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Meråker Geology

The Meråker property is aligned in such a way as to cover two separate mineralized trends: one within the Kjølhaug Group and a second within the Fondsjø Group. As such, the majority of property is underlain by the two groups, along with the intervening Sulåmo Group.

The overall dip of stratigraphy is towards the west-northwest; thus the eastern and southern portions of the property are structurally lowest, and are underlain by sandstone, slate, conglomerate and greywacke of the Kjølhaug Group. Sedimentary layering is visible and generally banded on a cm to dm scale, with alternating greywacke and schist bands common throughout the area. Carbonate cement is present but rare in the greywacke units. Extensive gabbro sills are also present, generally with a strike parallel to host stratigraphy. The contact of this unit with the structurally overlying Sulåmo Group is interpreted to be tectonic. The Gilså, Lillefjell, and Anna-Ebba-Duddu showings are located within this horizon, at roughly the same stratigraphic level ~ 1 km east of the contact with the overlying Sulåmo Group.

The southwestern and central parts of the property are underlain by the Sulåmo Group, dominated by slate, sandstone, mica schist and conglomerate with minor basalt. Recorded mineralization is much sparser within this group, with only a handful of historical showings. The only significant results from modern sampling within this group are from showings in a basaltic horizon near the contact with the Kjølhaug Group. This horizon has been termed the Turifoss Greenstone by previous workers, and can be traced for 20 km of strike length (8 km of which lie within the property) with a thickness of ~1 km. It is this unit which is in tectonic contact with the Kjølhaug Group. The western edge of the Sulåmo Group is defined by a 10 m thick conglomerate unit, interpreted be a basal conglomerate and taken as evidence for the overturned nature of the stratigraphy in the area.

The northwestern portion of the property is underlain by the Fondsjø Group, composed of basalt, co-magmatic dykes and gabbro (simply termed “greenstone” in much of the historic mapping) intruded by tonalitic rocks. Structurally overlying this sequence is a series of felsic volcanic rocks, which are in turn overlain by tuffaceous sediments with interlayered pillow basalt and felsic pyroclastic rocks. A string of historic showings is present at the same stratigraphic level as the felsic volcanic rocks, with the most significant being Mannfjell and Fonnfjell.

Significant Showings

Lillefjell

The Lillefjell showing is the most historically significant on the property, with historical records indicating that mining was active for nearly 200 years (1750 – 1920) and that ~120,000 tonnes of copper-rich ore was extracted from an underground operation. It is likely that this copper-rich ore was accompanied by significant zinc, though that commodity was of little economic interest at the time and was likely either left in place or discarded as waste during mining operations. The showing is above tree-line, and numerous footings from historic mine buildings still remain onsite. One sample recorded by the NGU from this site returned 9.9% Cu, 4.6% Zn, 1.5% Pb, 34 g/t Ag and 2.5 g/t Au. The gold value associated with this sample is especially interesting, as it is unusually high for a massive sulphide deposit of this type. A second sample from this site returned lower (but still anomalous) metal values of 1.8 % Cu, 2.6% Zn, 550 ppm Pb, 6.5 ppm Ag and 0.03 ppm Au.

NGU    Sample #   Sample Type Cu     ppm Zn         pm Pb     ppm Co ppm Ni ppm Ag ppm Au ppb
HK90-038 Bedrock 37244 8412 573 56 14 12.8 20
HK90-040 Bedrock 13499 42100 887 111 8 9.8 217
HK90-041 Bedrock 80081 33572 1520 355 8 29 193
HK90-042 Bedrock 12936 44459 732 153 14 5.8 101
HK90-043 Bedrock 52445 46429 1072 165 8 20.2 233
HK90-044 Bedrock 99043 12341 505 75 12 34.4 2542
HK90-046S Bedrock 36137 23698 733 158 12 13.6 120
HK90-048 Bedrock 44169 19478 487 71 19 15 134

 

Mannfjell

The Mannfjell showing is the source of the largest recorded production from the Fondsjø Group, with ~100,000 tonnes reported as being extracted. Dates of mining are not recorded, but likely pre-date the 20th century and certainly pre-date modern mining methods. The NGU database contains four rock samples from this area, with assays values ranging from 0.3% Cu, 0.5% Zn, 20 ppm Ag and 0.24 ppm Au to as much as 6.6% Cu, >10% Zn, 157 g/t Ag and 3.75 g/t Au. As with the Lillefjell showing, these gold and zinc values are significant as historic production would have been focussed exclusively on copper.

