Hunting Broken Hill Type Deposit In Sweden
Norden Crown Metals Corp. (TSXV: NOCR) has begun diamond drilling at the past producing Fredriksson Gruva (Fredriksson Mine) which is located on the Gumsberg Property in the Bergslagan Mineral Provice of southern Sweden.
Silver-lead-zinc sulphide mineralisation at Fredriksson Gruva 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 Australia’s Broken Hill deposit, the largest accumulation of Pb, Zn and Ag on Earth.
“Fredriksson Gruva is a very exciting shallow exploration drilling target” CEO Patricio Varas said.
“Broken Hill-Type deposits constitute some of the world’s largest ore deposits and the identification of this style of mineralisation on the Gumsberg Licenses considerably increases the potential for a drill discovery.”
Historical data at Fredriksson Gruva demonstrates silver-lead-zinc mineralised 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 g/t silver, 5.13% zinc, and 1.7% lead. Subsequent underground mining production down to 91 meters produced and additional 45,000 tonnes grading 49 g/t silver, 5.77% zinc, 1.84% lead1.
Initial diamond drilling at Fredriksson Gruva consists of a four-hole, ~700m test below the historical workings where a recent 3D geological modelling initiative including surface and subsurface lithology, structure and assay data demonstrates that silver-zinc-lead mineralization extends to approximately 400m depth.
Mining at Fredriksson Gruva removed ore from a surface pit and from underground levels to approximately 120m down-dip (75 vertical meters from surface) and demonstrates that mineralization ranges between three and 10m in thickness. The goal of the initial drilling at Fredriksson Gruva is to confirm the silver-zinc-lead grades and to test the vertical and lateral continuity of mineralisation.
Norden Crown’s 3D modeling utilises drill results that are historical in nature. Norden Crown has not undertaken any independent investigation of the sampling nor has it independently analysed the results of the historical exploration work to verify the results.
Norden Crown considers these historical drill results relevant as the company will use this data as a guide to plan future exploration programmes. 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.
