Turns 12 volts DC to 60 volts DC with 2mA
This is a basic boost converter.

You could have made it work unregulated with a bunch of changes like;
V1=100k~1MHz, C1=50nF, R1= 1k

But here is a simple conceptual design with a dynamic load of 6mA to see the regulation error of -1.7V or 58.3V.

A simple boost IC is simpler and both work.