment where the rock bears a high percentage of quartz-carbonate. As we enter the higher quartz-carbonate enriched rocks, gold grades are rising." Garry Anselmo CEO/President of Silverado Gold Mines LTD
$$ Ka-Ching $$ Ka-Ching $$