The Port McNeil Andesite prospect is located 7 kilometres west of Port McNeil on top of Cluxewe Mountain. The owner is Tim Henneberry and the operator is Tsitika Stone Industries.

The site occurs as a flat, horizontal lava flow of Miocene age that caps the table shaped Cluxewe Mountain. The stone is exposed in cliffs 5 to 10 metres high. The flow is vertically fractured with spacing up to several metres apart. The surface is smooth, very homogeneous, light grey in colour and almost aphanitic in appearance. This volcanic rock, because of its texture, colour and splitting characteristics, could be used in applications where sandstone would normally be used. In contrast to British Columbian sandstones, this type of andesite has an excellent performance record and durability in the coastal climate (see 092L 146).

The Port McNeil andesite is a buff, very fine-grained andesite. The rock is made up of a dense mat of feldspar laths with biotite disseminated or forming small clumps throughout creating a slight speckle to the appearance. Minor constituents are magnetite and quartz with weak sericite alteration of the feldspar. The cut, unpolished rock has a very uniform texture with no alteration, staining and minor, tight cracking visible. The rock has uniform void space (vugs) about 0.2 millimetre in diameter and form approximately 1 per cent of the rock. Thin section work indicates the rock is not microfractured and so is probably quite impermeable, though slightly porous.

During 1995 through 1997, Mammoth Geological, on behalf of R.T. Hennebery, completed programs of prospecting on the area as the Clux 1 claim.