The Dump limestone showing is located on the northwest side of the Nimpkish River, west of the Island Highway, approximately 6 kilometres south-southeast of the community of Nimpkish.

The area is underlain by white limestone of the Quatsino Formation of the Triassic Vancouver Group. The most common limestone varies in colour from white through white-grey to grey-white. Texture ranges from fine (1 millimetre) to coarse (4 to 5 millimetres), though generally lies in the medium range (2 to 3 millimetre). The stone ranges from clean to traces of fracture clays and limonite. Occasionally blebs of darker grey limestone (10 to 15 millimetres) are encountered forming 1 to 2 per cent of the total mass.

Work History

In 1993, the area was first prospected and mapped. A whole rock analysis was completed on one sample of grey-white limestone. The test confirmed the grey-white limestone is suitable for low end filler applications (Assessment Report 23327). Two additional samples were tested, in 1995, for both whole rock analyses and brightness. These further tests confirmed the white-grey limestone on Dump property is suitable for low end filler applications (Assessment Report 24347). In 1996, a follow-up program consisted of a cross-stratigraphy sampling line. After logging succeeded in opening a large exposure of white limestone in 2004, additional claims were staked and the new exposures were mapped and sampled. Four of the samples were chemically analyzed and also tested for brightness. The results confirmed the suitability for filler applications (Assessment Report 27887).

In 2008, South Aggregate Resources sampled the limestone, over a 1200 by 300 metre area, has returned results of 88.29 to 99.99 per cent CaCO3 with 0.50 to 2.16 per cent insolubles. To the northwest, the section is dolomitic ranging from 2.05 to 11.67 per cent MgCO3 (Assessment Report 31001).

In 2013, Mammoth Geological Ltd. completed a minor program of rock sampling on the area as part of the North Island Carbonate project. Four samples of coarse-grained white limestone yielded from 90.06 to 97.00 per cent calcium carbonate, 1.88 to 7.34 per cent magnesium carbonate and 0.74 to 3.13 per cent insolubles (Assessment Report 35070).