Weigh and record the weight of the gross moisture
sample. Spread the sample on the drying floor to a depth of not
more than twice the top size of the coal. Mix or stir the coal
from time to time, being careful not to lose any of the coal
particles. Continue the air drying and mixing until the surface
of the sample appears dry. Weigh the entire sample and
redistribute over the floor for additional drying. Continue the
drying and stirring, weighing at 1- to 2-h intervals until the
weight loss of the total sample becomes no more than 0.1 %/h
(Note 1). Record the weight of the air dry sample.Avoid excess
drying.