Those sixty dollars are gone
That sixty dollars is gone
I believe that both those and that work when the amount is spelled out, but just as you've written them as PeterShor and Barrie have said with plural and singular verb agreement.
Those sixty dollars were supposed to be my ticket out of this town, and now they're sailing away on a strong southern breeze.
That sixty dollars was supposed to be my ticket out of this town, and now it's sailing away on a strong southern breeze.
Those $60 are gone
When the amount is presented as currency, I believe that is the better choice.