The Harris Creek showing is located approximately 7 kilometres southwest of Lake Cowichan at the headwaters of Harris and Lens creeks.

A limestone bed of the Upper Triassic Quatsino Formation, Vancouver Group is broken up into five major northwest trending masses by a network of west-northwest and north trending faults. The limestone masses, up to 3 kilometres in length and 1 kilometre in width, occur over a northeast-southwest distance of 3 kilometres. The limestone in individual fault blocks generally strikes west-northwest and dips 20 to 80 degrees north.

The various masses are composed of fine grained, dark grey to black limestone that weathers medium to light grey. The limestone is generally high calcium in composition, although a few magnesian limestone beds are present. Siliceous protrusions are sometimes displayed on weathered surfaces.

A chip sample taken every 6.1 metres along 152 metres of outcrop contained 54.54 per cent CaO, 1.00 per cent MgO, 0.39 per cent insolubles 0.16 per cent R2O3, 0.07 per cent Fe2O3, less than 0.01 per cent MnO, 0.02 per cent P2O5, 0.004 per cent sulphur and 43.65 per cent ignition loss (Minister of Mines Annual Report 1966, page 270, Sample 3).

In 2005 through 2010, Le Baron Prospecting completed programs of rock sampling and prospecting on the area as the Harris Creek Limestone project. Sampling of the limestone, in 2009, yielded values between 54.0 to 55.7 per cent CaO, 0.25 to 1.47 per cent MgO, 0.01 to 0.19 per cent Al2O3, 0.01 to 0.12 per cent Fe2O3, 0.19 to 0.85 per cent SiO2 and 42.30 to 43.82 per cent LOI (Assessment Report 30919).