Coal knowledge
Coal, explained plainly
The terms and systems every coal trader deals with — in plain words, with the official source beside each one. For anything else, ask Coal Boss.
Coal quality
Explainer
What is GCV in coal?
Gross Calorific Value — the heat a coal gives when it burns, and the number that most decides what non-coking coal is worth.
Official information, summarised
G1 to G17: how non-coking coal is graded in India
The Ministry of Coal grades non-coking coal into 17 GCV bands. Where that grading applies — and where traders deal in GCV itself.
Explainer
Ash, moisture and proximate analysis
The four numbers on most coal lab reports — moisture, ash, volatile matter and fixed carbon — and why moisture changes everything else.
Explainer
Coal sampling and testing
A lab result is only as good as the sample behind it. How coal is sampled, and why disputes usually start there.
Explainer
ARB, ADB and dry basis: why the same coal shows different numbers
As received, air-dried, dry — the basis a lab reports on changes the GCV and ash you see. How to compare two reports fairly.
Explainer
GCV vs UHV: how India's coal grading changed
Why non-coking coal in India is graded by GCV (G1–G17) today, and what the older UHV-based grades were.
Buying coal
The coal industry
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