Methodical delivery of MRQ results by Management, page-48

Here is an excerpt taken from the net regards HMS deposits and grades.

https://en.wikipedia.org/wiki/Heavy_mineral_sands_ore_deposits

Grade and tonnage distribution[edit]

The grade of a typical heavy mineral sand ore deposit is usually low. Within the 21st century, the lowest cut-off grades of heavy minerals, as a total heavy mineral (THM) concentrate from the bulk sand, in most ore deposits of this type is around 1% heavy minerals, although several are higher grade.

Of this total heavy mineral concentrate (THM), the components are typically

• Zircon, from 1% of THM to upwards of 50% of THM,
• Ilmenite, generally of 10% to 60% of THM
• Rutile, from 5% to 25% of THM
• Leucoxene, from 1% to 10% of THM
• Trash minerals, typicallyquartz,magnetite,garnet,chromiteandkyanite, which usually account for the remaining bulk of the THM content
• Slimes, typically minerals as above and heavy clay minerals, too fine to be economically extracted.

Generally, as zircon is the most valuable component and a critical ore component, high-zircon sands are the most valuable. Thereafter, rutile, leucoxene and then ilmenite in terms of value given to the ore. As a generality, typically the valuable components of the THM concentrate rarely exceed 30%.

Being ancient stranded dune systems, the tonnage of most deposits is in excess of several tens of millions of tonnes to several hundred million tonnes. For example; the medium-sized Coburn mineral sands deposit,Western Australia, is 230 million tonnes at 1.1% heavy minerals, and is 13 km long.

The Tormin mine, on the Western Cape of South Africa's coastline, provides a unique ocean beach feature, which exposes the resource to wave and tidal conditions that result in a natural jigging effect. Large proportions of the quartz and light heavies waste material are removed by the ocean tidal action,^[2]resulting in run of mine (ROM) grades as high as 86% heavy mineral concentrate (HMC)