Norden Crown Metals Corp. has begun diamond drilling at the past-producing Fredriksson mine, which is located on the Gumsberg property in the Bergslagan mineral province of southern Sweden. Silver-lead-zinc sulphide mineralization at Fredriksson is associated with ghanite in garnet-rich metamorphic rocks, and is interpreted to belong to the Broken Hill type (BHT) mineral deposit clan, named after the Broken Hill deposit, the largest accumulation of Pb, Zn and Ag on Earth.
“Fredriksson … is a very exciting shallow exploration drilling target,” stated Patricio Varas, Norden Crown’s chief executive officer. “Broken Hill type deposits constitute some of the world’s largest ore deposits and the identification of this style of mineralization on the Gumsberg licences considerably increases the potential for a drill discovery.”
Historical data at Fredriksson demonstrates silver-lead-zinc mineralized zones form a moderately east-plunging fold geometry that is open in all directions. Test mining from an open pit where these zones reach the surface produced 21,000 tonnes grading 53 grams per tonne silver, 5.13 per cent zinc and 1.7 per cent lead. Subsequent underground mining production down to 91 metres produced and additional 45,000 tonnes grading 49 g/t silver, 5.77 per cent zinc and 1.84 per cent lead.
Fredriksson diamond drilling
Initial diamond drilling at Fredriksson consists of a four-hole, approximately 700-metre test below the historical workings where a recent 3-D geological modelling initiative, including surface and subsurface lithology, structure and assay data, demonstrates that silver-zinc-lead mineralization extends to approximately 400 m depth. Mining at Fredriksson removed ore from a surface pit and from underground levels to approximately 120 m down dip (75 vertical m from surface) and demonstrates that mineralization ranges between three and 10 m in thickness. The goal of the initial drilling at Fredriksson is to confirm the silver-zinc-lead grades, and to test the vertical and lateral continuity of mineralization.
Norden Crown’s 3-D modelling utilizes drill results that are historical in nature. Norden Crown has not undertaken any independent investigation of the sampling and has not independently analyzed the results of the historical exploration work to verify the results. Norden Crown considers these historical drill results relevant as the company will use these data as a guide to plan future exploration programs. The company also considers the data to be reliable for these purposes; however, the company’s future exploration work will include verification of the data through drilling.