HIGHLIGHTS
The probable location of the sulphide-gold feeder zone for the Nagambie Mine is becoming clearer with the drilling of the NWD001 and RAD004 diamond holes. The feeder zone is now considered to be immediately to the west of the West Pit and it is anticipated that the results for a just-completed RAD004 Radial-DTH IP (Radial-Down-the-Hole Induced Polarisation) survey will support this view.
Mawson Gold have now drilled 15 diamond holes (MDDRE001-015) for 2,775m at the Redcastle JV Property and first results are expected shortly. This drilling at Redcastle was completed immediately prior to Christmas 2020 and the drill rig has now moved to the Doctors Gully prospect in the Whroo JV Property.
Nagambie Resources has established that an Australian laboratory is well equipped to carry out the bacterial speciation and ongoing testwork required to investigate the recovery of residual gold from the 1989-1997 Nagambie Mine heap leach pad using naturally-occurring bacteria. With the assistance of that organisation, Nagambie Resources has now successfully applied for an initial federal grant of $50,000 for the bacterial testwork program.
The North East Link Project (NELP) tender closed as scheduled in May 2020, with Nagambie Resources asked to provide pricing for "Underwater Storage" PASS Management, but Covid-19 delays have meant that the winning tenderer for the construction of NELP has not yet been announced. The Company now considers that the Victorian Government will announce the result of the tender in the March quarter.
COMMENTARY
Nagambie Resources' Chairman, Mike Trumbull said: "2021 is promising to be an exciting year for Nagambie Resources with several of our projects, particularly gold exploration and PASS Management, finally showing real impetus.
"We have continued to investigate new opportunities during 2020 and will continue to keep shareholders informed of significant developments as they materialise."
NAGAMBIE RESOURCESExploration for Fosterville-style, structural-controlled, high grade sulphide-gold underground deposits within 3,600 sq km of Waranga Domain tenements is being methodically carried out using geophysical targeting techniques, diamond drilling and analysis for hydrothermal alteration of the sediments.
Underwater storage of sulphidic excavation material (WASS / PASS) in the two legacy gold pits at the Nagambie Mine is an excellent environmental fit with a major infrastructure project for Melbourne such as the North-East Link.
Recycling of the tailings and overburden dumps can produce aggregates for concrete and gravel products respectively.
Quarrying and screening of sand deposits at the mine to produce various sand and quartz aggregate products is also planned.
Recovery of residual gold from the 1990s heap leach pad using naturally-occurring bacteria is being investigated.
SHARES ON ISSUE 499,932,346
ASX CODE: NAG
Nagambie Resources Limited
ABN 42 111 587 163
Registered, Operations &
Head Office
533 Zanelli Road Nagambie Vic 3608
(PO Box 339) Tel: (03) 5794 1750
www.nagambieresources.com.auinfo@nagambieresources.com.au
Board
Mike Trumbull (Exec Chairman)
Gary Davison (Director)
Alfonso Grillo (Dir/Company Sec)
James Earle CEO
NAGAMBIE RESOURCES LIMITED
December 2020 Quarterly Report - 29 January 2021
GOLD EXPLORATION
Nagambie West Diamond Drilling Program - NWD001 and NAD004 Diamond Drill Holes
Summary
The East Pit at the Nagambie Mine and the Wandean Prospect, 9 km to the north west, are the only significant outcrop of the gold-bearing basement rocks in the immediate area with surface unconsolidated Murray Basin sediments (clays, sands and aggregates) occurring elsewhere, up to 100m or more in thickness. Nagambie Resources has been trialling Induced Polarisation (IP) survey techniques in an attempt to "see through" the Murray Basin sediments.
The location of the sulphide-gold feeder zone for the Nagambie Mine is becoming clearer with the drilling of the NWD001 and RAD004 diamond holes. The feeder zone appears to be immediately to the west of the West Pit and it is anticipated that the results for a just-completed RAD004 Radial-DTH IP (Radial-Down-the-Hole Induced Polarisation) survey will support this view.
NWD001 Diamond Hole
Drilling of NWD001, the first deep diamond hole to the west of the Nagambie Mine (refer Figure 1) commenced late in the September quarter and was completed in the December quarter.
Disseminated gold at both the Nagambie Mine and the Wandean Prospect occurs preferentially in east-west-striking, marine-formation, sandstone-rich brittle beds in the footwall (to the south) of east-west-striking, steeply-north-dipping thrust faults. The widespread folding of the beds due to the north-south compression event that occurred in the Waranga Domain at the time of mineralisation (circa 475 Ma) resulted in the fracturing of the sandstone-rich beds at and near to east-west-striking anticlinal folds.
