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Bleikvassli Exploration and Mining History

The area now covered by the Bleikvassli exploration licenses has an extensive history of exploration and mining, operating as the Bleikvassli Gruven from the years 1957-1997, producing a total of 5.0 Mt grading an average of 4% Zn, 2% Pb, 0.15% Cu and 25 g/t Ag (Geological Survey of Norway, 2017). As part of the mining operation, over 1,000 drillholes were completed and underground workings were excavated over nearly a kilometre strike length and to several hundred meters depth. There remain onsite at the Bleikvassli mine facility numerous paper records of drill sections, level and plans and production records that have not been digitized or evaluated by modern methods. In addition to the paper records retained at the mine site, several drillholes from the mining operation are currently housed and available for review at the NGU’s National Drill Core and Sample Centre in the town of Løkken.

NGU Drillcore Storage Facility
NGU Drillcore Storage Facility
NGU Drillcore Storage Facility
NGU Drillcore Storage Facility
NGU Drillcore Storage Facility
NGU Drillcore Storage Facility

NGU Drillcore Storage Facility

Examples of some of the NGU’s selected grab(?) samples of drill core currently stored in the Løkken Core library (sample widths or depth are unknown):

NGU Sample #  Sample Type Cu     ppm Zn         pm Pb     ppm Co ppm Ni ppm Ag ppm Au ppb
DH10-96 Core 3114 56525 33260 26 15 100 311
DH24-91 Core 1318 88814 34108 39 78 134 50
DH24-96 Core 5510 49686 25930 96 33 110 740
DH2-90A Core 3183 33501 4644 1 8 50 3
DH2-90B Core 6392 15301 7561 1 12 144 7
DH2-90C Core 1865 58930 28954 33 31 59 26
DH29-96 Core 5065 25617 23336 112 90 425 185
DH3-93 Core 603 19215 41354 3 305 178 298
DH5-90 Core 904 52100 10214 25 7 41 37
DH6-94 Core 2334 18117 18471 3 60 178 45

 

There are no summary datasets were available for review however, results of the in-mine drilling and exploration were sufficiently successful to keep the mine in operation for 40 years. Summary statements of historical records suggest there was an economically significant quantity mineralized material remaining within the mine at the time of closure (due to flooding) in 1997; historical records state that the area originally to contained 6.5 Mt of mineralized material  of which only 5.0 Mt was mined, suggesting that 1.5 Mt could potentially remain un-mined. However, previous workers did not outline their key assumptions, parameters and methods of resource estimation and did not specify resource categories for this estimate and as such are not compliant with NI 43-101 standards. These historical estimates have been provided for context only and Norra is not treating these resources as current resources.

Upon closure of the mine in 1997, the owners at the time transitioned their company from a mining operation to a mining and earthworks contractor. Mineral extraction rights to the mine itself were apparently allowed to lapse following closure; the current exploration rights were registered by EMX Royalty Corp in 2018 and are now subject to a definitive agreement whereby ownership of the licences will be transferred to Norra Metals.

Prior to closure of the mine, a series of exploration programs were undertaken by the NGU in the Bleikvassli region, with the aim of finding additional mineralization for the mine. A series of stream sediment surveys took place in 1965, 1969, 1970, 1981 and 1982 over a large (several hundred square kilometre) area which includes the Bleikvassli mine.. Additional soil and stream sediment surveys were carried out in 1985 and 1986, both of which were large-scale with sampling density of 1 sample/10 km2 and 1 sample/40 km2, respectively. Data from these surveys shows anomalous lead and zinc values from both the immediate vicinity of the Bleikvassli mine and an area several kilometres southeast of the mine. The area is not given a name as part of the work during 1985 & 1986, but corresponds to what was termed the Brunesbekken showing by later workers.

During the 1993 season, a large-scale C-horizon soil sampling program was undertaken, with samples taken at 1 km grid spacing over an 40 km x 35  km area, extending east from the Bleikvassli mine area towards the Swedish border. This program outlined several anomalies in the immediate vicinity of the Bleikvassli mine which were followed up during the 1995 field season with several smaller scale surveys. Only one of these surveys  was conducted over an area now encompassed by the Bleikvassli property (the area was termed Hallvarddalen) and roughly corresponds to the area now covered by the northern portion of the Bleikvassli 3 and Bleikvassli 4 tenures). Sampling in this area returned several significant Pb-Zn-Cu soil anomalies, and additional work was recommended at the time.

In addition to these soil anomalies, mineralization has been recorded in drilling at the Brunesbekken area, approximately 1.5 km south of the Bleikvassli mine. Two exploration holes were drilled in this area in 1987, with additional ground-based EM surveying in 1995 and six more drillholes in 1997. Results of the EM survey showed a conductive zone at depth, which provided the basis for the follow-up drilling in 1997. Drilling intercepted a zone of weak mineralization.

Finally, the NGU rock sample database contains a set of samples from the southeastern end of the property in an area known as Kongsfjellet, many of which returned Zn and Pb values in excess of several percent. Though there is no mention of specific sampling dates or methodology, quality of the NGU’s geochemical and spatial data is considered good, and these samples are a reliable basis for follow up work in the area.

NGU Sample #  Sample Type Cu     ppm Zn         pm Pb     ppm Co ppm Ni ppm Ag ppm Au ppb
NO0717.02 Bedrock 39290 152 95 75 28 5.3 37
NO0717.05 Bedrock 15957 382 41 54 35 2.9 12
NO0717.07 Bedrock 14901 806 142 185 114 1.6 15
NO0717.08 Bedrock 12066 5263 347 190 117 2.4 23
NO0717.10 Bedrock 9946 2328 159 188 111 1.4 7
NO0717.13 Bedrock 329 17345 8913 18 46 11.4 24
NO0717.14 Bedrock 4752 47693 14281 44 71 32.8 40
NO0717.15 Bedrock 10732 9641 5859 9 13 12.2 21
NO0717.16 Bedrock 842 99999 17794 110 183 80.6 11
NO0717.17 Bedrock 12524 35508 15009 18 16 45 744
NO0796.01 Bedrock 11748 44730 11517 46 87 34 114
NO0796.03 Bedrock 2908 8039 3894 15 25 8.1 12
NO0797.01 Bedrock 3811 22187 7981 12 15 8.7 16
NO0798.01 Bedrock 17380 2099 13223 17 18 74 58
NO0798.03 Bedrock 17796 499 59 40 46 3.8 21

 

Reference: 2021 Technical Report on the Bleikvassli Project by David Swanton, M.Sc., P.Geo. dated January 27, 2021

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