The Pyramid property is underlain by volcanic and meta-sedimentary rocks of the Jurassic Shonektaw Formation. These rocks have been intruded by Triassic-Jurassic intrusives including hornblende diorites, quartz diorites, and granodiorites. In the Chille zone, the intrusion hosts abundant xenoliths of Takla Group in the contact area and at least two prominent roof pendants about 1 kilometre in diameter.

The Chilli zone encompasses an area approximately 1 by 1.5 kilometres in size that is predominantly altered to outer propylitic assemblages but includes regions with magnetite, quartz-sericite-pyrite, and argillic alteration. The area was discovered due to the presence of strongly silicified and pyritic (up to 10 per cent) diorites. Mineralization is relatively low grade in the area but samples at the lowest elevation yielded the most encouraging values of up to 0.15 per cent copper, from grab sample (D00014037) taken from a gossanous zone with 15 per cent disseminated pyrite in diorite porphyry (Assessment Report 36779). Many grab samples describe traces of disseminated chalcopyrite along with the more abundant disseminated pyrite, often with quartz flooding. Some veins and stringers of quartz occur with pyrite, chalcopyrite and epidote are describe as stringers or fracture fillings of just pyrite and chalcopyrite. Host rocks are typically diorite porphyry, and some are andesites, tuffs and metasediments. Some bornite observed.

Refer to Pyramid - East zone (104I 148) for details of the Pyramid property work history including the Chili zone.