Chirlane McCray was assigned a $850million budget for her ThriveNYC program

But records show scheme has failed to keep track of what it spent the money on

The small amount of data that was collected shows it fell far short of targets

Despite that, organizers have expanded the budget to $1billion over five years 

Bill de Blasio's wife Chirlane McCray cannot explain where $850million given to the mental health program she champions has gone, according to reports. 

In the three years it has been running, organizers at ThriveNYC have largely failed to keep records of the initiative's achievements - and data that has been collected shows it lagging well behind targets. 

Despite that, the program has been granted an even bigger budget going forward and is now on track to spend $1billion over five years.