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Roaring Lion: On the Roaring Lion River, just to the east of the Karamea Batholith,
stockworks of quartz-orthoclase-molybdenite veins occur in metasedimentary rocks in three
separate areas - the Discovery, Cobra and Grace prospects - discovered by Kennecott
geologists in 1971 and 1972 (Foster 1971b; Turbott 1972a, 1972b, 1972c; Hay 1980a, 1981).
The country rocks of Ordovician sandstone, siltstone and quartzite of the Aorere Group are
hornfelsed and intruded by small stocks of fine grained granodiorite. The quartz veining is
controlled by pre-mineral joint sets, probably related to regional folding.
Discovery Prospect (M26/e516) covers an area of 1.5 km x 1 km (defined by the 10 ppm Mo
in rock isopleth) within a larger area of low topography and few exposures (Walker 1982).
Molybdenum assays range from 2 to 474 ppm Mo, but there is “no obvious centre or target”
(Roberts 1989). Molybdenite and pyrite are present in quartz veins.
At Cobra (M26/e515), the 10 ppm Mo in rock isopleth defines an area of 1 km x 0.9 km. The
best stockwork veining is on Cobra Face (Figure 92), a quartzite dip slope where areas of
10% veining are common. Individual veins range up to 30 cm thick, but generally they are
less than 1.25 cm thick (Foster 1971b). Molybdenite is accompanied by minor pyrite and rare
chalcopyrite, with local traces of galena, sphalerite, magnetite and pyrrhotite. Three diamond
drillholes totalling 820 m were drilled by Amoco and BP into the metasediments at Cobra, but
failed to intercept intrusive rocks (Hay 1980b; Christie 1982; Roberts 1983). They yielded a
best assay result of 790 ppm Mo over 5 m.
Hope this helps and yes it took me thirty minutes of reading through 125 pages to get to it!
Here is the reference for you…noted a photograph that Keith might be able to locate on the ground.