|The caving group said it was continuing to map the new discoveries|
About 200m of new passage has been found in a number of caves, with the longest single discovery standing at about 100m in length.
The group said the "rare find" comes only a year after it discovered a major new cave in Applecross.
Exploration and mapping of these caves near Appin is ongoing by the team.
GSG caving co-ordinator Ross Davidson said: "These are exciting discoveries and demonstrate there is still great potential for exploration in Scotland.
"Despite Appin being recognised as one of only a small number of caving areas in the country, it seems likely that there is more to find.
"So we've been concentrating our searches in this area. As we map these new discoveries, we would hope to find even more passages to add to the growing Scottish total.
"Caving offers an increasingly rare opportunity for true exploration on this crowded island.
"The Grampian Speleological Group has been exploring caves in Scotland for over 50 years but the thrill of discovering somewhere no human has ever been, never diminishes."
More info on http://www.gsg.org.uk/