The protesters took out silent procession two days ahead of the NGT hearing here scheduled on August first and demanded immediate lifting of the ban.
They carried black flags and placards reading 'Is aquatic life in rivers more precious than human lives for the NGT' and 'We demand our rights to life.'
Organiser of the march, "Movement for Indigenous People's Rights and Livelihood - Meghalaya" (MIPRLM), said it would draw the attention of Prime Minister Narendra Modi to the matter.
"We urge the Centre and state government to work together to bring relief to the people who have been severely affected by the ban. We will also meet Union Finance Minister Arun Jaitley and inform him of the huge loss of revenue by the state government due to the ban," he said.
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The NGT Act was passed in 2010 without taking the Meghalaya government and the autonomous district councils into consideration, he added.
Official sources said the total quantified amount of coal is about nine million metric tonne left in open quarries and depots in the state.