THE DRILL SERGEANT: Bulk minerals explorer Sheffield Resources has released the results from a 30 hole drilling program at its McCalls heavy mineral sand exploration project.
The project is located 110 kilometres north of Perth, near Gingin in Western Australia.
Of the 30 holes drilled, all returned mineralised intervals of greater than one per cent Heavy Mineral (HM), with all but two of the holes ending in mineralisation.
One drill hole was extended in order to test the depth potential of the deposit.
This 85.5 metres of mineralisation and was still in mineralisation at the end of the hole.
Drilling results that recorded significant intersections included:
– 85.5 metres at 1.52 per cent Heavy Mineral from 4.5 metres;
– 58.5m at 1.49% HM from 4.5m;
– 61.5m at 1.32% HM from 1.5m;
– 49.5m at 1.52% HM from 1.5m; and
– 45m at 1.60% HM from 6m.
“These drill results are excellent, and improve on both the average grade and the dimensions of the deposit as outlined by BHP’s prior drilling; confirming our belief that McCalls is potentially a very large scale, high titanium ilmenite project with significant zircon credits,” Sheffield Resources managing director Bruce McQuitty said in an announcement to the Australian Securities Exchange.
McQuitty also said the drill results exceeded the expectations set by historic work at McCalls.
The 30 hole drilling program was designed by Sheffield to infill earlier broadly spaced drilling carried out by BHP, which had explored the McCalls region during the early 1990s.
On one section Sheffield completed 25 drill holes to infill 8 holes drilled by BHP.
What the company found to be of significance is that the average width and grade of the latest drill intersections is higher and the average slimes component lower than those of the BHP drill intersections.
In a release to the ASX in January Sheffield declared an Exploration Target for McCalls of between 1.5 billion tonnes and 2.5 billion tonnes grading between 1.1 per cent HM and 1.3 per cent HM.
The average heavy mineral grade of 1.35% for all intersections achieved from the recent drilling program is above the higher target range.
Sheffield considers this suggests either the presence of a large zone of higher grade material within the overall deposit, or a conservative grade estimate for the Exploration Target.