I think you may be confusing BC and another jurisdiction (Ontario?) BC held a referendum in 2005 which was on Single Transferrable Vote. 57% voted in favour,

I think you may be confusing BC and another jurisdiction (Ontario?) BC held a referendum in 2005 which was on Single Transferrable Vote. 57% voted in favour, but the threshold was set at 60%, with a majority needed in at least 60% of the electoral districts. BC held a second referendum in 2009, and the vote swung in the other direction. Only 39% voted in favour of STV.