Ann: High Grade REE and Niobium Confirmed at Lyons, page-82

"Have to take into account what impact the northern wet season, which is typically November to April"

No disrespect, but it is important to note the Gascoyne is mostly subtropical.
Mangaroon is above the 26th parallel, but below the tropic of capricorn.
So actually not tropical.
There is no wet season in that region, and most seasonal rain falls in July/Aug, if at all.
I lived in the region for years, and we often wouldn't see clouds, let alone rain for a couple of years.
(Tropical lows excluded which could be expected Nov onwards, but would be super weak by the time they got that far inland.)

I would not anticipate weather would be an issue for the drilling schedule, unless it is an outlier event.