NGU Sample #   Sample Type Cu     ppm Zn         pm Pb     ppm Co ppm Ni ppm Ag ppm Au ppb
TG93.008 Bedrock 3164 10930 88 7 5 157.2 3745
TG93.058 Dump 6610 99999 1227 26 5 18.5 380
TG93.059 Dump 6479 19218 842 16 3 11.7 292
TG93.060 Dump 15182 99999 116 14 3 14.6 215
TG93.061 Dump 17408 24009 65 13 4 20.3 323
TG93.063 Dump 33425 16024 300 2 4 66.3 1083
TG93.064 Dump 16468 97892 76 38 3 35.4 714
TR-1-3 Dump 3619 82819 425 20 17 26.8 2657
TR-1-4 Dump 10156 83273 1674 12 8 25.8 482
TR-1-5 Dump 15689 1742 47 11 10 10.6 133

 

Fonnfjell

Sampling from the Fonnfjell showing, together with the nearby Løvlibekk and Øytrø showings outline a mineralized area with a footprint of ~ 1000 m x 500 m within the Fondsjø Group. The best sample taken from the area recorded by the NGU is from the Øytrø showing, with >10% Zn, 1.7% Cu, 3.9% Cu, 117 g/t Ag and 2.1 g/t Au. The Fonnfjell showing was historically mined via shallow adit, with a sphalerite-rich waste dump in front of the adit entrance. It is unknown if there was historic exploitation of the other two showings.

NGU Sample #  Sample Type Cu     ppm Zn         pm Pb     ppm Co ppm Ni ppm Ag ppm Au ppb
TG93.036 Bedrock 9826 99999 3695 13 3 89.5 1868
TG93.040 Bedrock 17437 96579 25 15 7 27.2 203
TG93.041 Bedrock 3441 99999 593 6 2 37.6 1901
TG93.042 Bedrock 10489 99999 3057 16 2 59.1 954
TG93.043 Bedrock 15319 94564 3237 11 1 117 2135
TR-7-29 Bedrock 11719 89532 3943 11 5 98 1591
TR-7-30 Bedrock 497 37521 2253 15 33 18.5 503
TR-7-31 Bedrock 317 64610 309 6 9 40.3 1321

 

Anna-Ebba-Duddu

This series of showings occurs along the contact with a large gabbro sill in the Kjølhaug Group. Sampling from the NGU database shows Cu and Zn values in excess of several percent over a strike length of 1.8 km; the single best sample is from the Duddu showing, with 5% Cu, 9.7% Zn, 0.27% Pb, 41 g/t Ag and 0.6 g/t Au note that this trend aligns with what they interpret to be a buried conductor detected by the NGU airborne geophysics and recommend that additional work be conducted on this target.

NGU Sample # Showing  Sample Type Cu     ppm Zn         pm Pb     ppm Co ppm Ni ppm Ag ppm Au ppb
HK90-059 Anna Bedrock 19691 66907 1428 104 19 13 114
HK90-060 Anna Bedrock 9141 68829 1644 87 16 11.3 57
HK90-061S Anna Bedrock 37217 49577 653 82 22 12.8 55
HK90-062 Anna Bedrock 44162 4754 23 36 17 6.1 80
HK90-063 Anna Bedrock 31020 3299 5 61 35 4.8 452
HK90-052 Dubba Bedrock 4987 97516 2710 108 31 16.1 65
HK90-053 Dubba Bedrock 28382 59230 1202 244 30 27.3 615
HK90-054 Dubba Bedrock 16776 82295 1939 203 27 17.7 177
HK90-055 Dubba Bedrock 50217 22191 680 167 79 41.5 468
HK90-058S Dubba Bedrock 31954 51632 1117 168 40 25 338
HK90-065 Ebba Bedrock 94298 3850 16 305 21 13.3 17
HK90-068S Ebba Bedrock 54437 2720 2 318 21 7.7 28

 

Reference: 2019 Technical Report on the Meråker Project by David Swanton, M.Sc., P.Geo. dated Feb 27, 2019

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