But the liberal faithful swore till they were black and blue the reason all those things were happening was because of labour's toxic tax. What happened when they abolished it? Sweet FA. Prices are still going up, and mining is still slowing down.
I do remember Abbott (and others) linking the slow down in mining directly to the carbon tax and that removing it would solve all our economic problems. You're right, no sane person would believe that the carbon tax was responsible, and as you correctly point out the decline was due to the slow down in the world economy more generally, however that isn't what was trumpeted by those who were trying to repeal it.