help with coal quality, page-2

Not trying to downramp, but this worries me..... I would really appreciate it if someone with more knowledge than me could put in their 2c worth.

http://africabusiness.com/tag/steam-coal/

For steam coal offer, here is the summary price
1. ADB 6700 to 6500 kcal/kg : $119
2. ADB 6500 to 6300 kcal/kg : $103
3. ADB 6300 to 6100 kcal/kg : $90
4. ADB 6000 to 5800 kcal/kg : $85
5. ADB 5800 to 5600 kcal/kg : $82
6. ADB 5500 to 5300 Kcal/kg : $75
7. ADB 5300 to 5100 Kcal/kg : $63
8. ADB 5100 TO 4900 Kcal/kg : $56
THE PRICE LC PER METRIC TON FOB BASIS ON VESSEL