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Storliden
- 1. NN AA NN NN AA NN DISCOVERY OFDISCOVERY OF THE STORLIDEN Cu-Zn VMS DEPOSITTHE STORLIDEN Cu-Zn VMS DEPOSIT A NEW VMS TYPE IN THE SKELLEFTE MINING DISTRICT NORTHERN SWEDEN NORTHATLANTIC NATURALRESOURCES AB Uppsala, Sweden
- 2. NN AA NN A NEWEXPLORATION COMPANY • JANUARY 1997 - FORMATION OF NAN • JUNE 1997 - IPO ON STOCKHOLM EXCHANGE • AUG. 1997 - AIRBORNE GEOPHYSICAL SURVEY • FEB. 1998 - GROUND FOLLOW-UP, DRILLING • MAR. 1998 - STORLIDEN DISCOVERY HOLES • JUNE 1998 - HIGH-GRADE CU-ZN • NOV. 1998 - 1.8 Mt - 10% Zn, 4% Cu
- 3. NN AA NN NAN CORPORATESTRUCTURE • 39% BOLIDEN AB • 39% SOUTH ATLANTIC RESOURCES LTD. • 22% PUBLIC • LISTED ON STOCKHOLM EXCHANGE • 31.2 M SHARES OUTSTANDING
- 4. NN AA NN WHY SWEDEN? • UNDER-EXPLORED PROSPECTIVE GROUND • NEW MINING LEGISLATION - 1993 • WORLD CLASS MINERAL DEPOSITS • EXCELLENT INFRASTRUCTURE • LONG MINING TRADITION - 800 YEARS • STABLE ECONOMIC & POLITICAL CLIMATE • MINING CENTER OF EUROPE
- 5. NN AA NN SWEDEN - WORLDCLASS DEPOSITS • KIRUNA – 2.6 Bt 63% Iron • BOLIDEN – 8 Mt - 15.5 gt Au (4 M oz) • FALUN – 34 Mt - 5% Zn - 0.7% Cu - 2% Pb • ZINKGRUVAN – 29 Mt - 8 % Zn - 4% Pb • LAISVALL – 108 Mt - 4% Pb
- 6. NN AA NN SWEDEN - MINING CENTEROFEUROPE MINE PRODUCTION 1997 PRODUCTION EU EUROPE % EU GOLD (T) 7.3 1 1 34 SILVER (T) 281 1 2 48 COPPER (kT) 81 2 4 44 LEAD (kT) 113 1 1 55 ZINC (kT) 164 2 2 29 IRON Ore (MT) 22 1 1 92
- 7. NN AA NN Geological Provinces - Baltic Shield
- 8. NN AA NN NAN Project Map SWEDEN N 500 F I N L A N D BERGSLAGEN DISTRICT Kilometres Helsinki Svartliden Solberget Project Stockholm 0 B a l t i c S e a Röjnoret Grundfors Skellefteå Högbränna R U S S I A Ahmavuoma Arctic Circle Älgtorp Jugansbo Vikersvik Risliden Hinsen S W E D E N Sjökälla N o r w e g i a n S e a Kaalasluspa Norrliden N O R W A Y Oslo Hällefors Dubblon Storliden NORRBOTTEN DISTRICT Mining District N o r t h S e a NAN Project SKELLEFTE DISTRICT September, 1998 NORRBOTTEN SKELLEFTE BERGSLAGEN
- 9. NN AA NN Piteå Luleå Skellefteå 25 km Rönnskär Smelter 95 Boliden Arvidsjaur 370 Norsjö Sorsele Norrbotten Västerbotten Malå363 Storliden Lycksele E12 The Skellefte District 0 50 SKELLEFTE SMELTER BOLIDEN MILL MALA
- 10. NN AA NN OREDEPOSITS IN THESKELLEFTEFIELD 0 50 N KRISTINEBERG BOLIDEN RENSTROM MALA
- 11. NN AA NN 52 KNOWN VMS DEPOSITS: +100 KT (ALLEN, ET. AL., ECON GEOL, 1996) 10 50 100 Cummulativefrequency% Million Metric Tonnes 30 Volcanic setting Uncertain settingsRhyolite porphyry cryptodome-tuff cone Thin member or rhyolite porphyry cryptodome-tuff cone within other rhyolitic, dacitic or andesitic complexes Dacite-andesite-basalt complex with mineralised rhyolite porphyries Other (and undifferentiated) rhyolite volcanoes Dacite-andesite-basalt complex with no rhyolite porphyries near ore Maurliden E Petiknäs N Svansele S & Mensträsk Kankberg Norrliden & SvanseleLångdal Petiknäs S Boliden Renströ mLångsele Kristineber g Rackejaur 0.1 1.0 100 Mt20105 MEDIAN: 1.1 MT
- 12. NN AA NN The Skellefte District Simplified Geology Malå Revsund granites Early orogenic granitoids Early orogenic gabbro Mafic volcanics Felsic volcanics Metasedimentary rocks KRISTENEBERG MALA BOLIDEN
- 13. NAN in The SKELLEFTEDISTRICT Norsjö Boliden Adak 0 10 20 km N KRISTINEBERG MALA BOLIDEN
