 In 2011 , Sarnia had an overwhelmingly white population ; only 8 @.@ 54 % were visible minorities . Of those , 63 @.@ 77 % were aboriginal representing the largest group . In 2011 , 89 @.@ 31 % of Sarnians called English their mother tongue , 2 @.@ 46 % listed French , 0 @.@ 87 % stated both of those languages , and 7 @.@ 37 % said another language was their mother tongue . 
