Extensive exploration and development work was conducted by Dominion Gulf Company ("Gulf") in the late 1950s and 1960s, including ~35,000 feet of diamond drilling, and expenditures of ~$1,000,000 in metallurgical testing in conjunction with the Colorado School of Mines Research Foundation. In addition an adit was driven 580 feet into the main ore body, and Gulf calculated the reserves in the main D Zone to be 20,000,000 tons of 0.47% Nb2O5 in an area of 600 feet by 800 feet and to a depth of 600 feet*.
The current drilling program has been designed to test this historically reported niobium inferred resource, which has been subsequently written up in numerous Ontario Geological Survey reports.
"The historical work done to date is detailed and of high quality. The
modeof emplacement is well understood and the potentially economic D Zone has
been well outlined. The detailed work of the OGS in the 1970's and 80's has
largely confirmed the interpretations and the historical exploration work of
Parsons
and the Dominion Gulf Company."
"The D Zone historical reserve estimate of 20,000,000 tonnes grading 0.47%
Nb2O5 is within the range currently considered economic in
carbonatite-alkalic rock complex literature for commercial production. Tantalum
and
REE are commonly associated with these niobium occurrences. Therefore the
economic
potential of the Nemegosenda complex could be substantially greater than
what has historically been inferred by the presence of tantalum, REE, and
uranium. Also, the East Zone area has good potential to substantially increase
the overall reserves of the Sarissa property as described earlier."
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