Re close to GBBDoing my weekend DD, been looking at all the maps I can find and it looks like you are right Coffin Adanac looks like it is right next to GBB or could even be in GBBs claim block.
When I use to prospect you could get Govt. Geo maps which would show the geology of the area and you could see which way the trend was going. Keep trying to find those types of maps on the in-ternet and can't find them. They would be very beneficial to look at to see which way the strike zone is trending, they have to be somewhere the Gov. spent many years making them. GLA have a good weekend, Monday looks like an exciting day for THG