The site is now a Caravan park:
http://www.campkintyre.com/
Some info on the link with the Machrihanish to Campbeltown Railway here:
http://www.machrihanish.net/Machrihanish_railway.html
Remember visiting the mine when I was very young with my father, who like most of the men in the village, worked there.
The Tartan Kirk (Campbeltown Heritage Centre ) has some nice pictures and info, don't know if they have a website? Maybe Davie P or one of the other's on here can help!!
You will probably also find articles from the excellent Kintyre Mag:
http://www.kintyremag.co.uk/
Hope this helps.