The DDH 87-5 Zone showing is located west of Sicintine River, approximately 4 kilometres south of its confluence with Tommy Jack Creek.

The area is situated near the eastern edge of the Bowser Basin, and is primarily underlain by fine- to medium-grained sediments and volcaniclastics of the Bowser Lake Group. Quartz diorite and fine-grained felsic dikes cut the sediments. The dikes typically intrude in swarms along fault zones, and are commonly pervasively altered to sericite or carbonate. Quartz and quartz-carbonate veins occur both in the sediments and in dikes and appear to be at least spatially associated with dikes or dike contacts, and with faults. Individual veins range up to 2.4 metres in width, but are typically less than 1 metre wide. They can occur as closely spaced sheeted vein systems or as stockwork zones, comprising up to 10 per cent of the rock.

Generally, sulphide content is typically less than 15 per cent, although massive sulphide veins are known. Sulphides consist of pyrite, galena, arsenopyrite, sphalerite, pyrrhotite, chalcopyrite and trace amounts of tetrahedrite and pyrargyrite. Gangue mineralogy is quartz or a mixture of quartz, calcite, dolomite and ankerite.

Locally, narrow flat lying quartz-carbonate veinlets mineralized with pyrite, arsenopyrite and galena outcrop. Drilling has intersected several zones of weak, quartz-carbonate vein stockwork containing low-grade gold and silver values. However, several were found to contain narrow, higher-grade veins within them. The highest precious metal values appeared to come from quartz-galena-sphalerite-pyrite veins located either within “felsic” (dacite) dikes or in sediment up to 3 metres from their contacts.

In 1987, a drill hole (87-5) yielded 4.3 grams per tonne gold and 83.6 grams per tonne silver over 6.6 metres (Pinsent, R.H. (2010-02-10): Geology and Mineral Potential of the TJ Ridge (Tommy Jack Creek) Property).

In 2007, sampling returned up to 12.2 grams per tonne gold and 40 grams per tonne silver (Assessment Report 29087).

Work History

During 1984 through 1989, Noranda completed programs of geophysical, geological and geochemical surveys and 35 diamond drill holes over the area and the nearby Tommy Jack (094D 036) occurrence.

In 2002, Gold City Industries optioned the Gosico property and completed a program of prospecting, geological mapping, hand trenching and rock sampling.

During 2005 through 2009, Rox Gold Inc. completed programs of geochemical sampling, diamond drilling, mapping and prospecting on the area as the TJ Ridge property.