1918 Taikoo Aerial Ropeway

That's a good find. Agreed it looks like the view up to Quarry Gap, and the concrete channel in the foreground looks very similar to this one at the top:

I also reckon it's Taikoo Ropeway. The following link shows another of the frames that supported the cable and that it's of the same basic design as the one above.

http://hpc.vcea.net/Collection/Warren_Swire_Images?ID=20390 

One difference between the two pics is that whereas this one shows only one cable forming the cableway, the linked photo shows two. Originally the system had only a single cable, but in 1904 it was doubled (Moddesey's post of 26-8-2009 at www.gwulo.com/taikoo-aerial-ropeway) - presumably meaning the addition of the second cable seen in the linked photo. If so, the above photo should date from earlier than 1918, to sometime before 1904 -unless the second cable didn't last very long or had been removed for maintenance when the photo was taken.