menu
Steve Willis
June 16, 2020
5:10 a.m. PDT

Chemical compositions

Good Afternoon
What is the chemical composition of the sand and the THM?
Many Thanks
8 Replies

Martin Theberge moderator
June 16, 2020
5:33 a.m. PDT
Hi Mr Willis,

Sands are mainly composed of Quartz, feldspar and Heavy minerals. The main THM mineralogical suite includes: Titatium Oxyde minerals like Ilmenite, Rutile, leucoxene (that containes Fe and TiO2), zircon (ZrO2) and magnetite (Fe3O4).

Regards

Steve Willis
June 16, 2020
7:13 a.m. PDT
Thanks Martin
How deep are these sand deposits?
Does the current process reach all the way to the bottom of the deposit?

HEES moderator
June 16, 2020
7:57 a.m. PDT
Hi Steve,
These sand deposits can be over 100m thick, and the current dredging mining process does reach down to the bottom. But instead of mining down, the sand actually free flows downwards by gravity to the dredge pond (like a landslide).

Steve Willis
June 16, 2020
4:29 p.m. PDT
@Martin Theberge
What is the approximate value of the recovered ore, in $ per tonne

Steve Willis
June 16, 2020
4:31 p.m. PDT
@HEES
Fascinating
How and when were these deposits formed geologically?
Do they cover large contiguous areas, or do they form smaller patches?

HEES moderator
June 16, 2020
4:57 p.m. PDT
Heavy Mineral Sands are generally young geological deposits, recently formed (mostly Quaternary). Their genesis relates to the natural cycle of erosion - transport and sedimentation/concentration. They normally cover large areas when disseminated in sand dunes for instance, or can be highly concentrated, but in small areas, such as strandlines.

Steve Willis
June 16, 2020
8:16 p.m. PDT
@HEES
Thanks Hess

How many hectares/km2 does a large deposit cover?
What size is a small deposit, small but still interesting enough to develop?

HEES moderator
June 18, 2020
8:28 a.m. PDT
A large deposit can have a large surface coverage, say tens of kilometers by tens of kilometers. For easy visualization, imagine a land surface of 30km by 20km.
However, some very high grade deposits, yet economically viable, may have smaller footprint, say surfaces of hundreds of meters wide by a couple of kilometers long.
Post Your Reply