Tulks South

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Introduction:

Newfoundland

The 100%-owned Tulks South property is located in central Newfoundland, approximately 120 kilometres southwest of Grand Falls-Windsor (pop. 15,000) and 50 kilometres southwest of Buchans (pop. 600). The property hosts two significant Cu-Pb-Zn-Ag-Au volcanogenic massive sulphide (VMS) deposits, the Boomerang-Domino Deposit and Tulks East Deposit.   Numerous VMS prospects and occurrences remain underexplored on the property.

The property area is accessible by well-maintained logging/mining roads originating from the paved highway at Buchans or Millertown.  Secondary logging roads and logging trails provide good access to various parts of the property, including truck access to the Boomerang-Domino and Tulks East deposit. The property is located approximately 65 kilometres southwest of Teck Resources Ltd’s recently closed (June 2015) Duck Pond Cu-Zn mine.

Property Highlights:

  • Large land package covering 17,635 hectares (176.3 square kilometres)
  • Excellent road access and nearby infrastructure (power, workforce, services).
  • Significant zinc-lead-copper-silver-gold volcanogenic massive sulphide (VMS) deposits discovered on the property including the Boomerang-Domino Deposit, the adjacent Hurricane Prospect, and the Tulks East Deposit.
  • Numerous, underexplored base metal occurrences located along strike of the deposit areas including Cu-rich prospects (Tulks West, Hilltop) and Zn-rich prospects (Zinc Zone, Touchdown, End Zone, Middle Tulks).
  • The Curve Pond and Dragon Pond prospects are associated with "iron formation", a hallmark of large massive sulphide deposits in New Brunswick (Bathurst Camp).  Each of these horizons has a 10 to 20 km strike length along the east and west margins of the Tulks Hill Volcanic Belt.  
  • Two gold prospects, the Midas Pond and Eagle have returned significant gold values including 14.7 g/t gold over 1.15 metres and 10 to 60 g/t gold from grab samples (Eagle).

Property Resources:

Deposit  Category  Tonnes Zinc (%) Lead (%) Copper (%) Silver (g/t) Gold (g/t) Cut-off
Boomerang Indicated 1,364,600 7.07 3.00 0.51 110.2 1.66 1% Zn
Inferred 278,100 6.72 2.88 0.44 96.5 1.29 1% Zn
Domino Inferred 411,200 6.30 2.80 0.40 94.0 0.60 1% Zn

Ownership:

Canadian Zinc Corporation owns a 100% interest in the Tulks South property, subject to a 2% Net Smelter Royalty (“NSR”) held by Glencore-Xstrata (formerly Noranda), a 0.5% NSR to Tulks Resources, and a 2% NSR to Windarra Minerals with a buy-out provision in favour of Canadian Zinc for the whole NSR for $2,000,000 at any time. 

Exploration History:

Darrell corelogging 2005In the late 1960’s, Asarco completed initial exploration work on the property area which resulted in the discovery of the Tulks Hill deposit.  Asarco defined a number of good base metal-type anomalies in the Boomerang Alteration Zone and completed 6 short drillholes into the zone.  Abitibi-Price Mineral Resources explored the property between 1976 and 1984 and discovered the Tulks East deposit in 1977.  Abitibi completed 50 drillholes at Tulks East and 5 drillholes in the “Boomerang Alteration Zone” area.  Abitibi sold the property in 1985 to BP Resources Canada who focused a majority of their efforts on the Tulks Hill VMS Deposit. 

Noranda (now Glencore-Xstrata) acquired the property from BP Resources in 1993 and spent approximately $1.5 million tracing the sulphide rich horizons and evaluating known mineralized zones between 1993 and 1997. In 2003, Messina Minerals acquired the property and discovered the Boomerang-Domino deposit located within the Boomerang Alteration Zone. Messina completed an initial NI43-101 resource calculation on the Boomerang-Domino deposit in 2007.  

Canadian Zinc acquired Messina Minerals in December 2013.

