Lee mill quarry is the full name, i think. Its in Rossendale between Bacup and stacksteads.
Its mainly setup for moutain bike trails, some nice sections. There are loads of rocks and some man made trials bits, such as concrete posts, logs, cable drums Etc.
There have been a few trials comp's up there, tyke trial .
Here is a link to a video
And another link http://adrenaline-gateway.co.uk/LeeQuarry.aspx