The Clutch 1-4 (JR) occurrence is situated in the headwaters of Ewer Creek, approximately 12.5 kilometres south of Falkland.

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 and include waterlain clast- and matrix- supported lahars and ash to lapilli tuffs that host common opal, agate and a variety of zeolite minerals.

Locally, at the JR zone, precious opal and facet-grade opal were discovered in a red lahar layer of a basaltic andesite. Opal occurs in an agate-rich zone within the lahar. Individual precious opal and facet-grade opal grains are generally fine grained; the largest grain seen was approximately 1.5 centimetres long. The precious opal is clear to greyish translucent with bright play of colours including green, blue, pink and orange. The facet-grade opal shows pale salmon pink to orange to gold colour in whitish slightly translucent grains. Common opal occurs as vesicle filling throughout the agate-rich rocks. Fine free gold associated with quartz vein/agate and opalized material has possibly been identified from the JR zone.

Two other zones (716 and 766) of common opal, agate and diatomaceous earth are reported approximately 650 metres to the southwest of the main (JR) zone. Common opal, agate and minor pyrite mineralization occur as north-trending fracture fillings, whereas at the 716 zone a white diatomaceous earth layer varies from approximately 10 to 15 centimetres thick.

In 1997, a single large grain of dark bluish-grey translucent opal 4 centimetres in diameter was observed in a piece of lahar rubble (Assessment Report 25214).

In 1993, the Clutch 1-4 claims were staked to cover an area of abundant agate mineralization and a program of geological mapping and prospecting was performed through 1997 for precious opal.

In 2017 and 2018, Opal Resources Canada Inc. conducted programs of prospecting, geological mapping, geochemical sampling and trenching on the area as the Klinker/Ewer property. This work was centred on the JR, 716 and 766 zones.