Figure 1 Plan View of Nagambie Mine showing Deformation of Bedding from East-West Strike
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NAGAMBIE RESOURCES LIMITED
December 2020 Quarterly Report - 29 January 2021
The bedding strike throughout the NWD001 hole is north-east to north-north-east (refer Figure 1) rather than the preferential east-west strike that occurs in both the West and East Pits at the Nagambie Mine. The deformation is more pronounced than the east-west to north-east bedding strikes observed in the NND001 and NND002 diamond holes to the east.
Photo 1
Sedimentary Pyrite Development in Shales in NWD001 Diamond CorePhoto 2
Hydrothermal Pyrite in NAD004 Diamond Core with Vuggy Quartz/Carbonate Veining
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NAGAMBIE RESOURCES LIMITED
December 2020 Quarterly Report - 29 January 2021
NWD001 was designed to test a dipole-dipole ground IP chargeability anomaly (refer Figure 1). Logging of the core indicates that the IP anomaly relates to sedimentary pyrite development in shales (refer Photo 1). No significant hydrothermal pyrite was observed in NWD001.
The fact that this test of a hydrothermal sulphide-gold IP anomaly on trend westwards from the Nagambie Mine returned a "false positive" result (marine sedimentary pyrite not crustal-sourced hydrothermal pyrite) illustrates the difficulties in attempting to "see through" the Murray Basin sediments, the focus of Nagambie Resources' R&D program.
Both Perseverance in the 1990s and Nagambie Resources have drilled on trend to the east of the East Pit without intersecting any significant gold and various IP surveys by Nagambie Resources have failed to indicate any sulphide-gold targets to the east. The IP surveys by Nagambie Resources have also failed to indicate any significant sulphide-gold targets beneath the oxide-gold East and West Pits.
NAD004 Diamond Hole
Given the non-preferred bedding strikes in NWD001, the decision was made to drill NAD004 only approximately 120m west of the West Pit (refer Figure 1), with a view to then being able to track the preferred east-west bedding strike westwards with follow up holes.
NAD004, drilled north-south, was commenced during the quarter and is currently 400m down hole, all drilled at 60 degrees below horizontal. Detailed logging of the hole has not yet been carried out but initial inspection of the core trays indicates the bedding strikes are generally east-west with zones of hydrothermal pyrite +/- arsenopyrite and stibnite associated with vuggy quartz/carbonate veining (refer Photo 2).
IP Surveys
With the South Australia / Victoria border open again, preparations were made late in the quarter for Adelaide-based-Zonge to carry out two lines of dipole-dipole ground IP to the west of the Nagambie Bypass Freeway and a NAD004 Radial-DTH IP survey.
Zonge has just completed these IP surveys and results are awaited.
Redcastle Joint Venture (Currently Mawson Gold 50%, Nagambie Resources 50%)
As previously announced, Mawson Gold Limited (TSX: MAW), which has the option to spend a total $1.0 million to earn a 70% interest in the Redcastle JV Property (refer Figure 2), has already spent over $0.5 million to earn 50%.
Mawson Gold is undertaking a twofold approach at Redcastle. Initially Mawson is systematically collecting "tenement scale" data to understand the broad mineral system and allow it to also explore beneath the significant alluvial cover. This includes ground magnetics, gravity and gradient array IP to test the entire Redcastle mineralizing system plus Mawson has also flown a LiDAR survey over the entire project. Secondly, Mawson has completed stage one diamond drilling to test beneath the high-grade old mines. The combination of the stage one drilling data with the "tenement scale" data (geophysics, geological reconnaissance and detailed analysis of historic mine records) will aid in the development of new drill targets.
15 holes (MDDRE001-015) for 2,774.8 m have now been drilled at the Redcastle JV Property. First results will be released shortly. This drill program at Redcastle was completed immediately prior to Christmas 2020 and the drill rig has moved to the Doctors Gully prospect in the Whroo JV Property.
The next step at Redcastle is to interpret the IP gradient array, gravity, ground magnetic surveys and LiDAR survey together with the first pass stratigraphic drilling at Redcastle.
Whroo Joint Venture (Currently Nagambie Resources 100%)
The Whroo JV Property (refer Figure 2) starts to the north of Nagambie Resources' Wandean oxide-gold mineralisation and runs northwards to the historic gold mines at Whroo (including the Balaclava Mine) and White Hills (including Doctors Gully). These northern mines are located in a roughly-east-west trend of several Whroo anticlines and thrust faults. The northern Balaclava and Doctors Gully Thrust Faults can be compared to the east-west-striking Nagambie Mine, Racecourse, Wandean and Wandean North Thrust Faults to the south.
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