- 14. NN AA NN
- 15. NAN in The SKELLEFTEDISTRICT STORLIDENSTORLIDEN Norsjö Malå Kristineberg Boliden Adak 0 10 20 km N KRISTINEBERG BOLIDEN MALA
- 16. NN AA NN OREDEPOSITS IN THESKELLEFTEFIELD 0 50 N KRISTINEBERG BOLIDEN RENSTROM MALA STORLIDEN
- 17. NN AA NN COLORED AIRMAG WITH GEOTEM ANOMALIES 0 2 km N
- 18. NN AA NN GEOTEMAirborne Discovery Profile STORLIDEN ANOMALY Line 1264 Anomaly: A CTP: 61 siemens Depth: 58 metres NC: 12A
- 19. NN AA NN COLORED AIRMAG WITH EM & SCOUT DH
- 20. NN AA NN HLEMProfile with DH1 and DH2
- 22. NN AA NN TEMProfile with Drill Results Interpreted TEM Conductor Low grade lens massive sulphide High grade lens massive sulphide
- 23. NN AA NN TEMSurvey and Scout Drill Holes
- 25. NN AA NN Cross section 20200 E MASSIVE CU-ZN SULPHIDE STRINGER ZONE SEDIMENTS TUFFITES TILL SURFACE
- 26. NN AA NN DEPOSITCHARACTERISTICS DIP : 20º SW STRIKE LENGTH : 400 M WIDTH : 60-80 M DEPTH : 100 - 160 M ORE DENSITY : 3.4 gcc OVERBURDEN : 20-25 M TILL OUTCROP : 1.5 KM SE
- 27. NN AA NN DEPOSITCHARACTERISTICS MINERALIZATION : MASSIVE, COARSE-GRAINED HIGH-GRADE CPY, ZNS W/ PO HOSTROCK : TUFFITES, SEDIMENTS, DIKES ALTERATION : CORDIERITE, ACTINOLITE, CARB. MODE : “STACKED”, STRATIFORM LENSES ZONING : CU RICH - SOUTHERN CU-ZN RICH - CENTRAL ZN RICH - NORTHERN PBS, AU, AS - SOUTH MARGIN GENESIS : SUB-SEAFLOOR REPLACEMENT?
- 28. NN AA NN A NEWVMS DEPOSIT • GRADES : 3X ZN, 4X CU • LOW AU, AG, AS • LOW ANGLE DIP • LACK OF PYRITE • LACK OF DEFORMATION • HIGH STRATIGRAPHIC POSITION? • COARSE GRAINED ORE TEXTURE
- 30. NN AA NN STORLIDEN - CROSS SECTION 20200 E DDH From To Length Cu (%) Zn (%) Ag(ppm) Au(ppm) 98018 145.00 176.60 31.60 3.38 7.95 23.70 0.34 (154.30 165.40 11.10 3.92 21.03 26.50 0.21) 98022 110.00 147.30 37.30 6.03 12.29 26.27 0.22 (110.00 123.20 13.20 5.48 5.17 22.10 0.18) (126.20 147.30 21.10 7.23 18.49 28.67 0.26) 98068 102.40 106.40 4.00 0.84 1.32 39.78 0.27 110.00 111.000 1.00 1.86 2.59 21.10 0.18 118.05 122.05 4.00 2.18 7.00 19.69 0.36 126.50 150.05 23.55 6.40 21.09 25.43 0.30 98020 145.00 151.55 6.55 5.00 24.00 21.20 0.23 A B
- 31. NN AA NN STATEMENTOFRESOURCE 57 Drill Holes RESOURCE TONNES %ZN %CU gt AG gt AU INDICATED 1,500,000 11.5 4.4 28 0.3 INFERRED 300,000 3.4 2.4 33 0.3 _______________________________________________ COMBINED 1,800,000 10.0 4.0 29 0.3 IN-SITU METAL IN TONNES ZINC 182,500 COPPER 73,000
- 32. NN AA NN TYPICALSKELLEFTEVMS DEPOSIT GRADE 3% Zn, 0.7% Cu, 0.4% Pb, 2 gt Au, 50 gt Ag TONNAGE 1.1 Million Tonnes (Median) AGE Early Proterozoic 1.90 - 1.87 Ga HOST Felsic Volcanics near Sedimentary Contact ALTERATION Quartz-Sericite-Pyrite ORE TYPES Sphalerite-Chalcopyrite-Galena with Pyrite-Pyrrhotite-Arsenopyrite-Chlorite ZONING Cu Central, Zn & Pb distal GENESIS Submarine Volcanism
- 33. NN AA NN GEOLOGICALSETTING - MALÅ 23 I
- 34. NN AA NN 52 KNOWN VMS DEPOSITS: +100 KT (ALLEN, ET. AL., ECON GEOL, 1996) 10 50 100 Cummulativefrequency% Million Metric Tonnes 30 Volcanic setting Uncertain settingsRhyolite porphyry cryptodome-tuff cone Thin member or rhyolite porphyry cryptodome-tuff cone within other rhyolitic, dacitic or andesitic complexes Dacite-andesite-basalt complex with mineralised rhyolite porphyries Other (and undifferentiated) rhyolite volcanoes Dacite-andesite-basalt complex with no rhyolite porphyries near ore Maurliden E Petiknäs N Svansele S & Mensträsk Kankberg Norrliden & SvanseleLångdal Petiknäs S Boliden Renströ mLångsele Kristineber g Rackejaur 0.1 1.0 100 Mt20105 MEDIAN: 1.1 MT STORLIDEN
