coal analysis

dear forum

in my experience, coal is the most difficult mineral to analyse because of the large variety of coal qualities and also because of the different measurement bases used

i found this website today (link below) when i was running the ruler over the GMM announcement

i punched the variables, with formulas, into a spreadsheet, so i can compare coal companies and announcements

below is the website link, the website technical info & my spreadsheet

i will try to add another companies into the spreadsheet, to help its accuracy

i hope what i am doing is correct and any feedback is most welcome

for example, when i spoke to GMM today, they said my conversion was not 100% correct

for example, when using the comparative values in the table, i converted 7,200 kcal/kg daf into 5407 kcal/kg ad but GMM said the old Soviet results had 5890 kcal/kg ad

regards

http://majarimagazine.com/2008/06/understanding-coal-sample-analysis/