Green Critical Minerals (ASX:GCM) has intersected up to 280m thick graphitic schist at the Emperor target in the Kimberley region of WA.

The company said one discovery hole has delineated a significant extension to the high purity deposit, and a previously untested repeat of the known mineralised package has now been discovered.

It also said the discovery has the potential to substantially expand the resource which is currently over 1km in strike, 250m in width and up to 300m thickness.

Green Critical Minerals added that further potential is also held at the interpreted extension of the Emperor fold hinge limbs open to both the east and west.