The Claudia (Dan 32 and 37) occurrence is located near the summit of a small hill separating the headwaters of Ewar and McGregor creeks, approximately 2.4 kilometres north-northeast of Hailstone Mountain.

Regionally, the area is underlain by volcanics, mudstone, siltstone, shale and fine clastic sedimentary rocks of the Devonian to Triassic Harper Ranch and(?) Nicola groups, which are intruded by Middle Jurassic granitic rocks. Extensive volcanic and sedimentary rocks of the Eocene Kamloops and Penticton groups overlie the older units.

The area contains several concentrations of precious opal developed in the basal 100 metres of the Kamloops Group. The hostrock is a volcanic breccia-lahar complex composed of angular to rounded clasts of andesite and basalt ranging from 0.2 to 0.6 metre in diameter in a lapilli tuff matrix. In the lahar, the tuff has bedding that swirls around the clasts. Lapilli tuff lenses up to 5 metres thick develop locally and indicate that the volcanic succession dips 20 to 30 degrees to the west. Thin andesite or basalt flows and intrusions up to 4 metres thick are scattered throughout. See the Klinker (MINFILE 082LSW125) occurrence for more information.

Locally, silicified vesicular basalts host amygdule fillings and occasional fracture fillings of quartz, agate, chalcedony and calcite with rare common and precious opal. Vesicles vary in size from less than a millimetre to several centimetres and are commonly slightly to moderately elongated. The common opal is generally opaque white or pink to honey coloured, whereas the precious opal is generally translucent white with flashes of red, green and/or blue. In places the vesicular basalt is hematite altered to a reddish-colour, referred to as ‘klinker rock’. Zeolite is also reported in the area.

In 1988, Mono Gold Mines Inc. completed a program of soil sampling on the area immediately west as the Way 1-2 claims. In 1993, the area was prospected and sampled for opal mineralization as the Dan 19-35 claims. During 1994 through 1996, Big I Developments Ltd. completed programs of geological mapping, soil sampling, a 10.0 line-kilometre combined ground magnetic and electromagnetic survey and a 0.7 line-kilometre self-potential survey on the area immediately west as the Way 1-2 claims. In 1997, T.G. Cook prospected the area immediately west as the Way 1 claim. This work identified agate and minor opal near the southeastern corner of the claim.

In 2017 and 2018, Opal Resources Canada Inc. conducted programs of prospecting, geological mapping, geochemical sampling and trenching, totalling 450 square metres, on the area as the Klinker/Ewer property.