Melde mich aus meinem Osterurlaub zurück.
Schaut euch mal den technischen Report zur Resourcenschätzung an:
www.commerceresources.com/i/pdf/BR43-101.pdf
Ich habe mir den Report mal angetan. Ist nicht leicht zu lesen, ich verstehe auch nicht alles, dennoch sind mir ein paar wichtige Punkte sehr positiv aufgefallen:
Uran, Seite 102:
"The only known environmental/metallurgical issue that could affect the development of the resource would be the uranium and thorium content of the mineralized carbonatite. Analyses indicated that both elements are present in low amounts in the carbonatite. Other than 4 samples, all of the 8,122 drill results were below the 0.05% uranium and 0.01% thorium thresholds as defined in the “Health, Safety and Reclamation Code for Mines in British Columbia” (May 1998) – Part 9.3.4 (amended in 2008)."
Damit wird also die Aussage, die Tamara mir letztes Jahr erteilte, bestätigt. Die Urangehalte stellen bisher kein Problem dar.
Das absolute Highlight aus meiner Sicht fand ich auf den Seiten 88 ff:
"Bulk sampled material collected from three pits is currently undergoing metallurgical test at Met-Solve Laboratories Inc. in Burnaby, BC. Work includes gravity and flotation processes to recover the Ta- and
Nb-bearing minerals (principally pyrochlore and ferrocolumbite) within the Upper Fir carbonatite.
The first series of tests was designed to establish the liberation size and general separation characteristics of the Ta and Nb material from the bulk samples. A relatively coarse primary grind to a P80 of 135
microns was sufficient for full liberation of the Ta and Nb bearing minerals, confirmed by microprobe and Qemscan.
The second series of tests were designed to reproduce the results obtained in 2007 using gravity concentration by centrifugal concentrator and shaking table. The program was successful in achieving similar results but on a new bulk sample of known representivity (Table 16-1).
The third series of tests was designed to test flotation as a primary method of concentration. The proven
process industrially used at Iamgold’s Niobec Mine in Quebec was tested. The first set of tests for
desliming, carbonate removal and rougher flotation of tantalum and niobium minerals were successful in
achieving results similar to Niobec. These results were better than those achieved previously by the
gravity method alone. Results for test F6 and F10 are shown as examples (Tables 16 - 2 and 16 – 3).
Table 16 - 2 Flotation test results - F6.
Product
Weight Assay (ppm) Recovery (%)
g % Ta Nb Ta Nb
Ta/Nb cleaner concentrate 82.2 2.1 1,990.0 7,579.0 21.2 12.6
Ta/Nb cleaner tailings 691.1 17.9 733.0 5,129.5 65.6 71.5
Total Ta/Nb rougher concentrate 773.3 20.1 866.6 5,389.9 86.8 84.1
Cleaner carbonate concentrate 628.2 16.3 10.0* 117.0 0.8 39,934.0
Pyrrhotite concentrate 1,132.0 3.4 164.0 823.0 2.8 2.2
Slimes 799.7 20.8 74.0 439.0 7.7 7.1
Flotation tails 1,517.8 39.4 10.0* 167.0 2.0 5.1
Calculated feed 3,851.0 100.0 200.6 1,286.6 100.0 100.0
Measured feed 265.0 1,872.0
* denotes less than detection"
Für mich ist das das endlich ersehnte Update zu den mettalurgischen Tests. Die Recovery mit rund 85% kann sich sehen lassen, zudem wird ja weiterhin optimiert.
Eine neue Präsentation datiert auf April 2010 gibts unter:
www.commerceresources.com/i/pdf/CCEPresentation-Apr20…
Viele Grüße
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