Property Geology:

The Tulks South property is underlain by rocks of the Tulks Hill Volcanic Assemblage of the Victoria Lake Supergroup. The Victoria Lake Supergroup consists of a structurally complex, bimodal Neoproterozoic to Ordovician arc-related magmatic and sedimentary rocks.  The Victoria Lake Supergroup is bounded by the Red Indian Line to the northwest and the Victoria Lake Shear Zone to the southeast.  The contacts between the different assemblages are high-strain zones and are generally interpreted to be thrust faults.

IMG 0976 thumbThe Tulks Hill Volcanic Assemblage is an extensive northeast trending belt of felsic and mafic pyroclastic rocks and flows, mafic dykes, intercalated sediments, and sub-volcanic intrusions metamorphosed to greenschist facies. Prospective felsic volcanic rocks extend the 60 kilometre length of the volcanic belt and contain extensive zones of volcanogenic alteration associated with massive sulphide formation.  The southeast margin is defined by the magnetic anomaly fault zone in contact with the Long Lake Belt volcanic rocks and the northwest side is overlain by sedimentary and volcaniclastic rocks of the Harbour Round belt. 

The rocks within the Tulks South Property area have undergone moderate to strong penetrative deformation and primary textures are frequently obscured or entirely obliterated by a well developed, bedding parallel foliation. The strata are generally steeply dipping and northwest-facing. Small scale isoclinal folds with sub-vertical plunges are common but evidence of large scale folding is sparse.  Two phases of foliation are mapped; many of the sulphide zones within the belt plunge to the northeast so structural modification of the massive sulphides have occurred.  Later ductile (brittle?) shear zones also transect the property trending near the orientation of the dominant foliation. These shear zones enclose large areas of argillic alteration (sericite and pyrite +/- silica, carbonate, etc.) which are locally gold-bearing.  Younger, high-angle faulting is interpreted to offset structural-stratigraphic units by up to 500 metres in places.  

Boomerang-Domino Deposit:

20061013 0601-1A total of 231 drillholes (71,032 metres) have been completed at the Boomerang-Domino Deposit. The Boomerang Alteration Zone, which hosts the Boomerang-Domino deposit, is defined over a strike length of 6,500 metres and widths of 200 to over 500 metres.  The east-northeast striking Baxter’s Pond Fault cuts through the Boomerang Alteration Zone and appears to have cut off and displaced the Boomerang - Domino VMS deposits at the northeast end by up to 1,700 m to the southwest.  Three domains are recognized in the Boomerang-Domino Deposit area and can be grouped as hangingwall, mineralized horizon, and footwall domains. 

The Boomerang deposit is located between 65 to 395 metres below surface. The deposit exceeds 400 m along strike and ranges between 5 m and 20 m thick. The deposit dips approximately 85° to the northwest and plunges from 0° to 15° to the southwest. Two styles of mineralization have been recognized at Boomerang, consisting of massive sulphides and stockwork mineralization.

  1. Massive sulphide mineralization comprises fine to medium grained sphalerite-galena-chalcopyrite-pyrite with pyrite becoming more prevalent towards the margins of the massive sulphide lens. Two phases of sphalerite are recognized: reddish sphalerite and pale yellow to light brown sphalerite that correlates with the highest grade zinc intersections. Arsenopyrite and another, unidentified silvery metallic mineral is associated with the highest grade gold and silver sub-intervals within the massive  sulphide; this mineral could be the precious metal rich mineral series of tetrahedrite-tennantite which may explain the high arsenic and tin and anomalous mercury values in drillhole samples. 
  2. Stockwork mineralization occurs stratigraphically below the main massive sulphide lens but also lateral to and above it, thus enveloping the core of the deposit. The immediate hangingwall stockwork, gradational contacts, and replacement textures such as veining, sulphide porphyroblasts, and relict quartz phenocrysts, are interpreted to support a shallow sub-seafloor replacement model for the deposition of the sulphides.

