The Ace 5 showing is located on the southern peak of the Natlan Peak mountain range, 27 kilometres northeast of Hazelton.

Although details of the occurrence are not known, silver-lead- zinc mineralization is reportedly present at this location (#248 on Map 69-1). Galena-sphalerite mineralization is also reported in this area from earlier assessment work (Assessment Report 1066).

This occurrence is possibly the Jack of Hearts showing (093M 034) which is reported to occur on Twenty Mile Mountain. Although there is no Twenty Mile Mountain on modern maps, the location is thought to be east of Eighteen Mile Creek, 25 kilometres east of Hazelton.

The area is underlain by Middle Jurassic to Lower Cretaceous Bowser Lake Group greywackes and argillites intruded by granodiorite of the Late Cretaceous Bulkley Intrusions. The area is locally highly pyritic, with widespread but low-grade chalcopyrite and uncommon molybdenite.

According to the Minister of Mines Annual Report for 1909, 45 centimetres of sphalerite, seamed with thin bands of greyish white magnesian ankerite and minor galena, occur in quartz gangue which appears to follow a bedding plane in altered sedimentary rocks. The sedimentary rocks strike 030 degrees, dipping 50 degrees northwest. The footwall consists of rusty argillite and the hangingwall of hard silicified sandstone.