In one hole drilled by partner Newcrest, the mineralisation extended for 94 metres (m) at a grade of 4.5 grammes per tonne (g/t) with 45m at 7.1 g/t in another.
Greatland added that the latest results have extended the area of mineralisation to the north and at depth, with gold indications now being seen down to 950m.
Newcrest started drilling at Havieron in May and has now begun a second phase with six rigs operational at the site.
The Aussie major has also met its exploration commitment to spend US$5mln ahead of schedule.
Gervaise Heddle, Greatland’s chief executive, said he was delighted with the latest outcome.
“These results further extend the limits of known mineralisation, with mineralisation now observed over 950 metres of vertical extent, and underline our belief that Havieron could become a large, underground mining operation," he said in a statement.
"In particular, I would like to highlight the outstanding results from hole HAD018, which confirm the presence of higher-grade mineralisation on a step-out drill section to the north where HAD012 also previously intersected higher-grade mineralisation.”