The Alpo occurrence is located approximately 2.5 kilometres south of Lady King Lake and 11 kilometres southeast of Westwold.

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 Alpo zone, red (oxidized) coarse matrix-supported lahars contain vesicle fillings of common opal, white zeolite (analcime) and a yellow-brown sugary zeolite. One discontinuous fracture filling through a basalt clast, 0.5 centimetres in width, was reported to contain agate (Assessment Report 25409).

Another area of agate, white opal and hyalite opal, referred to as the 505 zone, is located approximately 1.3 kilometres to the southwest of the Alpo zone. The zone is hosted by a brecciated(?) or matrix lahar rhyolite flow and has been exposed over an approximate area of 20 by 2.5 metres. Precious opal has also been reported approximately 2.5 kilometres east of the Alpo zone on the former Red Rock 5 claim.

The Lady King Basalt zone is located approximately 400 metres north of the Alpo opal zone and has been explored for its use as landscape and decorative stone. Diatomaceous earth is also reported in this area.

In 1994, the area immediately east was prospected as the Flash 1-3 claims. The Alpo claims were staked in 1995 by Okanagan Opal Inc. after the discovery of agate and white common opal float, with programs of sampling and geological mapping being completed over the next 2 years.

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 Lady King Basalt and diatomaceous earth zones and the 505 zone. At this time, approximately 2500 tonnes of columnar basalt had been extracted and stockpiled and a 110-tonne sample moved off site.