2023-10-31_REVISION - M1973021 (21)

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�00 "TWINING CONCRETE INSIGHT Morrison Quarry Phase II Rock Petrography Page 2 3.0 PROCEDURES After writing the TCI sample number on each received sample, each sample was measured and inspected visually. Each sample was then photographed in its as-received condition. Slabs representing cross sections of the samples were cut using a MultiQuip® TP-10, a 10-inch diameter water-cooled tile saw. These sections were rinsed and oven dried in a Gilson® Bench Top laboratory oven at —43°C (-110°F). After drying, each piece was labelled with the appropriate TCI sample number. One piece was set aside for thin section preparation and the other was lapped and polished on a Diamond Pacific® RL-18 Flat Lap machine. This machine employs an 18-inch diameter cast iron plate onto which Diamond Pacific® Magnetic Nova Lap discs with progressively finer grits are fixed. The Nova Lap discs consist of a 1/16 in. backing of solid rubber containing magnetized iron particles that is coated with a proprietary Nova resin- bond formula embedded with industrial diamonds of specific grit. The slab preparation involved the use of progressively finer wheels to a 3000 grit (-4 µm) final polish. An aqueous lubricant is used in the lapping and polishing process. The polished slab was examined visually, photographed and then examined with a Nikon® SNM-25 stereomicroscope with 3-158x magnification capability. Petrographic thin sections were prepared by cutting billets from a rectangular block (billet) cut from each rock sample. The billets were labeled with their unique TCI number and were then fixed to glass slides with epoxy. The slide was ground and polished to a thickness of—30 µm (1.2 mil)was achieved. The thin sections were examined with a Nikon® E-Pol 600 petrographic microscope equipped to provide a 20-1000x magnification range. Report No. 237923.d 20 February 2023