This is near the adamantium ore on Summoner's Isle, east of Delgarath. I've been nibbling away at it and finished the travertine and steelsilk, also added some of the adamantium sheets. Still needs all the thornwood, adamantium joints and radiant materials. There are also 3 unfinished diggers there which take T1/T2 building materials. Posted here because it's not listed on istariareference,