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chemical compositions as shown in Table 2. Granite world average <br />composition is estimated at 72.04% SiO2 (Blatt and Tracy, 1996) <br />while soda-lime glass comprises about 74% SiO2 (Shelby, 2005), <br />although soda-lime glass around Swedish glassworks ranged <br />between 55 and 85% SiO2 (Hermelin and Welander, 1986). Further- <br />more, granite has a wide resistivity range of 1000–1,000,000 Xm <br />(Palacky, 1987), implying that different resistivities within this <br />range can be obtained for granite bedrock such as at Alsterfors. <br />For successful identification of glass hotspots, bedrock characteris- <br />tics must be factored in, meaning that in sites with bedrock that do <br />not possess glass characteristics, hotspots could be identified much <br />easier. <br />Fig. 5.Resistivity profiles at Alsterfors dump; (a) line AL1; (b) line AL2; (c) line AL3; (d) 3-D view of the three lines. <br />220 R.N. Mutafela et al./Waste Management 106 (2020) 213–225