The Topo occurrence is located approximately 4 kilometres northwest of Mount Patcha. The regional geology is similar to the Spring occurrence (refer to 094D 104) which is approximately 6 kilometres along a topographic lineament to the west-northwest. Mineralization consists of chalcopyrite hosted in cherty limestones of the Lower Jurassic Telkwa Formation (Hazelton Group). This limestone unit is found within red to light grey pyroclastics.

In 1963/1964 work (in part) by Northern Exploration Limited and 1969/1970 work by Roosevelt Exploration Ltd, on the Magnum showing (094D 058) and the Copper showing (094D-120) consisted of sampling, mapping and drilling. Several showings were investigated, and at D prospect (094D 058) a detailed look at fault related mineralization was made as well as drilling.

In 2007, Electrum Resource Corporation held the PAT claim group of 3004 hectares in the vicinity of Mt Patcha, northwest of northern end of Bear Lake. The claims include four MINFILE showings; Magnum (094D 058), Pat (094D 071), Topo (094D 117), and Copper (094D 120), each contained within claims 555997, 531535, 555063 and 555062 respectively. One day was spent in the Magnum occurrence area where 10 rock and 10 soils samples were collected. One day was spent in the Topo occurrence area where 9 rock and 13 soil samples were collected. One day was spent in the Copper occurrence area where 4 rock samples, 1 soil sample and 3 stream sediment samples were collected. One day was spent in the Pat occurrence area where 19 rock, 2 soil ,1 talus fines and 1 stream sediment samples were collected.

Electrum Resources reports that the Topo showing is not accurately located (in the MINFILE database) and although limestone beds were located, no associated mineralization was found near, or at, the stated MINFILE locality.

See Magnum (094D 058) for related geological and work history details.