The Cumo showing is located in the Atna Range, approximately 7 kilometres south of Shedin Peak and 70 kilometres north of Hazelton.

The area is underlain by Middle Jurassic to Lower Cretaceous Bowser Lake Group clastic sedimentary rocks which have been intruded by a stock of granodiorite of the Late Cretaceous Bulkley Intrusions, which in turn is cut by dikes of fine-grained granite, pale aplite and pegmatite.

The mineralization, which occurs near the contact of the granodiorite, consists of pyrite, chalcopyrite and molybdenite in widely scattered quartz veinlets and veins ranging from less than a centimetre to more than 60 centimetres wide. The largest veins strike northeast and dip 15 to 20 degrees southeast. The mineralization extends over an area of approximately 100 by a few hundred metres. Alteration is not intense and grades of mineralization are low.

Work History

The showing was discovered in 1967 by Max Martin. Surface surveys and geological mapping were performed the next year by D.R. Morgan. Sampling in 1968 returned 0.09 per cent copper and 0.026 bolybdenite over 33 metres (Property File Cyprus Anvil Morgan, D., 1970).

In 2013 and 2014, Vale Exploration Canada Inc. completed a program of geological mapping, geochemical sampling and a 3278.0 line-kilometre airborne magnetic survey on the area as the S2 property. A sample (RX398005) from a mineralized granodiorite boulder, located approximately 2.2 kilometres north of the occurrence, assayed 0.229 per cent copper, 0.017 per cent molybdenum (Assessment Report 35139).

In 2017, an induced polarization and magnetotellurics survey was completed on the property.