Legend

 

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The Company’s base metal project is located in Arnhem Land and comprises granted tenements EL26206 and EL30051.  EL30051 was granted during the June 2014 quarter. 

In 2013 a ground gravity survey was completed over an area defined by surface mineralisation with rock chips reporting >3% zinc. The gravity survey identified a 0.8 milligal Residual Gravity that is spatially associated with the mineralised area.  Preliminary modelling of the gravity data indicates the potential source to be within the upper 150m.  Review of historical sampling data has further supported the target as a mineralised body and identified new target areas within the region.

 

Gravity Modelling

Manual slope methods were applied to the gravity data, which estimated the depth to the source of the anomaly as between 100m and 150m below surface.  Gravity modelling software was subsequently used to model the response due to a rectangular prism over a portion of the anomaly at the depth determined using manual slope methods.  The model parameters used are similar to other carbonate-hosted base metal deposits and whilst there are an infinite number of models that can produce a similar response the model was found to correlate well with the actual data.  The Company is confident the source producing the gravity anomaly is within the upper 150m and is amenable to reverse circulation drilling. 

 

New Target Areas

The Company’s residual gravity anomaly is associated with an area defined by surface rock chip mineralisation.  Previous explorers collected conventional soil samples and rock chip samples over this area but did not encounter mineralisation identified by the Company’s geologist. Conventional soil samples exhibit no response over the mineralised area but do show a response down slope form the mineralised area.

This is possibly due to the topography and sampling medium forming a down slope trap for the zinc in soil samples.  Previous explorers drill tested the down slope zinc soil anomaly, which returned sub-economic mineralisation. 

This observation of surface mineralisation and an associated down slope soil anomaly is considered significant given that additional zinc soil anomalies were defined by previous explorers within the Company’s tenements.  Carbonate-hosted zinc deposits typically occur in extensive districts often covering several thousand square kilometres and the Company considers these additional soil anomalies as high priority targets that could host additional mineralised areas.

Proposed Work Program

The Company intends to drill test the ground gravity target following receipt of all necessary approvals.  An Aboriginal Areas Protection Authority Certificate is required and a Mining Management Plan approved with the Department of Mines and Energy.  The Company is working towards obtaining the approvals as soon as possible. 

The new target areas require geological mapping and rock chip sampling as a first pass assessment to prioritise areas for potential ground gravity surveys.  This work is anticipated to occur during the dry season.

REGIONAL EXPLORATION

The majority of the Company’s exploration licences are held under application and are located on Aboriginal Land.  These licences are at various stages of progression through the Aboriginal Land Rights Act.  Through an ongoing review of historical exploration reports and publically available geoscientific data the Company continues to identify those licences considered to be of higher prospectivity.  These include several licences in north-eastern Arnhem Land, which fall within an area described by the Northern Territory Geological Survey in 2013 as the ‘hottest untested exploration play in the NT’.  Significant potential exists in this area for various styles of sediment hosted base-metal deposits particularly in the northern part of the basin, which is a direct analogue of the Pb-Zn endowed Batten Trough and is effectively unexplored. The licences are also considered prospective for gold, uranium and other commodities making them highly attractive and a valuable Company asset. 

The Company holds several licences located in western Arnhem Land closer to the East Alligator River uranium deposits (Ranger, Jabiluka, Koongarra, and Nabarlek).  These licences contain historic uranium mineralisation and are considered prospective for unconformity-type uranium deposits near the base of the Kombolgie Sandstone. 

Negotiations are continuing with the Northern Land Council to prioritise upcoming land access meetings or allow early ground access to these areas through Preliminary Exploration agreements. These agreements allow non-ground disturbing exploration including mapping, rock chip and soil sampling, and ground geophysical surveys.

 

 

 

 

The above technical information has been reviewed and approved by Dr D S Tyrwhitt who is a Fellow of the Australasian Institute of Mining and Metallurgy and has 50 years experience in the industry and has more than 5 years experience which is relevant to the style of mineralisation being reported upon to qualify as a Competent Person as defined in the 2004 Edition of the “Australasian Code of Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Dr Tyrwhitt consents to the inclusion in the report of the matters based on the information in the form and context to which it appears.

 

© 2013 Top End Minerals. All rights reserved.

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