The Domino deposit is approximately 200 metres northeast of and 100 metres deeper than the Boomerang deposit. The Domino deposit is approximately 300 m long, has a height of between 25 m and 50 m, and ranges from 1 m to 15 m thick, averaging 11 m thick. The deposit remains open along strike to the east and west but it may join into the lower-most section of the Boomerang deposit 200 metres to the west. Massive sulphide mineralization and a 20 metre thick pyritic stringer zone have been intersected in drilling.

Thirty drillholes, totalling 10,418 metres have been completed at the Hurricane Prospect.  The Hurricane Prospect is located 500 metres northeast of and along strike with the Boomerang deposit. Mineralization is hosted within sericitised and mineralized felsic tuffs and reworked sedimentary rocks, similar to those hosting mineralization at the Boomerang deposit, and is likely within the same stratigraphic horizon

Tulks East Deposit:

The Tulks East VMS prospect is located in the Centre of the Tulks Volcanic Belt and represents the largest accumulation of massive sulphide in the belt to date.  The Tulks East prospect occurs about 6 km northeast of the Tulks Hill deposit, within Reid Lot 228 on the northern part of the Tulks South Property. A total of 128 drillholes (23,973 metres) have been completed on the Tulks East prospect. No NI 43-101 compliant resource has yet been completed.

The Tulks East prospect mineralization consists of three separate but adjacent and stratiform zones of pyritic mineralization.  The lenses are tabular to lensoidal in shape and occur at the top of an altered felsic volcanic sequence. Alteration around the VMS zones consists of pyrite, sericite, and silica with insignificant amounts of chlorite; this alteration zone exceeds 1,600 m along strike, over 200 m across strike and has been drilled to depths over 400 m deep where potential exists for additional mineralization.

Three lenses, termed the A, B, and C Zones, have been partly outlined by geophysics and drilling; all remain open at depth. They are possibly within the same stratigraphic horizon as the Boomerang- Domino VMS deposits.  The three sulphide lenses consist of massive to banded, mostly fine to coarse grained, granular pyrite with much lesser and varying amounts of sphalerite, galena, and chalcopyrite in a mixed gangue of quartz, chlorite, calcite, dolomite, and barite.  Arsenic is enriched in the C Zone.

Massive sulphides have been historically identified in two adjacent and parallel, 50° plunging zones (A Zone and B Zone) drilled to a vertical depth of approximately 250 metres. The lenses are tabular to lensoidal in shape, strike east-northeast and dip about 70° northwest, plunge about 45° to the northeast and have an overall length to width ratio of about four to one.

  1. The A Zone grades laterally from a barren pyritic core near surface and gradually increases in base metal grades with depth from an average of approximately 2% to over 5% base metals near 200 m to 250 m below surface.  The A Zone lens is up to 30 m thick and has been drilled to around 250 m vertical depth where the base metal grades have significantly increased and the deposit is still currently open along strike and down plunge.
  2. The B Zone is a base metal rich zone located about 15 m stratigraphically above the A Zone within and at the contact of altered felsic volcanic rocks and overlying graphitic sediments. The deposit has been drill traced for over 180 m along strike and for over 250 m down plunge and remains open past a vertical depth of 200 m below surface.   Abitibi interpreted that the B Zone massive sulphide lens was truncated by faulting at around 100 m depth and did not exist below this level. Drilling by Tulks Resources in 1999 established that the fault truncating the B Zone at around 100 m depth migrates out of section at around 250 m depth and that the B Zone stratigraphy exists untested below this depth.
  3. The C Zone occurs about 250 m along strike to the northeast of the A Zone, in the same stratigraphic horizon. Structural mapping by Messina suggests that the C Zone is the folded continuation of the composite A Zone and B Zone sulphide lenses 

Maps and Sections:

Regional location
Tulks South Property Location Map
(pdf)
 
Boomerang grid plan website
Boomerang-Domino/Baxter Pond Geology Map
(pdf)
Section3250E websitev3
Section 3250E
(pdf)
Section3300E website
Section 3300E
(pdf)
Section3325E website
Section 3325E
(pdf)

Boomerang-Domino-Hurricane Long Section
(pdf)