De or het fosfaatwinning?

The correct Dutch article is:

de fosfaatwinning

Rule Words ending in -ing: almost always de. See the rule

How to use fosfaatwinning

the fosfaatwinningde fosfaatwinning
this fosfaatwinningdeze fosfaatwinning
that fosfaatwinningdie fosfaatwinning
our fosfaatwinningonze fosfaatwinning
your fosfaatwinningjouw fosfaatwinning
every fosfaatwinningelke fosfaatwinning
which fosfaatwinning?welke fosfaatwinning?
a big fosfaatwinning / the big fosfaatwinningeen grote fosfaatwinning, de grote fosfaatwinning