The Allison Tunnel molybdenum bearing intrusive breccia pipe occurs to the southwest and adjacent to the DUV target area and was one of the principal areas of underground workings development along Emigrant Creek. The Allison breccia pipe itself appears to be small, about 45 meters (150 feet) in diameter (Pfau 1981), However the breccia is surrounded by a mineralized stock work of molybdenite bearing veins at depth turning to copper–molybdenum bearing veins near surface.
Alteration in the Allison Tunnel area is similar to that of the DUV Area and this pipe is probably part of the same Copper-Molybdenum System (Green 1976). Modeling shows that from the top of DUV mineralized zone to the molybdenum bearing intersection in hole 73-01 is a vertical range of 900 meters, which gives an indication of the size of the zonation on the system. A low angle easterly dipping fault with breccia is inferred on the slope above the Allison Tunnel and this-fault may host the molybdenum-bearing breccia zone reported from underground in the Allison Tunnel (Harrison 1990).
A hole drilled in 1973 by Duval intersected the breccia zone at a depth of 300 meters below the Tunnel and intersected 73.2 meters grading 0.112% MoS2. Pegasus drilled holes DU92-16 and 17 angled at – 45 degrees to the north and south respectively from a pad south of the Allison workings. The holes intersected strong stockwork mineralization with copper and molybdenum, DU91-16 intersected 50.3m (165 feet) grading 0.031% MoS2 and 0.21% copper in the copper-molybdenum zone of the breccia above the Allison Tunnel. Gold assays were low, as expected as gold is not expected to be present in the well-developed hydrothermal breccia and stockwork molybdenum mineralized zone.