1. Aggregate production
Natural aggregates are produced in quarries (figures
1
and
2
), each of which represents
a temporary occupation of the land, a parenthesis in the history of
the site.
Definition reminder
Aggregates are granular materials up to 125 mm in size, plus rockfill
larger than 125 mm but weighing 15 tonnes or less. They are designated
by their smallest and largest dimensions d and D, the interval d/D
being called granular class. This designation admits that some elements
can be retained on a square-meshed sieve of aperture D (D sieve) and
that others can pass through the d sieve, within the standardized
limits...
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Aggregate production