We (two adults and a horde of kids) were climbing lower Silvermine on Saturday 09.04.2011 during the morning. There was a group of two guys and a woman who were there before and left before us. When we left we found the following under our heap of gear. We highly assume it belongs to you:

one 'Vertigo' Carabiner (still with instruction paper attached ...)
one solid gate carabiner
one green shortish sling
one longish prusik
two belay devices.

see picture below.

Who is the owner of that stuff? Contact me via the forum please.

... folks, check your gear before you leave the crag.