Appendix B - Global Stability Assessment Report

                                                       -7-
                                                                                               Job No: ME21/032

4.0        SUBSURFACE CONDITIONS

           4.1 Regional Geology

Reference to the State of Queensland Department of Natural Resources, Mines and Energy (DNRME),
Queensland Globe (2020) indicates that the surface and near-surface geology near the project
alignment comprises middle Triassic aged sedimentary beds with intrusive bodies of middle tertiary
aged igneous rock (refer Table 1).

                                  Table 1 – Regional Geology Summary

 Rock Unit          Map             Lithological             Dominant
                                                                                   Rock Type             Age
   Name            Symbol            Summary                   Rock
 Allandale
                                Arfvedsonite-bearing                           INTRUSIVE            Mid-Tertiary
Arfvedsonite          Ta                                 GRANITOID
                                granite                                           UNIT              (~ 30Mya)
  Granite
                                Strongly cleaved
                                and commonly                               STRATIFIED
                                kinked mudstone                                UNIT
                                                         ARENITE-                                   Mid-Triassic
Kin Kin beds          Rk        with thin siltstone                        (INCLUDING
                                                         MUDROCK                                    (~ 245Mya)
                                laminae; minor                            VOLCANIC AND
                                volcanilithic                             METAMORPHIC)
                                sandstone

           4.2 Local Subsurface Conditions

The subsurface profile encountered within the boreholes typically comprised a layer of fill underlain by
a residual soil profile underlain by highly weathered (HW) rock. The following gives a brief summary of
the subsurface profiles encountered. Refer to Table 2 and Appendix B for further detail.

          Fill material was encountered in all three boreholes to depths of between 1.2m and 4.0m and
           was generally described as: Gravelly/Silty CLAY, stiff to hard and of high plasticity.

          Residual material was encountered in all three boreholes to depths of between 2.3m to 5m and
           was generally described as Sandy/Gravelly CLAY, hard and of medium plasticity.

          Granodiorite/Granite Rock (HW) was encountered in boreholes BH1 and BH3 at depths of 2.3m
           and 5.0m respectively. Rock was not encounterd in borehole BH2, most likely due to its
           termination depth of 3m. The rock encountered was generally described as highly weathered
           and of very low strength, recovered as Sandy/Gravelly CLAY, hard and of medium plasticity.

A summary of the profiles encountered in the boreholes is given in Table 2.

                    Table 2 – Summary of the Subsurface Profile in the Boreholes

                            Fill Material (m)                   Residual (m)             Weathered Rock (m)
  Borehole                            Gravelly/Silty           Sandy/Gravelly
                    Silty CLAY                                                            HW Granodiorite
  Number                                CLAY (CH)                CLAY (CH)
                        Stiff        Very Stiff to Hard             Hard                 Very Low Strength

          BH1              NE              0.0 - 1.2               1.2 - 2.3                    2.3 - 6.0TD
                                                                              TD
          BH2           NE                 0.0 - 1.9              1.9 - 3.0                        NE
    BH3           0.0 - 4.0             NE                 4.0 - 5.0                 5.0 - 6.0TD
 Notes:
    1. All depths below the existing ground surface level as at the time of field work on the 4/11/21.
    2. TD = Termination Depth
    3. NE = Not Encountered



Ref: 27222-rev 1                                                                     MORRISON GEOTECHNIC
Mr Geoff Hussin