The Turtle Lake occurrence is located on the north shore of Turtle Lake, approximately 15 kilometres north west of Port Alberni.

The area is comprised of porphyritic andesite of the Upper Triassic Karmutsen Formation (Vancouver Group) intruded by diorite. The general topographic features are low-lying hills with linear deep ravines between the hills where swamps and small lake conditions exist. The swamps have varied vegetative cover immediately underlain by 0.6 to 10.6 metres of peat moss. A typical cross-section of the peat moss in the swamps is 0.3 metres of roots and bushes; the next 1.5 to 3 metres is a solid, soft sphagnum moss. Underlying this is a heavy humus composed chiefly of decomposed mosses and old microscopic marine life. The humus and peat encountered in all of the lakes and immediately underlying the heavy peat mosses is a very soft and soupy type of black peat moss suspended in water.

Volcanic ash is found under this peat moss in the swamps and under Turtle Lake, and various test holes indicate that the ash deposits range from 0.6 to 12.1 metres in thickness. The humus material of moss immediately overlying the volcanic ash contains 1 to 5 per cent of fine volcanic ash. Greater thicknesses of ash are located under Turtle Lake which are overlain by slightly lesser thicknesses of peat moss in the range of 1.5 to 7.3 metres. Underlying the ash beds are fine to coarse, clean glacial till and gravel dipping from 2 to 4 degrees and are of undetermined thickness. The ash is a grey colour, very fine and generally composed of 80 to 90 per cent silica with the balance being alumina oxide; moisture content is approximately 22 per cent. A fineness screen test was made of a composite sample taken from the 0 to 9.1 metre horizon in the ash beds. This sample was dried and rolled by hand on a steel plate and the following screen tests obtained:

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          Sample Weight-210 grams
          Screen Fineness         Weight (grams)
          + 30                         30
          - 30  + 80                   20
          - 80  + 100                  2.5
          - 100 + 150                  5
          - 150 + 200                  46
          - 200                        102
          Loss in screening            4.5
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There are three defined areas of measured geological reserves of ash. The Bog E area encompasses the northern half of Turtle Lake and surrounding swamp. Area A within Bog E contains 272,130 tonnes ash, Area B contains 90,710 tonnes ash and Area C contains 45,355 tonnes ash for a combined total of 408,195 tonnes (Assessment Report 233). Hand drilling indicates a further reserve potential of ash in Bog E and also Bog F on the west end of Turtle Lake and in Bog A, at the south and east end of the lake and under the lake.

In 1958, Triassic Minerals Limited completed an exploration program, including 1083.9 metres of rotary drilling. In 1991, Promin Explorations completed a program of mapping and geochemical sampling on the area as the Poz property.