It is over 10 years since I have been inside Minllyn. But if I remember correctly there is the remains of a steam powered ram in the water which would have pushed the jib upwards so as to lift.
And there must have been some kind of locking mechanism on the jib to stop it coming down after the lifting stage was completed.
It would have been a hell of a place to be when the crane was working with the fumes and the probable risk of burning from the boiler and pipes etc. Even with a piped flue (chimney) there would have been a lot of smoke in there. Very strange, but interesting to see this impement in the mine when a hand operated geared down winch would have worked fine and with less problems.
But you have to say the smell of coal and steam, just like an old Gardener powered ERF does have a wonderfull smell doesn't it???
Bellach dim ond swn y gwynt yn chwibian, lle bu gynt yr engan ar cynion yn tincian.