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Duluth Metals Announces SEDAR Filing Of AMEC Technical Report On The Twin Metals Project

Tables of the updated resource tons and grades for various cut-offs are shown below for each deposit. The base case (0.3% Cu cut-off) is highlighted. The remaining cases are included to show the sensitivity of the estimates to changes in cut-off grades:

Table 3 - MATURI DEPOSIT INDICATED AND INFERRED MINERAL RESOURCES (effective date 15 September 2012)

 
                       Maturi Deposit[3]
            Indicated Mineral Resource[4]
    Cu %    Million Cu   Ni   Pt   Pd   Au   TPM[5]
    cut-off Tons    %    %    ppm  ppm  ppm  ppm
    0.2     1137    0.57 0.18 0.15 0.34 0.08 0.58
    0.3     1065    0.59 0.19 0.16 0.36 0.09 0.60
    0.4     936     0.63 0.20 0.17 0.38 0.09 0.64
    0.5     739     0.67 0.21 0.19 0.42 0.10 0.70
    0.6     538     0.72 0.23 0.20 0.45 0.11 0.76
            Inferred Mineral Resource
    Cu %    Million Cu   Ni   Pt   Pd   Au   TPM
    cut-off Tons    %    %    ppm  ppm  ppm  ppm
    0.2     782     0.43 0.14 0.12 0.27 0.06 0.44
    0.3     542     0.51 0.17 0.14 0.32 0.07 0.53
    0.4     383     0.57 0.19 0.16 0.38 0.08 0.62
    0.5     256     0.63 0.20 0.20 0.44 0.10 0.74
    0.6     141     0.70 0.22 0.24 0.53 0.12 0.88
 

Table 4 - BIRCH LAKE DEPOSIT INDICATED AND INFERRED MINERAL RESOURCES (effective date 15 September 2012)

 
                     Birch Lake Deposit
            Indicated Mineral Resource
    Cu %    Million Cu   Ni   Pt   Pd   Au   TPM
    cut-off Tons    %    %    ppm  ppm  ppm  ppm
    0.2     111.9   0.49 0.15 0.22 0.48 0.11 0.80
    0.3     99.7    0.52 0.16 0.23 0.51 0.11 0.86
    0.4     85.4    0.55 0.17 0.25 0.54 0.12 0.91
    0.5     54.9    0.60 0.18 0.27 0.59 0.13 0.99
    0.6     22.8    0.67 0.21 0.29 0.63 0.14 1.06
            Inferred Mineral Resource
    Cu %    Million Cu   Ni   Pt   Pd   Au   TPM
    cut-off Tons    %    %    ppm  ppm  ppm  ppm
    0.2     313.1   0.41 0.13 0.16 0.32 0.08 0.55
    0.3     239.2   0.46 0.15 0.18 0.37 0.09 0.64
    0.4     158.4   0.51 0.16 0.20 0.42 0.10 0.72
    0.5     76.8    0.58 0.18 0.23 0.48 0.11 0.82
    0.6     23.5    0.66 0.20 0.27 0.57 0.13 0.97
 

Table 5 - SPRUCE ROAD DEPOSIT INFERRED MINERAL RESOURCE (effective date 15 September 2012)

 
            Spruce Road Deposit
            Inferred Mineral Resource
    Cu %    Million   Cu        Ni
    cut-off Tons      %         %
    0.2     674       0.38      0.14
    0.3     480       0.43      0.16
    0.4     254       0.50      0.18
    0.5     101       0.57      0.21
    0.6     24        0.66      0.24
 

_________________________________ [ 3 ] Maturi Deposit tonnages do not include 139 million tons of mineralized material excluded from the underground resource in a safety pillar. [ 4 ] CIM Definition Standards (2010) were followed for Mineral Resource estimation and classification. [ 5 ] TPM is defined as Au + Pt + Pd.

Exploration Target Area Tonnage and Grade Ranges

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