De or het exploratieboring?

The correct Dutch article is:

de exploratieboring

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

How to use exploratieboring

the exploratieboringde exploratieboring
this exploratieboringdeze exploratieboring
that exploratieboringdie exploratieboring
our exploratieboringonze exploratieboring
your exploratieboringjouw exploratieboring
every exploratieboringelke exploratieboring
which exploratieboring?welke exploratieboring?
a big exploratieboring / the big exploratieboringeen grote exploratieboring, de grote exploratieboring