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NTGO Library and Archives
Box 1500, 4601-B 52nd Ave
Yellowknife NT X1A 2R3
Phone: 867-669-2636
Email: ntgo@gov.nt.ca
Minimum Commodity Grades for NORMIN Showings
For a Showing to be included in NORMIN, at least one commodity must have been detected in an amount above the minimum listed below, either in bedrock or (in the case of placers, for example) in the material which would constitute the ore if the deposit were minable. If a showing is defined for one commodity, another commodity may be listed as anomalous if it has been detected in an amount above or equal to a second assigned value, its 'As a By-Product' minimum.
Minimum Commodity Grades for NORMIN Showings
Commodity
Minimum Grade
Min. Grade (alt. units)
As a By-Product
Ag (Silver)
20 g/t
0.58 oz/T
10 g/t
Antimony - see Sb
-
-
-
Au (Gold)
0.5 g/t
0.015 oz/T
0.5 g/t
Barium, Barium Minerals
8 % BaSO4 or 5 % Ba
-
-
Be (Beryllium)
0.2 % BeO
-
-
Bi (Bismuth)
0.1 %
1000 ppm
-
Boron Minerals
1 % B2O3 or 0.3 % B
10 000 ppm B2O3
-
Boron Compounds in Brine
0.2 % B2O3
2000 ppm
-
Cd (Cadmium)
-
-
0.1 %
Carving Stone
present in some quantity
-
-
Co (Cobalt)
0.05 to 0.10 %
500 - 1000 ppm
-
Coal
present
-
-
Chromium
2% Cr2O3
-
-
Cu (Copper)
0.2 %
2000 ppm
-
Diamond
present
-
-
Fe (Iron)
20 % in iron oxides
-
-
Li (Lithium)
0.2 % LiO2
-
-
Mineral Specimen
present
-
-
Mo (Molybdenum)
0.05 %
500 ppm
-
MoS2 (molybdenite)
0.10 %
-
-
Nb (Niobium)
0.1 % Nb or 0.16 % NbO2
1000 ppm Nb or 1640 ppm NbO2
-
Ni (Nickel)
0.2 %
2000 ppm
-
Pb (Lead)
0.4 %
4000 ppm
-
Pd (Palladium)
0.3 g/t
0.009 oz/T; 300 ppb
0.1 g/t
PGE (Platinum Group Elements; includes Pt Pd Os Ir Rh Ru)