Appendix 1: Outcrop Rock Units & Geotechnical Summary Rock Type Red Sandstone Volcanic Group Massive Limestone Shale Porphyrite Description Poorly sorted clast supported quartz sandstone with a range of rounded to angular lithic fragments contained within the matrix. Andesite tuffs and flows formed in a phreatic environment. Rhyolite tuffs formed in a phreatic environment associated with plagioclase phenocrysts. Massive basaltic pillow lavas flows associated with chlorite alteration and intensely weathered at surface. Limestone containing calcite crystals in void space. Inter-bedded impermeable shale containing occasional calcite crystals derived from fossiliferous material. Phenocrysts of 17% Orthoclase, 33% Quartz, 30% Plagioclase, 10% Hornblende, 5% Biotite, 5% Muscovite, tr. Sulphides Poorly sorted quartz-lithic conglomerate with some metamorphic fragments of various natures contained within the Conglomerate matrix and clasts of shale, sandstone and limestone. Around the Porphyrite clasts include quartzite, marble, hornfels and quartz. Geotechnical Structure: Well interlocked undisturbed rock with cubical blocks. Surfaces: Good, rough slightly iron stained weathered surfaces. Andesite Structure: Well interlocked undisturbed rock with cubical blocks. Andesite Surface: Moderately altered. Rhyolite Structure: Massive. Rhyolite Surface: Unweathered surfaces. Basalt Structure: Very Blocky Basalt Surface: Chloritic alteration. Structure: Very blocky, with many intersecting discontinuity joint sets. Surfaces: Smooth, calcite coated surfaces. Structure: Very blocky, with many intersecting discontinuity joint sets. Surfaces: Rough, calcite coated surfaces. Structure: Massive in situ rock with few discontinuities. Surfaces: Rough slightly iron stained surfaces. Structure: Massive in situ rock with few discontinuities. Surfaces: Rough slightly iron stained surfaces. N 2 + 400- CONGLOMERATE 500 + MASSIVE HALES RED SANDSTONE SHALES F MASSIVE LIMESTONE Fz 25 LIMESTONE 600· -600- 65 B Legend 8 115 20 40V V ↑30 Red Sandstone Volcanic v Group Massive Limestone Shales Porphyrite Conglomerate □□□ Borehole 160 -m Metamorphic Auriole F = fault. Countours: 100 ༽7” Creek Flow is the equivilant of 75 1000 metres Figure 1: Windy Hill Geology Map (note the rocks listed are not in order and those at depth are not included in the legend but should be included on the Geological Column and History as found in Appendix 2.). 2000