- 35. NN AA NN MOSTVALUABLEDEPOSITS - SKELLEFTEDIST. MINE Mt %Zn %Cu %Pb g/tAu g/tAg $/t GIV MUS$ 1. Kristeneberg 22 3.2 1.2 0.4 1.0 32 73 1600 2. Boliden 8 0.9 1.4 0.3 15.5 50 184 1500 3. Renstrom 9 6.5 0.8 1.5 2.8 155 144 1300 4. Langsele 12 3.9 0.6 0.3 0.9 25 67 800 5. Petiknäs 6 4.8 1.1 0.9 2.3 108 115 750 6. Ravlidmyran 8 3.9 1.0 0.6 0.8 51 79 600 7. Udden 7 4.3 0.4 0.3 0.7 36 68 455 8. Maurliden W. 7 3.4 0.2 0.4 0.9 49 59 407 9. STORLIDEN 2 10.0 4.0 0.1 0.3 30 210 378
- 36. NN AA NN STRATIGRAPHY & ORE DEPOSITS Skellefte Group Volcanics Vargfors Sediments 1890 Ma 1882 Ma 1873 Ma SENW ALLEN, ET. AL. STORLIDEN? LANGSELE LANGDAL MAURLIDEN MENSTRASK HOLMTJARN
- 37. NN AA NN LOCATION MAP 365 m365 m 707 m 250 m 760 m 250 m 985m 385 m 260 m 735 m 365 m Shortest distance North 707 m South 985 m Ramp options
- 38. NN AA NN UNDERGROUNDMINING OPERATION SCHEMATIC CROSS SECTION ORE CU-ZN RAMP PORTAL Drill holes N
- 39. NN AA NN SWEDENS NEWESTMINE 90 KM FROM BOLIDEN MILL 140 KM FROM BOLIDEN SMELTER 2 KM FROM ASPHALT HIGHWAY 3 KM FROM POWERLINE 8 KM FROM TOWN OF MALA TRAINED WORK FORCE YEAR-ROUND ACCESS
- 40. NN AA NN PROJECTTIMETABLE PROJECTNETCASHFLOWWITHDIFFERENTMETALPRICES -25 -15 -5 5 15 25 35 45 55 65 75 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 US$millions ENVIRONMENTAL FEASIBILITY CONSTRUCTION DEVELOPMENT PRODUCTION REHABILITATION
- 41. NN AA NN SKELLEFTEEXPLORATION TARGETS NAN TARGET INVENTORY Skellefte District, Feb. 5, 1999 Production Development Feasibililty Pre-feasibility Reserve Resource Detailed Drilling Definition Drilling Scout Drilling Ground Surveys Target Selection TARGETS
- 42. NN AA NN MAIN OFFICE: UPPSALA FIELDOFFICES: 2 - SKELLETEDISTRICT 30 EMPLOYEES 2,500 KM2 IN SKELLEFTEMINING DISTRICT AIRBORNESURVEY TARGETS AGGRESSIVEDRILLPROGRAM $10 MILLION CASH DISCOVERY OFTHESTORLIDEN CU-ZN DEPOSIT DEVELOPMENTOFNORRLIDEN CU-ZN DEPOSIT NAN TODAY
- 44. NN AA NN STORLIDEN - LN. 20100ECROSS SECTION A B
- 46. NN AA NN STRATIGRAPHY & ORE DEPOSITS Skellefte Group Volcanics Vargfors Sediments 1890 Ma 1882 Ma 1873 Ma SENW ALLEN, ET. AL. LANGSELE LANGDAL MAURLIDEN MENSTRASK HOLMTJARN
Editor's Notes
- The GEOTEMTM survey was flown along survey lines oriented NE-SW and spaced 200 m apart. The survey revealed a number of features worthy of further investigations on the ground. One of these, subsequently named Storliden, is situated in an area of thick glacial overburden. This anomaly (marked with an arrow on ) displays a strong EM response in all 24 channels displayed and the other 96 (not displayed). The body causing the anomaly is interpreted to be 400 m long dipping to the southwest at a depth to top of 110 metres. It has no obvious cultural explanation and was considered likely to reflect either a relatively shallow body of massive sulphide mineralisation or a bedrock unit with a high content of graphite. A coincident positive magnetic response gave the anomaly added significance, implying that sulphides would be the likely cause.
