Our research has shown that Goasseac'h mound of Carhaix-Plouguer is the ruin of a Neolithic cairn, constructed almost entirely of dry stone. The exact dimensions of the monument are still to be established, with a current estimate of 90m long by 10–15m wide. It remains unclear whether the mound incorporates one or two cairns. The southern half of the mound certainly accommodates three funerary spaces, and perhaps more. The centre of the northern part of the mound has been the target of stone-robbing, destroying the passage graves but not the façades.