The KNOB HILL showing is located on top of Mullins Hill, approximately 8 kilometres northeast of Carmi.
The showing occurs in a contact zone between metasediments of the Carboniferous-Permian Anarchist Group and quartz diorite of an unnamed Middle Jurassic Intrusion. This intrusion was previously mapped as Middle Jurassic Nelson Intrusions (Geological Survey of Canada Map 1736A). The garnet may be a result of high grade metamorphism and not skarnification. Mineralization consists of specks of chalcopyrite, molybdenite and pyrite in small lenses of garnet skarn and disseminated in hornfelsed contact zones associated with dikes. Mineralized areas are "capped" by a thick, hard layer of iron oxides.
This was an active exploration camp at the turn of the century when the Highland Bell (082ESW030) silver mine was discovered. Early references indicate a 12-metre shaft was sunk in an "iron cap" on the KNOB HILL in 1901. This claim was Crown granted as KNOB HILL (L.2659) in 1903. Numerous old workings, trenches, pits and open cuts occur in the general area of Mullins Hill. Those to the northeast are grouped under the ROSEMONT (082ENW046) occurrence 1.5 kilometres away, and those to the south are grouped under the IVY (082ENW037), which is located approximately 2 kilometres to the south.
In 1975, Vestor Explorations Ltd. drilled 2 percussion drillholes along the road immediately west of Mullins Creek. This was followed by 3 percussion holes in 1976. No results were filed in the assessment reports. An old 7.6-metre shaft noted on the drill plan may be the partly filled in shaft sunk in 1901.