REE L 8.4% Carbonatite Wigu TZ

Description

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AMIS0185 REE Wigu Carbonatite Complex, Tanzania

Origin of Material: AMIS0185 is a commissioned CRM made up of material supplied by Montero Resources Ltd. from the Wigu Carbonatite Complex located 200km WSW of Dar es Salaam.  Wigu Hill is underlain by Paleoproterozoic metasediments consisting of well foliated high grade gneisses and amphibolites. These rocks have been intruded by a swarm of carbonatite dykes on the southern edge of the Uluguru Mountains where the Uluguru massif is truncated by a major Karoo aged rift.  The intrusions have resulted in strong carbonate alteration of the gneisses and amphibolites adjacent to the dykes and a more pervasive fenitisation and weaker carbonate alteration halo away from the dykes.

Mineral and Chemical Composition: The carbonatite material selected for this sample is fresh, compact and tightly and finely crystalline. It is bastnasite-rich with minor amounts of synchisite, parasite and monazite, with traces of apatite. The carbonatite is dolomitic with a significant proportion of Rare Earth Oxide minerals (REO’s) and lesser associated quartz, barite, strontianite, iron oxides and minor manganese.

Regional sampling to date has identified that the main rare earth minerals present in the Wigu carbonatites are the light rare earths, namely Cerium, Lanthanum, Neodymium, Praseodymium, and Samarium.  Minor amounts of Europium and Gadolinium are present, but the other heavy rare earth elements are present in trace amounts only.

Recommended Concentrations and Limits^1.

(at two Standard Deviations)

Certified Concentrations

Provisional Concentrations

Informational Means