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Hello, I was checking the Table of Ball Mill Index. Regarding the source 1 (Bond), I checked the source and the values are different. I thought the reason was that the values reported by Bond were in short ton instead of metric ton. However, I tried to calculate one value and I still get different results. For instance basalt for Bond is 20.41 kWh/short ton, which multiplied by 1.1 short ton/metric ton gives a higher value (22.45) than the one reported on the website (18.9). Where am I wrong? Thank you!