- The Storliden anomaly was assigned a priority rating for ground follow up, to confirm the airborne anomaly and to provide targets for an initial phase of scout diamond drilling. Horizontal loop electromagnetic (HL-EM) profiles verified the airborne pattern and indicated a conductor 400 m long, dipping sub-vertically, at a depth of some 35 metres. This feature was chosen as the first drilling target at Storliden. The first drillhole intersected a steeply dipping mineralised zone with a true width of some 20-25 metres containing predominantly pyrrhotite. The ground magnetic survey over the same grid as the HL-EM revealed an anomaly of 200 nT, with the same general shape as the airborne magnetic anomaly. This anomaly was subsequently found to bear a close relation to the main ore body.
- The Storliden anomaly was assigned a priority rating for ground follow up, to confirm the airborne anomaly and to provide targets for an initial phase of scout diamond drilling. Horizontal loop electromagnetic (HL-EM) profiles verified the airborne pattern and indicated a conductor 400 m long, dipping sub-vertically, at a depth of some 35 metres. This feature was chosen as the first drilling target at Storliden. The first drillhole intersected a steeply dipping mineralised zone with a true width of some 20-25 metres containing predominantly pyrrhotite. The ground magnetic survey over the same grid as the HL-EM revealed an anomaly of 200 nT, with the same general shape as the airborne magnetic anomaly. This anomaly was subsequently found to bear a close relation to the main ore body.
- Following initial recognition of what later became the main ore body, further geophysical surveys of various types were conducted at Storliden. A transient electromagnetic (TEM) survey with a large 700 by 300 metre loop showed a strong response over the main ore body. The interpretation of the TEM response reflects a sub-vertical, tabular conductor linked at depth to a sub-horizontal conductor with a shallow dip to the south. The sub-vertical body can be attributed to a pyrite-pyrrhotite zone of veins and stockworks lying above the sub-horizontal lenses of massive high-grade copper and zinc sulphide zone.
- Following initial recognition of what later became the main ore body, further geophysical surveys of various types were conducted at Storliden. A transient electromagnetic (TEM) survey with a large 700 by 300 metre loop showed a strong response over the main ore body. The interpretation of the TEM response reflects a sub-vertical, tabular conductor linked at depth to a sub-horizontal conductor with a shallow dip to the south. The sub-vertical body can be attributed to a pyrite-pyrrhotite zone of veins and stockworks lying above the sub-horizontal lenses of massive high-grade copper and zinc sulphide zone.
- Storliden is a volcanic hosted massive sulphide (VHMS) zinc-copper deposit, located in the western Skellefteå district, in an area which has no prior history of mining, although the Skellefteå district is one of the most important Proterozoic VHMS mining regions in the world. Storliden consists of several sub-horizontal and partially overlapping lens shaped bodies of massive sulphide mineralisation hosted by Proterozoic volcano-sedimentary rocks (cf ). Ore minerals are sphalerite and chalcopyrite within a gangue that is predominantly pyrrhotite. The mineralised system has an overall strike length of some 400 meters and width of 100 meters. Individual mineralised zones vary in thickness from 0.5 to 28 meters with an average of 8 meters. Bedrock is covered by approximately 20 meters of glacial till. The richest part of the deposit does not sub-outcrop and lies approximately 130 meters below ground surface.
- Storliden is a volcanic hosted massive sulphide (VHMS) zinc-copper deposit, located in the western Skellefteå district, in an area which has no prior history of mining, although the Skellefteå district is one of the most important Proterozoic VHMS mining regions in the world. Storliden consists of several sub-horizontal and partially overlapping lens shaped bodies of massive sulphide mineralisation hosted by Proterozoic volcano-sedimentary rocks (cf ). Ore minerals are sphalerite and chalcopyrite within a gangue that is predominantly pyrrhotite. The mineralised system has an overall strike length of some 400 meters and width of 100 meters. Individual mineralised zones vary in thickness from 0.5 to 28 meters with an average of 8 meters. Bedrock is covered by approximately 20 meters of glacial till. The richest part of the deposit does not sub-outcrop and lies approximately 130 meters below ground surface.