This occurrence is situated 6 kilometres east of the head of Holberg Inlet on its south shore, 34 kilometres southwest of Port McNeill.

A discontinuous belt of limestone of the Upper Triassic Quatsino Formation (Vancouver Group), commonly segmented by north to northwest-trending faults, extends west-northwest from Quatsino Narrows at the entrance to Holberg Inlet along the south side of the inlet for 53 kilometres to William Lake. The belt is bounded to the south by overlying volcanics of the Lower Jurassic Bonanza Group and argillite and black limestone of the Upper Triassic Parsons Bay Formation (Vancouver Group). Underlying mafic volcanics of the Upper Triassic Karmutsen Formation (Vancouver Group) occasionally outcrop along the northern margin of the belt.

Three masses of limestone are exposed in the central portion of a 1.8-kilometre wide rectangular fault block that extends southeastward from the shore of Holberg Inlet for 2.5 kilometres. The western-most deposit outcrops over a 1.8 by 1.3 kilometre area (190 hectares). The mass is underlain by chloritic, amygdaloidal basalt of the Upper Triassic Karmutsen Formation. Variably amygdaloidal Lower Jurassic Bonanza Group (?) volcanics outcrop around the east, west and south sides of the deposit.

The western deposit is comprised of fine-grained, white to dark-grey limestone that is commonly cut by calcite veinlets. Minor sulphides are present. The limestone becomes intercalated with some tuff, basalt and vesicular andesite in a few places. An analysis of various grab samples assayed 38.8 per cent calcium, 0.718 per cent magnesium, 0.23 per cent silica, 0.1 per cent aluminum, 0.1 per cent iron, 0.011 per cent phosphorus, 0.01 per cent sulphur and 43.40 per cent ignition loss (Assessment Report 5413). Reserves in the western deposit are estimated at 236 million tonnes of limestone over a minimum thickness of 46 metres. (Assessment Report 5666)

Between 1971 and 1980, World Cement Industries Inc. carried out 1529 metres of diamond drilling accompanied by some mapping and sampling. The limestone was to be used to supply a cement plant that the company proposed to construct at Nanaimo with a capacity to manufacture 900 000 tonnes of cement a year.

In 1993, David Pawliuk completed an exploration program of geological mapping and rock and heavy mineral sampling in search of copper and gold. Highlights include a grab sample of malachite-stained, maroon and green basaltic flow containing disseminated chalcopyrite that assayed 1.4 per cent copper (Assessment Report 23376).

The property was staked in 2002 as the 007 property by William Gilroy who, accompanied by B. Ainsworth, completed geological mapping and chip sampling. Highlights include sample RG-4, which assayed 40.62 per cent calcium and 0.63 per cent silica (Assessment Report 26913).

In 2003, B. Ainsworth and William Gilroy completed geological mapping and grab sampling. Highlights include sample BG-06, which assayed 40.07 per cent calcium, 0.11 per cent silicon, 0.19 per cent magnesium and 0.04 per cent iron (Assessment Report 27221).