The deposit is unusual in that it has leucoxene as its major constituent which makes the heavy mineral suite
of higher value than the ilmenite dominated deposits normally found in south-west of Western Australia.
The clay mineral suite
of each sample was then determined by X-ray diffraction of the 2 tiles, using a Siemens Diffraktometer 5000.
Noting that gold occurrences such as the big Pipeline Deposit are now starting to be found in the valleys as well as the flanks on the ridges, Tri- Valley has arranged for its sister company, Select Resources Corporation, to assay samples from the first 500 meters of its Midland Trail oil prospect well bore to learn the mineral suite
of the area and determine if additional mineral prospecting should be conducted.
Altogether 200-500 mineral grains were counted in each mineral suite
and the results were expressed in the percentages of the respective fraction.
The indicator mineral suite
found to date is similar in composition to that found by Ashton, which is not comparable to the classical model for diamondiferous kimberlite with the associated G10 garnets.
The primary mineral suite
of each topsoil was characterised by X-ray diffraction of random powders, which had been ground to pass through a 50-[micro]m sieve.
The grain morphology, indicator count, grain size and mineral suite
reflect an underlying source whilst the grain geochemistry confirms its kimberlitic origin.
The macrocyrst mineral suite
of both kimberlite boulder trains is dominated by coarse olivine, with purple and orange garnets and ilmenites present in lesser amounts.
Table 2 Atlas: Resource Estimate Heavy Mineral Suite
Ilmenite accounts for about 65% of the heavy mineral suite
with lesser amounts of rutile and zircon also present.
The entire group of host rocks has been altered to the greenstone-facies mineral suite
of sericite, chlorite, biotite, carbonate and quartz.
Tiomin will be initiating a reconnaissance sampling and mapping program in early December to categorize the grades and product quality of the mineral suite
present which is known to include ilmenite, rutile and zircon.