The Eureka workings are located north of Inonoaklin Creek and south of Eureka Creek.

The workings consist of 2 tunnels dating from around 1900. The lower tunnel is about 6 metres above the creek bottom and has been driven 30 metres to the north. The second tunnel is about 12 metres above this tunnel.

The area is underlain by sedimentary and volcanic rocks of the Devonian to Triassic Harper Ranch Group which have been intruded by granodiorite of the Cretaceous Whatshan batholith.

The tunnels appear to have followed a mineralized dike containing iron sulphides (pyrite) and gold values. A rough average sample yielded $1.20 in gold per ton (about 2 grams per tonne at $20.50 per ounce) and a trace of silver (Minister of Mines Annual Report 1901, page 1130-1131).